Lun Affinity; Disk Array Creation; Logical Drive Settings - Promise Technology VTRAK E310f Product Manual

VTrak E-Class Product Manual

LUN Affinity

VTrak Fibre Channel subsystems with two controllers include a LUN Affinity
feature. Normally, either controller can access all logical drives. LUN Affinity
enables you to specify which controller can access each logical drive. Use this
feature to balance the load of your logical drives between the two controllers.
To use LUN Affinity you must:
• Have two controllers in the subsystem
• Enable LUN Affinity under controller settings. See page 101 or page 147.

Disk Array Creation

When you create a logical drive using the Advanced method of disk array
creation, you can specify the Preferred Controller ID:
• Controller 1 – Assign all logical drives to Controller 1
• Controller 2 – Assign all logical drives to Controller 2
• Automatic – Alternate logical drive assignments between Controllers 1 and 2
Automatic is the default and preferred setting because it will balance the logical
drive assignments for you.
When you create a logical drive using the Automatic or Express disk array
creation, the logical drives are assigned alternatively between Controllers 1 and 2
automatically.
See "Creating a Disk Array – Automatic" on page 115, "Creating a Disk Array –
Express" on page 115, or "Creating a Disk Array – Advanced" on page 116.

Logical Drive Settings

After you have created a logical drive, you can click on the Settings tab and
manually change the Preferred Controller ID between Controller 1 and Controller
2. See "Making Logical Drive Settings" on page 129.
If you create logical drives with LUN Affinity disabled, the Preferred Controller ID
will show N/A, and your logical drives will be visible to both controllers.
If you create logical drives with LUN Affinity disabled, and later you enable LUN
Affinity, all of your logical drives will be assigned to Controller 1. To balance the
load, you can reassign some of your logical drives to Controller 2 under the
Preferred Controller ID in the Settings tab. See "Making Logical Drive Settings"
on page 129.
When you a delete a logical drive, the remaining logical drives keep the same
Controller assignments. If you want to rebalance controller assignments of the
remaining logical drives, change their Preferred Controller IDs in the Settings tab.
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