0.000, 001 seconds, or microseconds. When referring to Query and Insertion (Q&I) Time, µs means microseconds.


active file

In GxTail, the file currently visible.

active media

The currently-assigned media within each media group to which data is written during a backup. In the CommCell Console, this media's status is listed as Active.

Activity Control

A feature that enables or disables operations at the various levels in the CommCell hierarchy.

age out

The operation of removing data from an active storage area when it is no longer needed there. Aging out is a process that removes the files least-recently created or modified.


A software module in the system that performs data protection operations.


See data aging.

alternate data path

One or more data paths (see data path) that have been added to a storage policy copy for the purpose of load balancing (round robin) or failover when resources for other data paths are either offline or busy.

appendable media

Media with available space for writing data.

application-aware backup

A backup performed using the Virtual Server Agent (VSA), to capture the state of application data at the time of the backup, including data in memory and pending transactions. An application-aware backup makes it easier to restore the application for continued use. The backup for a virtual machine quiesces the application, flushes its memory, and completes pending writes, then creates a software snapshot of application data. After the software snapshot is created, the application resumes.

The VSA backup can be a streaming backup or IntelliSnap backup, but the associated application backup is always performed using IntelliSnap.

application size

The size of the data that needs to be backed up from a client computer. Application size is not always identical to the size reported by file or database management tools.

archive file

Contains data from a single backup of a single subclient.

assigned media pool

A logical repository for all used media in the library. The Assigned media pool can be located inside or outside of the library.


Users/user groups plus a role plus entities make a security association. The users or user groups are controlled by the permissions in the role when they work with the entity.

authoritative restore

An active directory restore that causes restored data to be authoritative in relation to its replication partners. Once the data is restored, it is propagated to other domain controllers and overwrites any newer data on those computers.

automatic update

A feature that is used to download and install the necessary updates to the computers under CommCell management.

auxiliary copy operation

Copies the backup data that was created on a primary copy to all auxiliary copies within the storage policy.


backup cycle

The data backed up by the most recent full or synthetic full backup job, plus any dependent incremental or differential backup jobs.

backup filters

A feature used to exclude specified data from a backup.

backup series

All of the archive files on a given backup media originating from the same subclient.

backup set

A logical grouping of subclients that define the data backed up by the agent. For more information, see Backup Sets Overview.

backup size

Size of data after compression (if enabled) and before deduplication.


For CDR (Continuous Data Replicator), the initial transfer of data from the source to the destination.

basic retention rule

A feature used to define the retention rules for data in days and cycles. See also extended retention rules.

blackout window

A period of time during which operations do not run.

Formerly referred to as "operation window".

blind library

A tape library that does not have a barcode reader. See also sighted library.


In GxTail, bookmarking is a way of flagging messages to make moving between relevant messages easy.



A set of data collected in Compliance Search using the Case Manager feature.


A copy of a database, such as a Commvault index, taken at a point in time when the database is known to be good, against which logs can be subsequently applied in order to recover the database to a point in time after the checkpoint was created.


The act of producing and backing up a checkpointed copy of a database.


A chunk is the unit of data that the MediaAgent software uses to store data on media. The default chunk size depends upon the type of backup data and the type of Media.

cleaning media pool

A logical repository for cleaning media in the library.


Deleting the content of an area of storage to reclaim space.

client compression

A feature that compresses data on a client computer before sending the data to backup media.

client computers

A computer registered for management in a CommCell environment.

client computer groups

A logical grouping of client computers in which selected options can apply to all member clients.

client owner

A user who is assigned to a client computer so permissions can be assigned to that user. See Owner Security Overview. A client may have many owners, and a user can be owner of many clients.


A virtual replica of a client computer, created from its backup.

Cloud Storage

A feature that allows you to configure and use online storage devices for data storage and recovery.

collect file

A file that records the path and name of each scanned file that is to be backed up or archived.

CommCell administration

A user group capability that permits members of the user group to administer a CommCell environment.

CommCell administrator

The person who has overall responsibility for the operation and maintenance of a CommCell environment.

