Apple Xsan 2 - Manual (Page 72)

If you're using a custom volume type, you can increase storage by adding volumes
or storage pools, but don't add LUNs to an existing storage pool. Adding LUNs to an
existing storage pool in a custom volume can result in serious fragmentation.
Prepare LUNs
Each LUN in an Xsan volume is a RAID array. How you set up your arrays depends on
the storage device you use.
To create a set of LUNs for your SAN, use the administration software for your RAID
system to create, for example, LUNs based on different RAID schemes or LUNs based
on array stripes. Setup scripts for creating common LUN configurations on Promise
RAID systems are available at www.apple.com/support/.
Find the drive modules that belong to a LUN
To see which physical drive modules belong to a LUN, you can use Xsan Admin to turn
on the drive activity lights on the RAID system that hosts the LUN.
Click to turn on
drive lights for
selected LUN.
Find a LUN’s drives:
In Xsan Admin, select LUNs in the SAN Assets list, select a LUN in the list of LUNs, and
m
then click the “Identify LUN Using RAID Lights” button in the lower-right corner of the
window. Then, look at your RAID hardware to find the drives with activity lights that
are on.
72 Chapter 5 Manage SAN storage