HP StorageWorks P9000 Replication Manager Software 7.1 CLI User Guide (TB584-96026, May 2011)

• 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 apply when backing up the database in a DAG configuration:
• To back up the active mailbox database copy, see “Using VSS” on page 91.
• To back up the passive mailbox database copy, the conditions below must be satisfied in addition
to the conditions in “Using VSS” on page 91. 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.
• For Information Stores for which DAGs are enabled, the replication status of each passive
mailbox database copy to be backed up must be Healthy.
• For a mailbox database copy, you cannot back up both the active mailbox database copy and
the passive mailbox database copy at the same time. Wait until the backup command executed
for one mailbox database copy is finished before executing the backup command for the other
mailbox database copy.
• To restore the backup data, the mailbox database copy to be restored must be in the active status.
If it is not in the active status, a message indicating an error is displayed.
• Backup data can be restored only by the Exchange Server that backed up the data. An Exchange
Server cannot restore backup data that was obtained by a different Exchange Server.
• Correct execution of the replication function after restoration requires seed processing. If you do
not perform seed processing, the replication function will not return to normal.
• If you use the seed function in a DAG configuration, for the -ef option, you need to specify an
Exchange environment configuration file in which the EXG_DAG_SEED parameter value is set to
ON. If the Exchange environment configuration file does not have this setting (for example, the first
priority is finishing a restoration or deferring seed processing), seed processing will not be executed.
• If you perform a restore operation without using the seed function in a DAG configuration, the
replication function for the object to be restored stops, and seed processing is not executed. After
the restore operation finishes, you will need to manually start seed processing and the replication
function.
• If you want to perform a roll-forward restore operation in a configuration in which mailbox database
copies on both the active side and the passive side are backed up, specify the option for deleting
transaction logs only for the active side or only for the passive side. This is because if an option
for deleting transaction logs is executed, the transaction log information for other mailbox database
copies will be also deleted. We recommend that you specify the option for deleting transaction
logs only for the active side or only for the passive side to prevent all of the transaction logs from
being deleted and to improve redundancy.
• When you perform a restore operation, the Microsoft Exchange Replication service must be running
on an Exchange Server that is operating as the primary active manager.
CLI User Guide 99