Hitachi Command Suite 8 User Guide

Note: When allocating volumes from the default virtual storage machine,
you do not need to select a virtual storage machine. The default virtual
storage machine is selected by default.
7. Select the volume type and volume location.
8. Click  Advanced Options  to specify tier, drive type, drive speed, RAID
level, or parity group in the volume criteria. The storage system will
search for volumes that match the criteria.
9. Click  LUN Path Options  to configure the number of LUN paths to
allocate per host...

Prerequisites
From the host, unallocate volumes that are related to resources that belong to the virtual storage machine you are removing.
Procedure 1. On the  Administration  tab, select Virtual Storage Machine , select a
virtual storage machine in the list, and then click  Edit Virtual Storage
Machine .Note: If you are performing a global-active device setup, click  Edit
Virtual Storage Machine  on the Set Up Global-Active Device
window.
2. Verify the  Name and Virtual Model and Serial No.  of the...

Deleting virtual storage machinesYou can delete virtual storage machines that are no longer required. Deletinga virtual storage machine also deletes all of the virtual information about the
resources that belong to that virtual storage machine and removes the
resources from the virtual storage machine.
Prerequisites
From the host, unallocate the volumes that belong to the virtual storage
machine that you are deleting.
Procedure 1. On the  Administration  tab, select Virtual Storage Machine .
2. From the...

274Managing virtual storage machinesHitachi Command Suite User Guide 

7
Replicating volumes for continuousaccess
Volume replication is used for creating in-system or remote storage system
volume copies for data protection. Global-active device provides copy pair replication for active-active high availability in a multi-site environment.
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About global-active device
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Setting up a global-active device environment
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Monitoring and managing global-active device pairs
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Recovering from global-active device failures
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Discontinuing a global-active device environment
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Volume...

About global-active deviceGlobal-active device employs volume replication (P-VOL and S-VOL in a bi-
directional copy pair) to provide a high availability (HA) environment for
hosts across storage systems and sites. The purpose of global-active device
is to provide data protection and minimize data access disruptions for host applications due to storage system or site failures.
A virtual storage machine represents storage resources such as parity groupsand LDEVs (volumes). To support global-active device...

The global-active device environment resolves the details of all read/write
activity to the global-active device pair. For example, when the host writes
data to LDEV ID 01, data is replicated to LDEV ID 02. If the host path to
primary storage fails, the host can continue to perform read/write operations using the secondary storage volume.
When a global-active device pair is established, application server high-
availability benefits include:
• Continuous I/O: If a primary volume becomes unavailable, the...

In the figure above:
• The primary, secondary, and quorum storage systems are located across three sites, typically separated by short distances (campus) or
intermediate (metro) distances. Distance can affect the required path management software for hosts. The primary and secondary storage
systems must be VSP G1000 storage systems. The quorum storage system
monitoring the status of the primary and secondary storage can be any external storage system that supports virtualization of its volumes and is...

Note: In a global-active device environment, a single HCS management
server node should be used to discover the primary, secondary and
quorum storage systems, and the required hosts and pair management
servers at the primary and secondary sites. A complete view of resources
is required for HCS global-active device setup tasks, for allocating global-
active device pairs using the pair management servers, and for displaying
P-VOL/S-VOL I/O metrics in the Analytics tab.
If you discover resources by using...

If the host OS is HP-UX 11iv3 and you are using the native multi-pathing
features, execute the following command in advance to disable the multi-
pathing features for legacy device special files:
scsimgr save_attr -a leg_mpath_enable=false
The following workflow describes the necessary planning and implementation steps for creating, monitoring and managing a global-active device
environment.
280Replicating volumes for continuous accessHitachi Command Suite User Guide