CommCell Browser

The window in the CommCell Console that displays all of the objects in the CommCell environment in a tree structure.

CommCell Console

The graphical user interface used to access and manage the system.

CommCell environment

The basic organizational unit of a data management system. A CommCell environment contains one CommServe server, a MediaAgent, and at least one client.

CommCell export job

Part of the CommCell Migration and Global Repository Cell (GRC) processes. In CommCell Migration, the CommCell export job moves CommCell metadata and configurations to a destination computer. Items included in a migration are defined in CommCell Migration - Migration Considerations. In GRC, CommCell export jobs are used to synchronize metadata amongst PodCells. For more information, see Global Repository Cell (GRC) - Overview.

CommCell group

A group of CommCell environments.

CommCell import job

Part of the CommCell Migration and Global Repository Cell (GRC) processes. In CommCell Migration, the CommCell import job accepts CommCell metadata and configurations from a source CommServe computer. Items included in a migration are defined in CommCell Migration - Migration Considerations. In GRC, CommCell import jobs are used to synchronize metadata amongst PodCells. For more information, see Global Repository Cell (GRC) - Overview.

CommCell migration

The feature that allows you to migrate metadata records of MediaAgents, clients, and supported entities from one CommCell environment to another CommCell environment.

CommCell survey

An automatic reporting service that collects information about the CommCell environment, such as overall wellness of the managed components, license usage, and job statistics, and uploads it to the secure cloud site for customer service monitoring. This service is enabled through the Diagnostics and Usage dialog box, found on the Control Panel.

CommCell user

Any user who is able to protect and recover data, and perform administration operations using the system.

CommCell user group

A logical entity that serves as containers to which capabilities, CommCell objects, and users are assigned.

Common Technology Engine

Consists of the CommServe server and the MediaAgent software modules that provide the necessary tools to manage and administer the Client Agents and also manage the storage media associated with the CommCell environment.

CommServe database engine

A SQL server database that is used by the CommServe server that contains all of the information related to the CommCell environment. See System Requirements - CommServe for specifications for the CommServe database engine.

CommServe hosted databases

SQL Server databases installed on the CommServe host. The commonly installed databases are:

  • CommServe database
  • DM2 (Web Server database)
  • WFEngine (Workflow Engine database)
  • CVCloud (Enterprise Metrics Reporting Server database)

CommServe server

The software module that communicates with all clients and MediaAgents, and coordinates operations (data protection, data recovery, and administration operations, job management, event management, and so on) within a CommCell environment. There is only one CommServe server per CommCell environment.

compliance archiving

An operation that moves data from a Journaling Mailbox on the client computer to secondary storage media for the purpose of complying with legal or business regulations.


See data compression.

content indexing

A feature used to search archived data of supported file and message types by their content.


ContentStore is a virtual repository of managed data, no matter where that data physically resides. Any data that Commvault software has discovered, whether by means of data protection or by scanning live data in the enterprise, is considered to be in ContentStore.

ContentStore Email Viewer

A feature of the Outlook Add-In software that enables you to view email data that has been archived and content indexed directly from Outlook.


In Case Manager, a user who owns the data that is being collected as part of a case.

custom calendars

A calendar that can be custom defined and used for schedules, data aging, and auxiliary copy operations in a CommCell environment.


In GxTail, customization is changing aspects of the way GxTail looks and the way its functions work.


CVBF is a block-filter driver installed with the UNIX File System Agent. CXBF, also called QSnap, is also a block-filter driver installed as a separate component. CXBF (QSnap) can be used to handle backup of locked files. CXBF or CVBF provide snapshot functionality and can be used for block-level backup. CXBF is required for block-level backup on platforms where CVBF is not supported.



An Auxiliary Copy operation uses the DASH (Deduplication Accelerate Streaming Hash) Copy, which is an option for a deduplication-enabled storage policy copy, to send only unique data to that copy. DASH Copy uses network bandwidth efficiently and minimizes the use of storage resources.

data aging

Deletion of expired data from secondary storage (based on storage policy copy retention) so the associated media can be reused.

data collection policy

A logical entity that can be used to specify how often the system must collect data automatically from each CommCell environment.

data compression

A method that reduces the amount of space needed for storing data. See also client compression and hardware compression.

data encryption

The software uses asymmetrical encryption. The plain text is encrypted with one key (called public), and can be decrypted only with the other key (called private). The software uses public key encryption to avoid prompting for a pass-phrase each time a backup runs.

data integrity validation

Data integrity validation allows you to verify the integrity of the data that was secured by data protection operations.

