Creating A Group Of Physical Copies; Resynchronizing A Physical Copy; Resynchronizing A Group Of Physical Copies - HP 3PAR StoreServ 7200 2-node Administrator's Manual

Creating a Group of Physical Copies

The HP 3PAR CLI also allows for the creation of consistent group physical copies of a list of virtual
volumes. A maximum group size of 100 virtual volumes is recommended for making a group of
physical copies.
To create group physical copies, issue the creategroupvvcopy -p -s
<parent_VV>:<destination_VV>-pri high command, where:
-p <parent_VV> creates a group of snapshots of the parent volume, as identified by
<parent_VV>, and copies data from the snapshots to the destination volume.
-s saves the snapshot for quick resynchronization, and retains the parent/copy relationship
between the parent and destination volumes.
-pri <high|med|low> specifies the priority of the copy operation before it is started. This
option allows you to control the speed of the task. If this option is not specified, the operation
is started with default priority of medium. High priority indicates that the operation will complete
as fast as possible. Low priority indicates that the operation will run slower than the default
priority task. You can use the -pri option to raise the priority of the task if your virtual volumes
are unavailable and restoring access to the volume is the highest priority. However, raising
the priority of the task may impact host I/O performance. This option cannot be used with
-halt option.
The priority of the task can also be changed after it is running with the settask command.
For more information about changing the priority of a running task, see
of a Running Task" (page
<destination_VV> is the name of the destination volume. The destination volume must be
equal to or greater in size than the parent volume, must be a writeable base volume, and
must not be exported as a VLUN.
For a complete list of options available for the creategroupvvcopy command, see the HP 3PAR
Command Line Interface Reference and the HP 3PAR CLI Help.
NOTE: If you wish to copy multiple volumes, the <parent_VV>:<destination_VV> argument
can be repeated multiple times on the command line for a single instance of the
creategroupvvcopy command.
The -halt option cancels a running group copy operation. The destination volume is marked with
the cpf status, which indicates that the group copy operation failed. The cpf status can be cleared
by issuing a new instance of the creategroupvvcopy command.
The creategroupvvcopy command can be issued multiple times. However, the system allows
only two physical copy tasks to run concurrently. Any additional physical copy tasks are queued,
pending the completion of the active physical copy tasks.

Resynchronizing a Physical Copy

At some point, you may want to resynchronize a physical copy with its original base volume
because either virtual volume could have been modified since the copy operation was launched.
When you resynchronize a physical copy, the system copies changes from one volume in the
physical copy pair to the other.
To resynchronize a physical copy, issue the createvvcopy -r <destination_VV> command,
where -r <destination_VV> is the volume to be resynchronized with its parent volume. The
snapshot is retained for quick resynchronization, and the parent-copy relationship is also retained.

Resynchronizing a Group of Physical Copies

Just as groups of physical copies can be created for a list of virtual volumes, those physical copies
can also be resynchronized.
128).
"Setting the Priority
Physical Copies 99