NetVault Plug-in for Exchange 12.0 - User Guide

Local Continuous Replication (LCR)

LCR is a single Exchange Mailbox Server solution that uses built-in asynchronous log-shipping technology to create and maintain a copy of a Storage Group on a second set of disks. This second set is connected to the same server as the production Storage Group. LCR provides log shipping, log replay, and a manual switch to a secondary copy of the data. For more information, see Exchange 2007 Local Continuous Replication at http://technet.microsoft.com/en-us/library/bb125195.aspx.

In an LCR deployment, the Plug‑in for Exchange is installed on the single Exchange Mailbox Server.

Single Copy Cluster (SCC) or Failover Cluster

SCC or Failover Cluster is a clustered solution that uses a single copy of a Storage Group on storage that is shared between the nodes in the cluster. In an SCC deployment, the Plug‑in for Exchange is aware of which node is the active node and performs backups of the Active Copy of the Storage Groups. During the restore process, data is restored to the active node. For more information regarding Exchange 2007 SCCs, see Single Copy Clusters at: http://technet.microsoft.com/en-us/library/bb125217.aspx.

In an SCC deployment, the plug-in is installed on the Exchange Virtual Server. The Exchange Virtual Server is a group of nodes and hosts that make up the cluster. The NetVault Backup Server sees the cluster as a single client, which is called a Virtual Client. When installing the Plug‑in for Exchange on the Virtual Server, the plug-in is installed on all nodes by using NetVault Backup’s Cluster Support. NetVault Backup’s Virtual Client is used to back up a single clustered resource, which in this example is the Exchange Virtual Server.

Cluster Continuous Replication (CCR)

CCR is a clustered solution that uses built-in asynchronous log shipping technology to create and maintain a copy of each Storage Group on a second server in a failover cluster. CCR is either a one or two data-center solution, providing both high availability and site resilience. According to Microsoft, CCR uses the database failure recovery functionality in Exchange 2007 to enable the continuous and asynchronous updating of a second copy of a database with the changes that have been made to the active copy. During installation of the passive node in a CCR environment, each Storage Group and its database is copied from the active node to the passive node. This operation is called seeding, and it provides a baseline of the database for replication. After the initial seeding is performed, log copying and replay are performed continuously. For more information, see Cluster Continuous Replication at http://technet.microsoft.com/en-us/library/bb124521.aspx.

In a CCR deployment, the plug-in is installed on the Exchange Virtual Server. The Exchange Virtual Server is a group of nodes and hosts that make up the cluster. The NetVault Backup Server sees the cluster as a single client, which is called a Virtual Client. When installing the Plug‑in for Exchange on the Virtual Server, the plug-in is installed on all nodes by using NetVault Backup’s Cluster Support. NetVault Backup’s Virtual Client is used to back up either the Active or Passive node, which in this example is the Exchange Virtual Server.

The Plug‑in for Exchange lets you select the Exchange Mailbox Server active node or the passive node as the source for the backups. Using the passive node for backups reduces load on the active node. During the restore process, restores are always targeted to the active node.

Installing and removing the plug-in