Data Loss Prevention (DLP)

A feature that protects data on laptops by enabling file-level authentication and secure erase options in the event that a laptop is lost or stolen.

data multiplexing

A feature that allows data from multiple clients and subclients to be written to the same drive or media when a set of data protection operations are running concurrently.

data path

The path data moves between a MediaAgent and the storage media. For a disk library, a data path is defined as a MediaAgent and library. For a tape library, a data path is defined as a MediaAgent, library, drive pool and scratch media pool. Data paths are classified as regular storage or silo storage depending on their usage.

data replication

Data replication enables you to create secondary copies of production data by using a combination of host-based replication and snapshot technologies. These real-time data replication copies can be accessed immediately for fast recovery, used to create multiple recovery points, or used to perform traditional backups without having an impact on server performance.

data stream

A data channel through which client data flows to a backup media.

data verification

A feature that checks the stored data to see that it is valid for recovery and auxiliary copy operations.

data written

New data written on media by each backup job.

database availability group (DAG) without a cluster administrative access point

A DAG configuration that does not require an IP address nor does it use a Cluster Name Object (CNO) or network name resource. In addition, the cluster information is not recorded in the DNS. Applies to Exchange 2013 SP1 and later.


A process that releases the license and cleans up entries from the CommServe database when the software uninstall process fails.

decoupled installation

When you install the Commvault software in decoupled mode, the client does not establish connections with the CommServe computer. When the installation completes, the client is not registered with the CommServe. This type of installation is useful if the user wants to preinstall the software and register the client at a later time. Decoupled installations are supported by the following installation resources:

  • Installation package created from the Download Manager
  • Custom package

deduplication database

The deduplication database (DDB) is the primary component of the deduplication process. The DDB maintains all of the signatures for a deduplicated storage policy. The DDB uses in-memory database to store the data signatures.

deduplication engine

The deduplication engine is the process that runs on the DDB MediaAgent. In case of multiple DDB partitions, each partition has its own dedicated deduplication engine. The deduplication engine manages the state and the consistency of the DDB and allocates the access to the DDB to operations like backups, Dash Copy and data aging.

deduplication of data

A data storage approach that eliminates the storage of redundant data on storage media. For example, content addressable storage (CAS) systems.

The following features enable data deduplication:

  • Deduplication allows you to store deduplicated data on disk volumes.
  • Silo storage allows you to store deduplicated data on secondary storage devices for long term retention on offsite locations.

default data path

The first data path (see data path) of a storage policy copy attempted to be used by a LAN-based subclient. If the default data path is busy or not available, alternate data paths are tried if available.

delete backup/archive data

A feature that marks data as unrecoverable.

delta backup

See incremental backup.

diagnostics and usage

See CommCell survey.

differential backup

A backup of all of the data on a subclient that has changed since the subclient's last full backup.

disaster recovery

The planning for and/or the implementation of a strategy to respond to such failures as a total infrastructure loss, or the failure of computers (CommServe server, MediaAgent, client, or application), networks, storage hardware, or media. A disaster recovery strategy typically involves the creation and maintenance of a secure disaster recovery site, and the day-to-day tasks of running regular disaster recovery backups.

disaster recovery backup

Backs up metadata and Windows registry data in two phases. In the first phase the data to a local or network path is backed up. In the second phase, the data is backed up to media by using a disaster recovery backup storage policy. This data can then be restored using the CommServe Recovery Tool.

disaster recovery backup storage policy

A storage policy that is used to store metadata to media. This metadata contains information about the CommCell database and the backed up data. In case of a system failure, disaster recovery backup data can be retrieved using this storage policy.

disk library

Configuration where a DAS (direct-attached storage), NAS (network attached storage), or SAN (storage area network) disk is configured as a library to back up data to disk.


