Configuring IBM System Storage DS5000 and IBM DS4000 systems for the storage server

IBM® System Storage® DS5000 and IBM DS4000® disk controllers are supported with the SAN Volume Controller cluster.

The following steps provide the supported options and impact on the SAN Volume Controller cluster:

Perform the following steps for the host type option:
1. Depending on your IBM System Storage DS5000 or IBM DS4000 model, you must set either the default host type of the system, or the host type of the chosen partition to one of the following:
```
IBM TS SAN VCE
SAN Volume Contr
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  1. Click Storage Subsystem > Change > Default Host Type, or
  2. For each host port, you can specify the host type of that port or modify existing ports.
Perform the following steps for the worldwide node name (WWNN) option:
1. Set the system so that both controllers have the same WWNN.
2. See the following Web site for the scripts that are available to change the setup of the IBM System Storage DS5000 or IBM DS4000 system:
  www.ibm.com/storage/support/
Perform the following steps for the auto volume transfer (AVT) option:
1. Ensure that the AVT option is enabled. The host type selection should have already enabled the AVT option.
2. View the storage system profile data to confirm that you have the AVT option enabled. This storage profile is presented as a text view in a separate window.
3. See the following Web site for the scripts that are available to enable the AVT option:
  www.ibm.com/storage/support/

The following limitations apply to partitions:

Only one IBM System Storage DS5000 or IBM DS4000 system storage partition that contains any of the ports of any of the nodes in a single SAN Volume Controller cluster can be created.
Only map one partition to any of the ports on any of the nodes that are in the SAN Volume Controller cluster to avoid unexpected behavior. For example, you can lose access to your storage or you might not receive warning messages, even if there are errors logged in the SAN Volume Controller error log.

The following limitation applies to IBM System Storage DS5000 and IBM DS4000 Copy Services:

Do not use IBM System Storage DS5000 or IBM DS4000 Copy Services when the SAN Volume Controller cluster is attached to an IBM System Storage DS5000 or IBM DS4000 system.
You can use partitioning to allow IBM System Storage DS5000 or IBM DS4000 Copy Services usage for other hosts.

The following information applies to the access LUN (also known as the Universal Transport Mechanism (UTM) LUN):

The access/UTM LUN is a special LUN that allows a IBM System Storage DS5000 or IBM DS4000 system to be configured through software over the fibre-channel connection. The access/UTM LUN does not have to be in the partition that contains the SAN Volume Controller ports because the access/UTM LUN is not required by the SAN Volume Controller cluster. No errors are generated if the access/UTM LUN is not in the partition.

The following information applies to the logical unit (LU):

The SAN Volume Controller cluster attempts to follow the preferred ownership that is specified by the IBM System Storage DS5000 or IBM DS4000 system. You can specify which controller (A or B) is used for I/O operations to an LU.
If the SAN Volume Controller cluster can see the ports of the preferred controller and error conditions do not exist, the SAN Volume Controller cluster accesses the LU through one of the ports on the preferred controller.
If error conditions exist, the SAN Volume Controller cluster ignores the preferred ownership of the IBM System Storage DS5000 or IBM DS4000 system.