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7. Redeploying the original storage subsystem controller.
Redeploying the original storage subsystem
The following notes describe information that you must consider before you
redeploy the original storage subsystem.
Redeployment limitations
Controller replacement of a partial set of the storage enclosures, hard disk drives,
or both that were part of a working configuration is not supported. In addition,
you can redeploy the original storage subsystem controller only if new hard disk
drives are used in the redeployed subsystem. This is a requirement regardless of
whether the original storage subsystem is redeployed in the same Ethernet
network.
A hard disk drive is new if it is not used in any storage subsystem configuration.
A hard disk drive that is inserted in a hard disk drive bay of an operational
configuration, even if it is not configured as part of any array, is a used hard disk
drive. When you redeploy by using new hard disk drives, a new storage array
identifier (SA ID or storage subsystem worldwide name) is generated, which
allows the management of the redeployed original and the new storage subsystem
in the same Ethernet network.
In rare circumstances, the newly generated storage array identifier of the
redeployed original storage subsystem is the same as the storage array identifier
that was adopted in the new storage subsystem from the migrated hard disk
drives. When this happens, the DS Storage Manager Client program cannot
manage the redeployed original and new storage subsystem. Also, DS Storage
Manager Client program version 10.50 or later identifies both of these subsystems
as one managed entry in the Enterprise Management window. To verify this
condition, complete the following steps:
1. Exit from the DS Storage Manager Client program.
2. Turn off the power to either the redeployed original or the new storage
3. Restart the DS Storage Manager Client program and retrieve the storage
m. Ensure that each enclosure ID in each drive loop/channel contains a
unique first-position digit (x1). In addition, if the storage enclosures are
recabled behind the new storage subsystem controller, modify the
second-position digit (x10) so that it is the same in all IDs for all the
storage enclosures in a drive channel/loop.
If you are using the external key management method to manage the key
for the FDE drives, convert the key management method from local to
external management. For more information, see the IBM System Storage DS
Storage Manager Version 11.2 Installation and Host Support Guide
n. Update the switch zoning definitions and any applications that rely on the
storage subsystem worldwide names to use the new storage subsystem
worldwide names.
You can redeploy the original storage subsystem if it is used in a configuration
in which all of the installed hard disk drives are new. For more information,
see "Redeploying the original storage subsystem."
subsystem.
subsystem worldwide name from the storage subsystem profile. See Table 10 on
page 45.
Chapter 4. Upgrading a storage subsystem controller
53
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