See perimeter network.

drive pool

A logical entity used to facilitate the sharing of a library's drives between multiple MediaAgents. See also master drive pool.


Data Source Name. A name associated with a source of data, most often a database, used for connecting to that source.


Edge Drive

A cloud-based storage solution that allows end-users to access files from either the Web Console, their laptops, or the CommVault Edge mobile application.


See data encryption.

End-User Erase

A feature used by owners of backed-up data for erasing data from backup media, such as when they have exceeded their quota.


A logical or physical component that forms part of CommCell instance, such as a client or client group, CommServe instance or MediaAgent.

Error Lookup

A function in GxTail that gives a detailed, plain-language description of error messages that the software can return. It includes the ability to look up error codes in many operating systems (such as Windows, UNIX and Solaris), as well as Commvault error codes.

Event Viewer

The window in the CommCell Console that displays the events that are associated with all of the activities in the CommCell environment.

exportable media

Media that can be exported because it is not required for an auxiliary copy operation or it has not been prevented from being exported by the user.

exported media pool

A logical repository for all exported media in the library.


An extent is a contiguous set of data blocks on a storage device.

extended retention rules

A feature used to define an extended retention time and days exceeding basic retention rules. See also basic retention rules.


fan-in replication

Replication of data from multiple sources to a single destination.

fan-out replication

Replication of data from one source to a multiple destinations.

feature release

A collection of new features, enhancements to existing features, and enhancements for product stabilization. Each feature release also contains a cumulative set of hotfixes that were released after the previous feature release version. Feature releases are available in a 90-day cycle.

Note: The term "feature release" is applicable only to Feature Release 19 and newer feature releases. The term "service pack" was used in Service Pack 18 and older service packs.

file system snapshots

A built-in feature of the Unix operating system that can be used to create point-in-time snapshots of volumes.


In GxTail, filtering controls which messages are visible in the log window by applying to log message text a simple string or complex regular expression that you define. You can specify the text to include in or to exclude from a given message.

filter storage policy

The storage policy used when backing up the erased-object index that is used to filter erased objects from the results returned for browse and restore operations.

floating CommServe host name

A floating CommServe host name is a virtual host name that is used by all clients and MediaAgents to communicate to the active CommServe host. The floating CommServe host name must be resolvable to the active CommServe host at all times.

foreign media pool

A logical repository for media used by other applications and CommCell environments. This media pool is can be used to manage such media using Vault Tracker.

front-end terabyte (FET)

FET is the amount of data in the largest backup job from the most recent full backup cycle.

full backup

A backup of all of the data on a subclient. A full backup provides the baseline for subsequent incremental and differential backups. (Known as a level 0 backup in Oracle.)


global filters

A feature that allows the definition of files/folder exclusions for data protection operations and attaches them to any number of subclients within the CommCell environment.

Global Repository Cell (GRC)

The Global Repository Cell (GRC) is a CommCell system that is configured as a repository. The GRC monitors the metadata of jobs from CommCell systems called PodCells.


See alternate data path.


A tool for troubleshooting Commvault jobs by analyzing log file contents. See GxTail: Overview.


hardware compression

A feature that uses the compression facility in the hardware devices (library/drive) to compress the data before it is stored on the backup media.


The computer that one or more software components are installed on, such the CommServe host, which runs the CommServe software.

hotfix pack

A collection of updates that are targeted at resolving specific critical issues that might cause major disruptions to operations. A new hotfix pack is available every week.

Note: The term "hotfix pack" is used in Service Pack 18 and older service packs. The term "maintenance release" is applicable to Feature Release 19 and newer feature releases.


identity provider (IdP)

An identity provider stores the user credentials that are needed to log on to a resource owned by the service provider (SP). When a resource owned by the SP is requested, the user is authenticated with the identity provider.

in-place restore

An operation in which data is restored to the original location (that is, the same computer and path) from which it was backed up. See also out-of-place restore.

incremental backup

A backup of all of the data from a subclient that has changed since the subclient's last full, incremental, or differential backup.


