This glossary contains definitions of terms used in this document.




The Advanced Encryption Standard is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology in 2001.


Agnostic, with respect to Replication Policy, means the replication procedure is independent of rack position and data center. This may also be referred to as rack unaware.


An application programming interface is a set of routines, protocols, and tools for building software and applications.


Also known as automated storage tiering, auto-tiering dynamically matches data to storage nodes based on performance needs and access patterns.


The Challenge-Handshake Authentication Protocol authenticates a user or network host to an authenticating entity.

cold data

Cold data is data that is rarely accessed and can be stored on the slowest storage in an organization.


See Hedvig Storage Proxy.


Cluster Shared Volumes is a feature of failover clustering (or HA clustering) first introduced in Windows Server 2008 R2 for use with the Hyper-V role. A CSV is a shared disk containing an NTFS or ReFS (ReFS: Windows Server 2012 R2 only) volume that is made accessible for read and write operations by all nodes within a Windows Server failover cluster.


Disaster recovery involves a set of policies and procedures to enable the recovery or continuation of vital technology infrastructure and systems following a natural or human-induced disaster.


VMware ESXi (formerly ESX) is an enterprise-class, type-1 hypervisor developed by VMware for deploying and serving virtual computers.


A hard disk drive is the traditional spinning hard drive, which provides basic nonvolatile storage on a computer.

Hedvig Block
Process (HBlock)

The Hedvig Block Process is responsible for storing the physical blocks.

Hedvig Metadata
Process (Pages)

The Hedvig Metadata Process is responsible for tracking all system metadata.

Hedvig Storage Cluster

A Hedvig Storage Cluster is an elastic cluster, formed by using any type of commodity server(s).

Hedvig Storage
Cluster Node

A Hedvig Storage Cluster Node is an individual commodity server running Hedvig Storage Service software.

Hedvig Storage

A Hedvig Storage Pool is a logical grouping of multiple physical disks that are presented as a single entity.

Hedvig Storage

A Hedvig Storage Proxy is a lightweight software component that deploys at the application tier as a virtual machine or Docker container, or on bare metal, to provide storage access to any physical host or virtual machine in the application tier. The storage proxy presents block, file, and object storage access to app hosts, accelerates read performance with flash caching, drives efficiency with deduplication, and secures data with encryption. This may also be referred to as an HSP, controller, CVM, target, or tgt.

hot data

Hot data is data that needs to be accessed frequently.


In a hyperconverged architecture, compute and storage scale together on a commodity server to form a simplified, scale-out, data center building block.


In a hyperscale architecture, compute and storage scale independently of each other.


An iSCSI qualified name is the most commonly used format for assigning iSCSI names to nodes (targets and initiators) in an iSCSI network. All IQNs follow this pattern:


iqn = literal for iSCSI Qualified Name

yyyy-mm = year and month that the naming authority took ownership of the domain name

reversed_domain_name = reversed domain name of the naming authority

storage_target_name = optional string to uniquely identify each IQN under the same domain

For example:


Internet small computer system interface is an IP-based storage networking standard for linking data storage facilities.


The Lightweight Directory Access Protocol is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an IP network.


A logical unit number is a number that identifies a logical unit, which is a device addressed by the SCSI protocol or SAN protocols, which encapsulate SCSI, such as Fibre Channel or iSCSI.


A network file system is a distributed file system protocol that allows a user on a client computer to access files over a computer network much like local storage is accessed.


Representational state transfer is the software architectural style of the World Wide Web.


Small computer system Interface is a set of standards for physically connecting and transferring data between computers and peripheral devices.


A solid-state drive (or flash or pin-to-flash) is a solid-state storage device that uses integrated circuit assemblies as memory to store data persistently.


OpenStack Object Storage (Swift) is a scalable redundant storage system.


Amazon S3 (simple storage service) is an online file storage web service.


See Hedvig Storage Proxy.


A tenant is a group of users who share a common access with specific privileges to a software instance.

virtual disk

A virtual disk is an abstracted logical disk volume presented to a computer or application for read/write use.


A virtual machine is a software computer that, like a physical computer, runs an operating system and applications.


Virtual machine file system is the clustered file system used by VMware vSphere.