HP P6000 Continuous Access Software - Manual (Page 91)

Remote replication guidelines
Storage arrays
•
Source and destination arrays must have remote replication licenses. See Replication licenses
overview .
•
The array selected for the destination DR group depends on the remote replication configuration.
For supported configurations, see the HP P6000 Continuous Access Implementation Guide.
•
A storage array can have DR group relationships with up to two other storage arrays.
•
The maximum number of virtual disks in a DR group and the maximum number of DR groups
per array vary with controller software versions. See
Controller software features - remote
replication .
DR groups and failover
•
Failover of a DR group pair is permitted only by specifying a destination DR group.
•
When failsafe mode is enabled, a DR group pair cannot be suspended. See Failsafe on
unavailable member and Suspend on failover .
•
When a DR group pair is suspended, it cannot be failed over or reverted to home.
•
A DR group cannot be deleted if a virtual disk in the destination DR group is presented.
•
For additional help on usage, see Using DR groups .
Log disks
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Logs disks for the source and destination DR groups should be kept the same size.
•
The log size cannot be changed when in enhanced asynchronous write mode. See Write
mode .
Write mode
•
The write mode cannot be changed if the source log disk is in use or contains data. Before
changing, a non-empty source log disk must be merged to its destination.
•
If a source and destination array are not running the same implementation of write mode
(basic or enhanced), only synchronous write mode can be selected.
Virtual disks
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All virtual disks that contain data for an application must be in the same DR group.
•
When in enhanced asynchronous write mode, virtual disks cannot be added to or deleted
from a DR group. This restriction is controller software version dependent. See
Controller
software features - remote replication .
•
When suspended, virtual disks cannot be removed from the source or destination DR group.
•
Virtual disks cannot be directly added to a destination DR group.
•
To be added to a source DR group, a virtual disk:
Cannot be a member of another DR group ◦
◦ Cannot be a snapshot or a mirrorclone. see virtual disks Types
◦ Cannot have a mirrorclone; this restriction is controller software version dependent, see
Controller software features - remote replication .
◦ Must be in a normal operational state, see resources Operational states
DR group concepts 91