Hp P6000 Continuous Access Software Manuel d'utilisateur Page 268

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Path B - Failover only. Controller B presents the virtual disk to hosts when both controllers are
simultaneously started.
Path B - Failover/failback. Controller B presents the virtual disk to hosts, but if controller B
fails, control of the virtual disk is transferred to controller A, then transferred back to controller
B when it is available again.
Presentation (to host)
Presentation of a virtual disk to a host makes the virtual disk visible to the host and allows the host
to perform I/O with it. After a virtual disk is presented to an enabled host, the replication manager
can identify the presented virtual disk as a host volume.
CAUTION: Presenting a virtual disk to more than one host at a time, or multiple times to the same
host, can cause I/O write conflicts on the disk and the possible loss of host application data.
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 on unavailable member 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.
Virtual disks
All virtual disks that contain the 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.
268 Virtual disks
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