Using Dc-Management With Replication; Dc-Management Faq - HP 418800-B21 - StorageWorks Modular Smart Array 70 Storage Enclosure User Manual

example, assume you manually extend a host volume on which a shrink policy has been set. The manual
extend will be implemented, but the larger size of the host volume may cause the shrink policy to be
triggered at the next refresh cycle, causing the size of the host volume to be reduced.

Using DC-Management with replication

Guidelines for using DC-Management with HP Business Copy EVA
• You cannot use DC-Management with snapshots or mirrorclones created using HP Business Copy
EVA. You cannot use DC-Management on the source or the replica.
• You can resize a snapclone once normalization is complete. During normalization, you cannot
use DC-Management on a snapclone.
• If you set a dynamic policy on a host volume and then create a snapshot or mirrorclone on the
underlying virtual disk, the policy will not be executed properly. When the policy threshold is
reached, the policy will trigger and the associated job will be created. However, the job will fail
with a message indicating the resize cannot be performed because a replica exists on the virtual
disk. You should disable or remove the policy to prevent it from running.
Guidelines for using DC-Management with HP Continuous Access EVA
• When the source virtual disk of a DR pair is extended using DC-Management, the size of the
destination virtual disk is increased automatically. If the destination array does not have enough
capacity to increase the size of the virtual disk, the attempt to extend the source virtual disk fails.
The automatic increase of the destination virtual disk does not require a DCM license on the
destination array. The increase is enabled by the CA license.
• RSM checks for a DCM license on the source array only. If the destination array does not have a
DCM license, it will stop working after a fail over.
• You cannot shrink a source or destination DR group member.
• You cannot extend a DR group destination.
• You cannot extend a source virtual disk if the DR link is suspended.
• Resizing is not supported when the destination is unavailable.
• You can expand the size of a DR group member (virtual disk) whether the DR group is in
synchronous or asynchronous mode. However, there are certain considerations for expansion in
enhanced asynchronous mode (between arrays running controller software 6.0x or later).
If you expand a virtual disk while in enhanced asynchronous mode, the DR group log is not
resized to reflect the expanded virtual disk. If the expansion is small, the log may be able to
accommodate it. If the expansion is substantial, the log may not be large enough to handle it.
Expand a DR group member only when the DR group is in synchronous mode as follows:
1.
Change the write mode from asynchronous to synchronous.
2. Complete the expansion of the DR group member.
3. If you previously set the maximum size of the DR group log, change the size of the log to
accommodate the expanded DR group member. If the log size was previously determined by the
controller software, no user action is necessary.
4. Change the write mode to asynchronous.
The DR group log size is adjusted to accommodate the expanded DR group member.

DC-Management FAQ

• Can I extend or shrink any host volume?
No. DC-Management is not supported on all host agents. See
• Will extending or shrinking a host volume impact host I/O to the array?
Using DC-Management automatic policies, you can extend or shrink a host volume at any time
without disrupting host I/O.
• Can I use DC-Management with HP Continuous Access EVA?
Yes. See Using DC-Management with replication
DC-Management
for more information.
HP StorageWorks Replication Solutions Manager 4.0.1
support.
157