Hitachi Command Suite 8 User Guide

Tip: If there is a large disparity between the performance metrics for
the P-VOL and S-VOL, complete the wizard steps to investigate the
issue further and determine the root cause. For example, there could
be significant load variances between the connected hosts for the primary/secondary storage systems, remote path latencies, or multi-
path software configuration issues.
6. Continue stepping through the  Identify Performance Problems  wizard
to review further information on Cache, MP Blades, and Parity...

pair, and select Unallocate global-active device pair
simultaneously .
3. Click  Show Plan  and confirm that the information in the plan summary
is correct. If changes are required, click  Back.
4. (Optional) Update the task name and provide a description.
5. (Optional) Expand  Schedule to specify the task schedule.
You can schedule the task to run immediately or later. The default setting
is  Now . If the task is scheduled to run immediately, you can select  View
task status  to monitor the task after...

2.In the  Unallocate Volumes  dialog box, verify that the host is correct,
and then select the P-VOL or S-VOL of the global-active device pair to
unallocate.Note:  When unallocating the secondary volume, the primary volume is
retained as a normal volume. When unallocating the primary volume, the
secondary volume is retained as a normal volume.
3. Click  Show Plan  and confirm that the information in the plan summary
is correct. If changes are required, click  Back.
4. (Optional) Update the task name and...

• Remote path failures (Initiator/RCU Target ports) between primary andsecondary storage systems.
• External storage (quorum) path failures between the external storage system and primary/secondary storage systems, or failure of the quorum
disk, or failure of the quorum storage system.
• Primary or Secondary storage system failure. • Primary or Secondary site failure.
Failures typically cause global-active device pair status to change fromnormal (for example, PAIR status) to some combination of status...

Result
The failed path is operating again.
Related concepts •
About global-active device failures  on page 303
Related tasks
•
Editing LUN paths when exchanging a failed HBA  on page 227
Discontinuing a global-active device environment To discontinue the use of a global-active device environment, you must
delete remote path settings, delete and unvirtualize the quorum disk, delete the command devices for pair management servers, and delete the virtual
storage machine.
Prerequisites
• Data on affected...

storage system) and unvirtualize the external volume (quorum disk).Be sure to perform this for both the primary and secondary storage.
3. Delete the command devices for global-active device pair management
servers.
a. In the  Unallocate Volumes  dialog box, unallocate the pair
management server and the command device.
b. On the  Resources  tab, in the  Storage Systems  tree, select the
primary or secondary storage system, and select  Volumes. In the
application area, click the  System GUI link.
c. From...

About replicating volumes (pair management)Volume replication is used to make copies of critical data for volumesallocated to hosts or file servers. You can make a local copy of a volume in
the same storage system, or make a remote copy of a volume in a different
storage system.
HCS provides several volume replication solutions based on pair management requirements and related licensing:
• This section addresses using a basic version of Replication Manager (included with the Device Manager license) that...

Copy pair management operationsYou can perform the following pair management functions in HitachiCommand Suite:
• Define, create, and delete open volume copy pairs • Modify copy-pair tasks ○create: Creates a copy pair
○ split: Separates a copy pair
○ resync: Synchronizes a secondary volume with the primary volume
○ restore: Restores the copy pair from a secondary volume to the primary
volume
○ delete: Releases a copy pair and changes the status to simplex
• View information from the Hosts, Storage...

Related tasks
•
Defining copy pairs  on page 309
•
Changing the status of a copy pair  on page 310
•
Deleting command devices  on page 311
Related references
•
Copy pair management operations  on page 308
Editing command devices You can edit an existing command device.
Procedure 1. From the  Actions menu, select  Manage Replication  to start Replication
Manager.
2. From the  Explorer menu select  Resources and then Storage
Systems .
3. Expand the tree and select the desired storage system.
4. Click the...

3.On the  Unpaired  tab, select the volumes from which copy pairs will be
defined and click  Pair Management .
The Pair Configuration wizard opens.
4. Follow the steps in the Pair Configuration wizard to define copy pairs.
For details about how to specify copy-pair conditions and how to use the Pair Configuration wizard, see the Replication Manager online help.
5. From the  Explorer menu, select  Tasks, and then select  Tasks again to
confirm that the task was properly executed.
6. Confirm the copy-pair...