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CommServe Recovery Using High Availability CommServe Host (CommServe LiveSync)

Overview

The High Availability CommServe Host (also referred to as CommServe LiveSync) feature keeps the CommServe server ready for disaster recovery and provides the ability to quickly failover to a designated standby host in the event of a disaster.

The standby CommServe host must be setup with identical software as the production CommServe host. Microsoft SQL Server Agent is used to back up and restore the critical CommCell databases from the production CommServe host to the standby CommServe host using the CommServe LiveSync operation. This reduces the downtime needed to recover the CommServe server, as the dedicated standby CommServe host is always kept in-sync with the production CommServe host.

One or more proxy clients are used to route requests and responses between the CommServe host and all the clients in the CommCell. When a failover is performed, the proxy client routes the requests to the standby CommServe host so that the clients can seamlessly connect and continue operations with the CommServe host. In addition, one or more clients can be setup to monitor the status of the active CommServe host and generate an alert when the active CommServe host is not reachable.

Key Features

  • Quick and easy installation of the relevant software needed for setting up the High Availability CommServe Host feature on both the active and passive nodes.
  • Microsoft SQL Agent automatically installed and setup with all the configurations needed to perform the LiveSync operation used to replicate the critical databases and keep them in-sync.
  • Ability to use the feature out-of-the-box without any special configuration or modification.
  • Ability to easily customize the basic setup using either the CommCell Console or the Command Center.
  • One-click failover initiation and monitoring using the Commvault Process Manager.
  • Support for Alert framework.
  • Failover module does not rely on DNS or other network related services.

Terminology

Production CommServe Host

The primary or the currently active CommServe host.

Standby CommServe Host

The secondary or the currently passive CommServe host. More than one host can be setup as a standby.

LiveSync Operation

The automated process of backing up SQL transaction logs from the production CommServe host and restoring them in the standby CommServe host. (This process is also referred to as Log Shipping.)

CommServe client

The generic term used to refer to the client or instance hosting the CommServe server.

By default, the CommServe is installed in Instance001 on the production and standby CommServe hosts.

SQL client

The generic term used to refer to the client or instance hosting the SQL Server Agent used for the LiveSync operation.

By default, the SQL Server Agent is installed in Instance002 on the production and standby CommServe hosts.

LiveSync subclient

or

CV Failover Log Shipping subclient

The subclient which is automatically created and used exclusively by the LiveSync operation to replicate the critical databases from the production CommServe host to the standby CommServe host.

Proxy

or

Proxy Client

A client (or clients) that is used as a proxy to route requests and responses between the CommServe server and the clients in the CommCell, before and after a failover.

By default, the SQL client installed in the CommServe host is used as the proxy.

Last modified: 3/4/2019 8:49:31 PM