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 Groups.
Result
The performance metrics of global-active device pairs have been displayed
for analysis.
Related concepts
•
About analyzing storage system performance  on page 403
Related tasks
•
Checking global-active device pair status  on page 297
Unallocating global-active device pairs When a host with global-active device pairs is no longer needed, or thevolume redundancy provided by global-active device pairs is no longer
required, you can unallocate the global-active device pairs.
Depending on conditions, when a user unallocates global-active device
volumes, the copy pair relationship will be ended, and related copy groups and configuration definition files (horcmN.conf) could be deleted as a result.
Prerequisites
• Identify the name of the target host, and the global-active device volumes to unallocate.
• If necessary, back up data on the target volumes.
• Unmount all allocated volumes that you plan to unallocate. An IT administrator might have to perform this task.
Procedure 1. Select a host OS, then select a host using global-active device volumes
and click  Unallocate Volumes .
Tip: 
If you select specific volumes for the host,  Unallocate Volumes
will go directly to the  Show Plan window.
2.From 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
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							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 it is submitted.
6. Click  Submit.
If the task is scheduled to run immediately, the process begins.
7. (Optional) Check the progress and result of the task on the  Tasks &
Alerts  tab. Click the task name to view details of the task.
Result
Unallocated global-active device volumes are added back to the storage system Open-Unallocated volume list.
Related concepts
•
About removing hosts and releasing associated resources  on page 73
Related tasks •
Unallocating individual global-active device volumes  on page 302
•
Discontinuing a global-active device environment  on page 305
Related references
•
Unallocate volumes dialog box  on page 216
Unallocating individual global-active device volumes Individual global-active device primary or secondary volumes can beunallocated.
Prerequisites
• Identify the name of the target host, and the global-active device primary or secondary volume to unallocate.
• If necessary, backup data for the target volume.
Procedure 1. On the  Resources  tab, select a host OS, then select a host using global-
active device volumes, and click  Unallocate Volumes.
Tip: 
If you select specific volumes for the host,  Unallocate Volumes
will go directly to the  Show Plan window.302Replicating volumes for continuous accessHitachi Command Suite User Guide 
						

							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 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 it is submitted.
6. Click  Submit.
If the task is scheduled to run immediately, the process begins.
7. (Optional) Check the progress and result of the task on the  Tasks &
Alerts  tab. Click the task name to view details of the task.
Result
Unallocated global-active device primary or secondary volumes are added back to the storage system Open-Unallocated volume list.
Related concepts
•
About removing hosts and releasing associated resources  on page 73
Related tasks
•
Unallocating global-active device pairs  on page 301
•
Discontinuing a global-active device environment  on page 305
Related references
•
Unallocate volumes dialog box  on page 216
Recovering from global-active device failures This module provides an overview of global-active device failures, where to
find detailed information, and specific tasks that can be performed from HCS.
About global-active device failures Failures need to be identified when they occur, and actions taken to remedythe failure and re-synchronize global-active device pairs.
Failure types include:
• Host path failures (HBAs, SAN switches, or Target ports) between hosts and primary or secondary storage systems.
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							• 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 information indicating unavailability of a P-VOL, an S-VOL, or both.
For all failures (except host path failures) SIM reference codes and descriptions are used to identify the nature of the failure. For detailed information on SIMs related to the global-active device environment, related
pair status information indicating the volume with the most recent data, and
recovery recommendations, see the  Hitachi Virtual Storage Platform G1000
Global-Active Device User Guide . When the failure has been resolved, copy
pairs need to be re-synchronized using CCI or Replication Manager.
HCS can be used to perform a limited number of recovery tasks that are
included in this section.
Related tasks •
Recovering from HBA-related host path failures  on page 304
Recovering from HBA-related host path failures Remedy the HBA-related host path failure that is preventing host I/O to the
storage system.
A SIM is not generated from a host path failure. However, there is a failure on
the physical path between the host and the storage system.
Procedure 1. Using multi-path or SAN management software, identify the failure
location.
2. Remedy the failure by doing one of the following:
• Reconnect the physical path or reconfigure the SAN to recover from the path failure.
• If you confirm a failed HBA, replace it.
3. Using multi-path software, resume I/O for the host on the recovered
path.
Note that I/Os from the host might be resumed automatically.
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							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 global-active device pairs has been saved.
• All global-active device pairs are unallocated, or the global-active device S- VOLs unallocated leaving normal volumes in use by hosts.
Procedure 1. Delete global-active device remote path settings.
a. On the  Resources  tab, right-click the target storage system, and
select  Remote Connections .
b. To delete a remote path, select a remote connection to be deleted in
the  Connections (To)  tab, and then select  Remove Remote Paths .
c. To delete all remote paths allocated to the secondary storage system
on the primary storage system, select the remote connections to be
deleted in the  Connections (To)  tab, and then select  Remove
Remote Connections .
2. Delete and unvirtualize the global-active device quorum disk.
a. On the  Resources  tab, in the  Storage Systems  tree, select and then
right-click the target storage system. From the menu, select  Remote
Connections .
b. In the  Remote Connections  window, on the Quorum disk tab,
select the quorum disk, confirm it is correct, and delete it.
