HP Serveur lame HP ProLiant BL465c Gen8 - Manual (Page 78)

• The following is a guideline for determining the time required for seed processing:
Seed processing time per storage group (seconds) = capacity-of-database-subject-to-seed-processing
(MB)/25 (MB/second)
For the above formula to be applicable, the following conditions must be satisfied:
• The network used for seed processing is a Gigabit Ethernet.
• The server used for seed processing has sufficient performance (such as CPU and disk perform-
ance) to adequately run the installed applications (such as Application Agent, Exchange
Server, and tape backup management softwares).
SCR configuration
• If you use the SCR seed function, the same version of Application Agent as the source must be
installed on all targets.
• If you use the SCR seed function, the EXG_SCR_SEED parameter value must be set to ON in the
Exchange environment configuration file that is specified in the -ef option of the restore command.
• If you use the SCR seed function, the Protection Manager service must be active on all targets.
• SCR is not supported in a cascade configuration.
• If you perform a point-in-time restore without using the SCR seed function, the replication function
to be restored will be stopped, but seeding or replication will not be restarted. After the restoration,
manually perform seed processing.
• To perform a backup for a database in an SCR configuration, the following conditions must be
satisfied:
• The source Microsoft Exchange Replication Service must be running.
• For storage groups in which SCR is enabled, replication statuses of all targets are
Healthy .
• A storage group that has been specified as the source can be backed up or restored by using
VSS.
• The guideline for determining the time required for SCR seed processing is described below.
For the formula shown below to be applicable, the following conditions must be satisfied:
• Gigabit Ethernet is employed for the network that is used for seed processing.
• The CPU and disks have sufficient performance.
Note that depending on CPU or disk performance, the actual processing time might be shorter
than the result calculated by the following formula. The calculation result should be used for
estimation, and it does not guarantee the product performance.
Seed processing time per storage group (seconds) = capacity-of-database-subject-to-seed-pro-
cessing (MB) * the-number-of-targets / 25 (MB/second)
DAG configuration
The following conditions must be satisfied when backing up the database in a DAG configuration:
• To back up the active mailbox database copy, see “ Using VSS ” on page 70.
• To back up the passive mailbox database copy, the conditions below must be satisfied in addition
to the conditions in “
Using VSS ” on page 70. If any of the conditions are not satisfied, a message
indicating an error is displayed and you cannot perform backup.
• The active mailbox database copy must be mounted for the passive mailbox database copy
that is to be backed up.
• Microsoft Replication Service must be running on the Exchange Server that performs the backup.
Application Agent system configurations 78