A database containing the metadata for backed-up data. The index is created during the backup process and used by find, browse, restore, and other operations.

index cache

The temporary working area that the Commvault software uses while creating an index. The index files are stored in the Index Directory.

index cache folder

The former name of the Index Directory.

Index Directory

The area on local disk in a MediaAgent where index data is kept. Set on the MediaAgent Properties > Catalog dialog box.


The level in the CommCell Browser tree that represents the database that needs to be backed up. All subclients for the database are defined under an instance.

instance (File Archiver for Windows)

A File Archiver for Windows instance exists as a level in the CommCell Browser under the client and agent levels and represents the type of file system that needs to be backed up. The four types of instances include: Local File System, Celerra, Network File Share, and FPolicy. An instance is user-defined, rather than created by default after installing the agent.

instance (Network Topologies)

The Network Topologies feature provides predefined templates for some common network topologies. In this context, an instance is where one of these topologies is used to define the firewall configuration for a specific pairing of client groups.

Intelligent DataAgent (iDataAgent)

A software module that backs up and restores data of a particular application type on a host computer system.

IntelliSnap backup

A feature that enables you to create a point-in-time snapshot of the application data to be used for various data protection operations.


Job Controller

The window in the CommCell Console that can be used to monitor and manage the active jobs in the CommCell environment.

jump start server method

A full system restore method that allows the downed server to start from a jump start server (that is, the boot net command is given from the boot console).


legal hold

The process of identifying and segregating relevant documents that are found during a data discovery operation and preserving them in a physical repository for long-term retention.

legal hold set

A special type of on demand backup set that is used for legal hold purposes.


A storage unit that contains a robotic device, one or more media drives, and multiple media cartridges for extended storage capacity. Within the CommCell Console, all storage devices are referred to as libraries.

library controller

The software module that manages the hardware operations of the arm changer within a storage device (for example, mounting, unmounting, importing, and exporting media).

library type

Library types can be one of the following: tape, stand-alone tape, or disk.

liveliness check

A method of confirming network connectivity between a client and its associated MediaAgent during long operations such as backup, by exchanging messages between those two components.

list media

A feature that can be used to predict media that is required for a data recovery operation.

live data

Data that is not backed up.

Live Sync

A feature that replicates virtual machines from backup data. Live Sync creates destination VMs at one or more recovery sites from a full backup, and applies changes from ongoing incremental backups of the original source VM to keep the destination VM in sync.

logging mode

Transaction logging setting for a Domino server.


maintenance release

A collection of updates that are targeted at resolving specific critical issues that might cause major disruptions to operations. A new maintenance release is available every week.

Note: The term "maintenance release" is applicable only to Feature Release 19 and newer feature releases. The term "hotfix pack" was used in Service Pack 18 and older service packs.


In GxTail, markers highlight all occurrences of a string of text or complex regular expression that you specify, in a background and text color combination that you can set.

master CommCell environment

The CommCell environment that remote CommCell environments are registered with. After you register a remote CommCell environment with the master CommCell environment, the remote CommCell environment is displayed in the client list of the master CommCell environment.

master drive pool

A logical entity that is used to facilitate the sharing of a library's drives between multiple MediaAgents. See also drive pools.

Media by Groups

A logical grouping of removable media in the CommCell Browser. Media by Groups includes one or more of the following pools: Scratch, Cleaning Media, Retired Media, Overwrite Protect Media, Foreign Media, and Assigned Media.

Media by Location

A logical grouping by location of all removable media in the CommCell Browser. Media by Location includes Export Media and Media in Library.

Media Explorer

A tool used to view and recover data that was secured by disaster recovery backup from any media when the CommServe server is unusable or inaccessible. Media Explorer is supported only for recover CommServe server disaster recovery backup.

media prediction

See list media.

media refresh

An operation that consolidates valid data from a tape media to another media. The old tape media is recycled.