Note:  To delete a quorum disk, all global-active device pairs that use
the quorum disk must be unallocated.
c. From  General Tasks , select Unvirtualize Volumes . In the
Unvirtualize Volumes  dialog box, select the external storage system
(quorum) and the internal storage system (primary or secondary
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							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 the volume list (LDEVs) that appear, select the command device
that you want to delete.
Tip:  Look for  Command Device  in the Attribute  column.
d.From  More Actions , select Edit Command Devices  and in the dialog
box that appears, delete the command device.
4. Delete the global-active device virtual storage machine and remove the
secondary storage system resources from the global-active device virtual
storage machine.
Note:  Before removing secondary storage system resources, you must
unallocate the volumes on the global-active device virtual storage machine.
a. On the  Administration  tab, select Virtual Storage Machine .
b. Select the virtual storage machine related to global-active device pairs
and click  Edit Virtual Storage Machine .
c. In the  Edit Virtual Storage Machine  window, select the secondary
storage system, and then select  Remove Storage Systems.
Result
The global-active device environment no longer exists.
Related tasks
•
Unallocating global-active device pairs  on page 301
•
Unallocating individual global-active device volumes  on page 302
Volume replication This module describes how to replicate volumes within a storage system, andto another storage system for data protection.
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							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 provides for common pair
management tasks (for example, create a pair) using the Actions menu, Manage Replication.
• To use full Replication Manager functionality from the Tools menu, you must register a Replication Manager license, and launch Replication
Manager with a user account that has Replication Manager permissions.
You can use wizards to visualize complex replication configurations while defining, editing, viewing, and troubleshooting copy pairs.
For information about setting up Replication Manager, see the:
• Hitachi Command Suite Administrator Guide
• Hitachi Command Suite System Requirements
For information about using Replication Manager, see the: • Hitachi Command Suite Replication Manager User Guide
• If Replication Manager and Hitachi Tuning Manager are installed and licensed, you can use the UR Performance Analysis window to check the
C/T delta (time lag) trend between primary and secondary volumes, and to
analyze, then resolve, possible Universal Replicator performance
bottlenecks.
See 
About analyzing Universal Replicator performance on page 424
Note:  To back up file systems created on a file server, use file server
management software.
Related concepts
•
Allocating storage  on page 133
Related tasks
•
Adding command devices  on page 308
•
Editing command devices  on page 309
•
Defining copy pairs  on page 309
•
Changing the status of a copy pair  on page 310
Related references
•
Copy pair management operations  on page 308
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							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 Systems, and Copy-Pair Configuration Definitions trees
• View tasks
• View workflows
• Add, edit, or delete command devices
• View event logs
• Switch to maintenance mode
To access other pair management functionality, you must register a Replication Manager license and log in to HCS with Replication Manager
permissions.
Related concepts
•
About replicating volumes (pair management)  on page 307
Adding command devices A command device supports replication operations by providing a
communication channel between hosts and storage for replication commands.
Procedure 1. From the  Actions menu, select  Manage Replication  to start the
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  Open link, and then on the  Cmd Devs tab, click Add Cmd
Devices  and add the command device.
Result
The added command device can be viewed by clicking the Open link from the
storage system name shown in the Replication Manager. The list of added
command devices are displayed in the Cmd Devs tab.
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							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  Open link and then on the  Cmd Devs tab click the pencil and
paper icon and edit the command device.
5. Follow the instructions in the window to edit the command device.
Result
The edited command device can be viewed by clicking the Open link from the storage system name in Replication Manager. The list of edited command
devices are displayed in the Cmd Devs tab.
Related tasks
•
Defining copy pairs  on page 309
•
Changing the status of a copy pair  on page 310
Related references •
Copy pair management operations  on page 308
Defining copy pairs Before you define copy pairs, determine the volumes that will be used to
define copy pairs and verify that the volumes are allocated to a host.
Procedure 1. From the  Actions menu, select  Manage Replication  to start Replication
Manager.
2. Display a list of volumes from the  Hosts tree or the  Storage Systems
tree.
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							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 definitions in the  Pair Configurations or Storage
Systems  view in Replication Manager.
From the list of volumes associated with  Hosts tree or  Storage
Systems , view the current copy pair status.Tip: To display the most recent SplitTime in Device Manager after
performing operations on a Copy-on-Write Snapshot or Thin Image copy pair, you need to refresh the storage system information.
Related references
•
Copy pair management operations  on page 308
Changing the status of a copy pair You can change the status of a copy pair.
Procedure 1. From the  Actions menu, select  Manage Replication  to start Replication
Manager.
2. From the  Hosts tree, select a host and click  Refresh Hosts.
All copy pairs associated with that host are refreshed.
3. Display the list of volumes from the  Hosts tree.
4. Click the icon to change the pair status.
5. Change the copy pair status by using the  Change Pair Status wizard.
For details on the conditions under which certain copy pair statuses can be changed and on how to change the status of a copy pair by using the
Change Pair Status wizard, see the Replication Manager online Help.
6. From the  Explorer menu, select  Tasks, then select  Tasks again to
confirm that the task is completed.
7. Confirm the copy pair status was changed by viewing the list of volumes
in the  Hosts view or the  Storage view in Replication Manager.
From the list of volumes in the  Hosts tree or the  Storage Systems
tree, view the current copy pair status.
310Replicating volumes for continuous accessHitachi Command Suite User Guide