HP StorageWorks XP Remote Web Console Software - Manual (Page 64)

requirements. In the following cases, delta resync operation will not be performed because
the necessary journal data does not exist when:
◦ After splitting the XP Continuous Access Journal pair, the secondary data volume of the
XP Continuous Access Journal pair associated with the secondary data volume of the XP
Continuous Access Journal pair for delta resync operation is updated.
◦ After splitting an XP Continuous Access Journal pair and as a result of the update of the
primary data volume, the capacity of the journal data exceeds 70% of the journal volume
in the XP Continuous Access Journal secondary site associated with the primary data
volume of the XP Continuous Access Journal pair for delta resync operation.
◦ The primary data volume in the XP Continuous Access Journal pair for delta resync
operation is updated and then the capacity of the journal data exceeds 70% of the journal
volume in the primary site of an XP Continuous Access Journal pair for delta resync
operation.
◦ After creating the XP Continuous Access Journal pair for delta resync operation, no volumes
(including volumes after failover or failback) in the primary site are updated. If the delta
resync operation to support remote command devices is performed, you can execute the
delta resync operation directly after the primary site is updated. Consider the following
when creating the XP Continuous Access Journal pair for delta resync operation.
– When the XP Continuous Access Journal pair status changes to HOLD after the delta
resync operation.
– When you re-create the XP Continuous Access Journal pair for delta resync operation
when recovering the primary site.
In the delta resync operation performed in the multi-target configuration combining three XP
Continuous Access Journal sites, the option that copies all the primary volume data to the secondary
volume when only a part of the differential data between the primary and the secondary data
volumes is stored in the primary journal group is disabled. For details about the option, see
“Changing Options for a Journal Group” (page 167) .
In the 3DC Multi-target configuration which consists of three Continuous Access Journal sites, Use
CCI to perform the delta resync operation. You cannot use Storage Navigator to perform the delta
resync operation.
If the status of the XP Continuous Access Journal pair for delta resync operation does not change
after you performed delta resync operation, some requirements listed in this section may not set
properly. Check the status of the XP Continuous Access Journal pair and XP Continuous Access
Journal pair for delta resync operation, and make sure that all pairs are in the required status.
If the status of the XP Continuous Access Journal pair for delta resync operation becomes HLDE,
you cannot restore the pair status to HOLD by resynchronizing the pair. Delete the XP Continuous
Access Journal pair for delta resync operation and create the XP Continuous Access Journal pair
again.
Transferring Business Tasks from the XP Continuous Access Journal Secondary to the
Primary Site
If you remove failures from the primary site, you can transfer your business tasks back to the primary
site using RAID Manager and the following procedure:
1.
If the status of the XP Continuous Access Journal pair between the target secondary site and
the primary site is suspended, use RAID Manager to resynchronize the pair to reverse the
primary and secondary volumes.
2. Stop business tasks at the target XP Continuous Access Journal secondary site.
3. Use RAID Manager to execute the pairsplit -RS command on the XP Continuous Access
Journal pair between the target secondary site and the primary site.
64 Preparing for XP Continuous Access Journal Operations