The software module that transmits data between clients and backup media. The MediaAgent manages the data that is stored on the media.

migration archiving

An operation that moves data from a client computer to secondary storage media to reduce the costs that are associated with backing up and maintaining the data on primary storage.

miniroot method

A full system restore method that requires the new root file system to be located on a different volume or partition than that of the original installation.

mount path

The location on a disk where backup data is stored. A disk library can have multiple mount paths.


See data multiplexing.


network address translation (NAT)

A method of directing network traffic coming to a gateway or proxy to and from a specific device behind the firewall based on the port number on the gateway or proxy that the traffic is coming to.

network agent

A feature that can be used to increase the data transfer throughput from a client during data protection operations.

network bandwidth throttling

A feature that can be used to control the amount of data transferred in a network during a data protection operation.

non-authoritative restore

An active directory restore that propagates newer data on the network to the restored computer, updating it with newer information.

non-preemptible jobs

A job that cannot be interrupted by the Job Manager Service or be suspended by a user. See also preemptible jobs.

notification criteria

Notification criteria determine when and at which frequency an alert is sent to a recipient. An alert can be sent immediately after a condition occurs or after the condition has persisted for a certain length of time. An alert can also be repeated if necessary.



The storage account created by an authorized CommCell user for a third-party application to store and manage the application data using ContentStore APIs (Application Programming Interface).

offline client

If the CommServe cannot connect to a client, the client is considered offline. Client connectivity is checked using the following methods:

  • The CommCell Readiness report
  • The Check Readiness task
  • A job fails because the CommServe cannot connect to the client

offline mining

The ability in which data (for example, SharePoint Documents, Exchange mail messages) can be mined from an offline database.

on demand backup set / archive set

A logical entity that allows data to be backed up or archived through a Directive File specified at the point of backup/archive. The Directive File contains the fully-qualified paths to one or more Content Files that contain the fully- qualified paths to one or more files, links, and/or devices to be backed up. For some agents, a single Content File is used in place of the Directive File.

one-pass restore

A type of restore that reads a backup tape once to gather the information and data that are necessary for a restore.

operation window

See blackout window.

orphan file

A file that is in the destination directory, but not the source directory.

orphan stub

A stub for an email message that has been archived, but which no longer exists on the backup.

Orphaned media

Logical repository of all of the assigned media that does not have any associated libraries.

out-of-place restore

Data is restored to a new location (that is, different from the original location of the backup). See also in-place restore.

Overwrite Protect media pool

A repository that can used to preserve media (or the data in the media) and prevent the media from being overwritten.



A phrase selected by the user to protect a private asymmetrical key on the CommServe environment or on media when using data encryption.

pass-phrase export files

Files with scrambled pass-phrase used to perform unattended data recovery operations of encrypted data that requires a pass-phrase.

perimeter network

The zone of a communication network that exposes networked resources deployed in a trusted network (such as servers), to access from an untrusted zone (like the public Internet). Network security-related devices (routers and proxies, for example) are logically placed into this area to control the access. Also called "DMZ".

persistent recovery

A type of stub recovery job that opens a common pipeline to recover archived data from disk media (also from tape for File Archiver for Windows). The job remains persistent to allow multiple stub recall requests to be submitted as a group, which reduces the time to open a pipeline for each stub recall request.


A distinct operational part of a job, such as the scan, backup, and archive index phases of a backup job. Because jobs consist of multiple phases, you can restart a job at the phase level instead of at the job level. Job phases provide more control over the overall job. For example, you can run a post-process after a backup phase.

placeholder client

A client that exists logically (not physically) for the purpose of creating reference copies.


When a Global Repository Cell (GRC) is configured, a PodCell is the CommCell environment that is monitored from the GRC.

Predefined Network Topologies

A feature that simplifies configuring the Commvault firewall by providing pre-defined topologies that the user can create instances of by selecting client groups from dialog-box lists.

preemptible job

A job that can be interrupted by the Job Manager Service or suspended by a user, and then restarted. See also non-preemptible jobs.

preferred data path

A LAN-free data path (see data path). Preferred data paths are available when a MediaAgent and source client agent are installed on the same host. If multiple LAN-free data paths are available, the first data path added to the storage policy copy will be the preferred data path.

