Logical unit creation, deletion, and migration for HP StorageWorks MSA systems

Before you create, delete, or migrate logical units, you must read the storage configuration guidelines that are specified in the HP StorageWorks MSA1000 or MSA1500 documentation that is provided for this system.

Creating arrays

An array is a collection of physical disks. Use the storage configuration guidelines for the system to create arrays on the HP StorageWorks MSA.

Creating logical drives

The following types of Redundant Array of Independent Disks (RAID) are supported:

RAID 1+0
RAID 1
RAID 5
RAID 6 (ADG)

RAID 0 is not supported because it does not provide failure protection.

All stripe sizes are supported; however, use a consistent stripe size for the HP StorageWorks MSA.

Use the following settings for logical drives:

Set Max Boot to disabled.
Set Array Accelerator to enabled.
Note: If you are using the CLI, use the cache=enabled setting.

Presenting logical units to hosts

Set the Selective Storage Presentation (SSP), also known as ACL to enabled.

Use the following host profile settings:

Mode 0 = Peripheral Device LUN Addressing
Mode 1 = Asymmetric Failover
Mode 2 = Logical volumes connect as available on Backup Controller
Mode 3 = Product ID of 'MSA1000 Volume'
Mode 4 = Normal bad block handling
Mode 5 = Logout all initiators on TPRLO
Mode 6 = Fault management events not reported through Unit Attention
Mode 7 = Send FCP response info with SCSI status
Mode 8 = Do not send Unit Attention on failover
Mode 9 = SCSI inquiry revision field contains the actual version
Mode 10 = SCSI inquiry vendor field contains Compaq
Mode 11 = Power On Reset Unit Attention generated on FC Login or Logout
Mode 12 = Enforce Force Unit Access on Write

You can use the built-in Linux profile or Default profile to set the host profile settings. If you use the Default profile, you must issue the following Serial port CLI command to change the host profile settings:

change mode Default mode number

where mode number is the numeric value for the mode that you want to change.

For more information see the documentation that is provided for your HP StorageWorks MSA.

Important: You must use the Serial port CLI or the SSP to recheck the connection objects after the configuration is complete.

Migrating logical units

You can use the standard migration procedure to migrate logical units from the HP StorageWorks MSA to the system with the following restrictions:

You cannot share the HP StorageWorks MSA between a host and the system. You must migrate all hosts at the same time.
The subsystem device driver (SDD) and securepath cannot coexist because they have different QLogic driver requirements.
The QLogic driver that is supplied by HP must be removed and the driver that is supported by IBM must be installed.