HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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example, recover from cases where corrupted source data was replicated to the
target. By default, Storage Mirroring Recover takes periodic snapshots of the data
on the target. When failover is triggered, you can use the target data at the time of
failover or you can revert to a snapshot of the target data. Specify how you want to
handle snapshots.
● Enable periodic snapshots—By default, periodic snapshots are enabled. If
you disable snapshots, the data on the target at the time of a failure will be
used.
● Snapshot Interval—By default, snapshots of the target data are taken every
60 minutes. If desired, increase or decrease the interval between snapshots.
● Start now—If you want to start taking snapshots immediately after the full-
server connection is established, select Start now.
● Start at—If you want to start taking snapshots at a specific data and time,
select Start at and specify the date and time parameters.
3. Click OK to save the settings.
Configuring failover monitoring and processing
1. Make sure you have a valid source and target specified, click Configure
protection from the main Full-Server Failover Manager page, and then select the
Failover tab.
2. Specify how you want to handle failover monitoring and processing.
● Manual intervention required—By default, you will be notified when a
failover is necessary, but the failover process will not start until you manually
initiate it. If you disable intervention, failover will automatically start when a
failure is detected.
● Monitor Interval—By default, the target checks to see if the source is online
every five (5) seconds. The source responds back to the target when it
receives one of these checks. If desired, increase or decrease the interval
between checks.
● Missed intervals—By default, the target can miss five (5) responses from the
source beforeassuming the source has failed. If desired, increase or
decrease the number of responses that can be missed before the source is
identified as failed.
Note:
Together, the Monitor interval and Missed intervals settings determine
thetotal time before failover would be triggered. For example, five missed
checks every five seconds would be 25 seconds to trigger failover. To
achieve shorter delays before failover, use lower values. To achieve
longer delays before failover, choose higher values.