Primary copy

The logical entity in a storage policy through which all data protection operations are conducted.

primary restore

Used when all domain controllers in the domain are lost and the domain is rebuilt from the backup.

primary storage

Primary storage refers to data in active use from computer hard disks and/or volumes. See also secondary storage.

priority precedence

Priority of the client computer relative to priority of the Agent.


In GxTail, profiles contain configuration information for GxTail, such as appearance and markers.


A physical computer or virtual machine on which an agent is installed to facilitate data protection and recovery operations for other machines.

Proxy Agent

An agent that is installed on a separate computer than the computer from which data is collected.



A special subdirectory of the root directory in a volume with special attributes such as security style, disk space and file limits.


A limit set by administrative staff that stops backing up data if the limit (the quota) is exceeded.



File tree operations that extend into folders from the point specified, downward.

Reference Copy

A feature that restores selected objects from backed-up data, then saves a copy of them that is separate from the backup from which they were taken. The resulting copy of the data is usually controlled by different retention criteria than the original.

remote access client

A method whereby a client computer controls the access to its services when requested by another client computer. The "remote" client can be either the one that's inside or outside of the CommCell group's private network.

remote install/upgrade

A Unix-based install/upgrade method used to install/upgrade the software on multiple Unix computers from a remote Unix computer.

replication log

Files on the source computer that log all file write activity, which are then transferred to and replayed on the destination computer.

replication log replay

The extraction of all new or changed data from the replication logs that ensures that the destination remains a real-time replica of the source.

replication log transfer

The copying of the replication log from the source to the destination.

replication pair

A logical entity that defines a data replication source and destination.

replication policy

A centralized template through which configuration of replication sets/replication pairs within a CommCell ® environment can be accomplished. A replication policy consists of a common configuration for replication set and replication pairs that can be applied to target replication set/replication pairs within the CommCell environment.

replication set

A group of replication pairs.

resource management

Resource management provides integrated data reporting and predictive capabilities to optimize storage management and usage, reduce excess storage purchasing, or deliver improved business performance.

restore by jobs

A feature that can be used to restore data associated with a specific data protection job.

restore filter

A feature used to exclude specified data from being restored.

retention period

The period of time for which a particular set of backup data has not exceeded its retention criteria. Once the retention period has elapsed and the data aging has been run, the data becomes unavailable for restores.

retired media pool

A logical repository for all retired media in the library.


In Case Manager, a Compliance Search user who is able to view, search, edit, and close a case.


A reusable group of user security permissions that determine the operations users can perform on entities.


SAML (Security Assertion Markup Language)

SAML is an XML-based open standard for creating and exchanging security information between an identity provider and a service provider.

schedule policy

A feature used to associate a schedule or groups of schedules and attach it to any number of clients/backup sets/subclients or storage policies within the CommCell environment.

scratch pool

A repository for new or pruned media that are available for use.

secondary storage

Secondary storage refers to backup or archival data moved to a storage media, such as tape media, disk volumes, and so on. See also primary storage.

selective copy

The logical entity in a storage policy used by an auxiliary copy operation to copy full backups that meet the specified criteria, from the primary copy.


In GxTail, this is merging the contents of one log file into another log file, so that the timeline across multiple files can be seen without switching back and forth between the files.

service pack

A collection of new features, enhancements to existing features, and enhancements for product stabilization. Each service pack also contains a cumulative set of hotfixes that were released after the previous service pack version. Service packs are available in a 90-day cycle.

Note: The term "service pack" is used in Service Pack 18 and older service packs. The term "feature release" is applicable to Feature Release 19 and newer feature releases.

service provider (SP)

A service provider owns a resource that a user needs, for example, the Web Console is a resource. When a resource owned by the service provider is requested, the user is authenticated with the identity provider (IdP).


See single instance database.

sighted library

A disk library that has a barcode reader. See also blind library.

silent install/upgrade

A Unix-based install/upgrade method used to enter responses to installation prompts directly into an auto-response file to install software faster and unattended.

silo storage

A feature that allows you to store deduplicated data on secondary storage devices for long-term retention at offsite locations.

single instance database (SIDB)

Another name for the deduplication database (DDB). See deduplication database.

size on media

Size of deduplicated data written on the media.


An abbreviation of Service-Level Agreement. As used in Commvault, SLA is an expected standard of data protection coverage for a client computer.  A client computer meets SLA when all of its subclients and databases are protected by at least one successful full, incremental, differential, or log backup job in a given time range, such as 30 days. SLA is reported as a percentage that indicates the number of client computers that met SLA divided by the total number of client computers.

smart resync

The seamless resumption of replication log replay after an interruption in replication activity. See also replication log replay.

snapshot (GxTail)

A collection of log files in zip format, packaged together with the GxTail context.

snapshot copy

A snapshot copy of the storage policy is an additional copy of the protected data that is used in IntelliSnap operations. The snapshot copy stores the metadata information related to the IntelliSnap feature.

Snapshot Volume Unit (SVU)

A subclient content template that contains a set of specified volumes, and defines subclient content and configuration in a way that is common to a given set of Agents.

staging cache

The temporary update cache location to which a new Service Pack is copied once it is downloaded.

stand-alone drive

Any media device consisting of a single drive unit (for example, tape drive). Storage media must be manually inserted into and removed from these devices, which generally lack media storage capability.

storage policy

A logical entity through which data from a subclient is backed up. A storage policy consists of one or more copies that associate data with a particular physical media.

storage policy copy

A logical entity that provides the path to the backup data and also provides the facility to define the retention period for the data.


In the context of a storage policy, refers to devices or device streams.

streaming backup

A direct copy of data from a client to storage media without intermediary staging (IntelliSnap) or alternate source processing (Synthetic Full). A streaming backup is sometimes referred to as a "regular backup" or a "traditional backup."


Stubs are files that point to backed up and archived data, functionally similar to a Windows shortcut, Macintosh alias or Unix symbolic link.

stub recovery

Any action that causes an open and read on an object (for example, message or file) that has been archived that starts a recovery operation (not initiated through the CommCell Console) for that object.


A logical entity that defines specific data on a client computer that will be protected (drives, folders, files, databases, mailboxes, etc.) For more information, see Subclients Overview.

subclient policy

A logical entity through which configuration of multiple file system subclients within a CommCell environment can be accomplished from a centralized template. A subclient policy consists of one or more subclient templates that contain a common configuration that is applied to target subclients within a CommCell environment.

synchronous copy

The logical entity in a storage policy used by auxiliary copy operation to copy backup data occurring on or after a selected date on the primary copy

synthetic full backup

An operation that combines the most recent full backup of the selected data with all subsequent incremental/differential backups and stores the result in a single archive file.



System-defined or user-defined custom information that can be assigned to content indexed documents or files in order to categorize them and perform a search based on the tag at a later point of time.

threshold criteria

The threshold criteria of an alert determine at which level the condition within an entity must be reached before an alert is sent. A criterion can be percentage- or value-based. For example, if the threshold criterion is percentage- based with a value of 12% for a Drives Offline alert, then when 12% or more of all the total drives within the entity go offline, an alert notification is sent to a recipient. If the same alert is value-based with a value of 1, then when one or more of all the total drives within the entity go offline, an alert notification is sent.

tracking policies

A tracking policy defines which media is moved, the location where it is moved to and the time that the media is moved.



Performs software functions allowed by its member user group based on the capabilities of the user group.

user group

A user group is a logical entity through which capabilities are assigned. A user group can administer CommCell environments.



See data verification.


Virtual Server iDataAgent, Hyper-V backup software, and VMware backup software is a single product that allows you to control all aspects of data management from a single console in virtualized environments for both Hyper-V and VMware. This includes data protection, archive, replication and reporting.

virtualization client

A management unit for each hypervisor, such as VMware, Hyper-V, and RHEV in the CommCell Console. The virtualization client provides a single point of administration for backup and restore operations on the hypervisor. For example, the virtualization client for VMware serves as a single point of administration for the entities managed by the vCenter, including ESX servers, datastores, and virtual machines (VMs).

Last modified: 1/2/2018 3:26:30 PM