Apple Xsan 2 - Manual (Page 76)

Choose compatible LUNs
LUNs you add to an existing storage pool must be at least as large as the LUNs in
the pool, but if a new LUN is larger than the other LUNs in the pool, its extra capacity
can’t be used. Always try to add LUNs that are identical or similar in performance and
capacity to the LUNs already in the storage pool. Mixing LUNs of different sizes or
speeds in the same storage pool wastes capacity and can degrade performance.
Action menu
Add a LUN to an affinity tag:
1 If you haven’t done so, connect the RAID system that hosts the LUN to the SAN Fibre
Channel network and turn on the device.
2 In Xsan Admin, select Volumes in the SAN Assets list.
3 Select the volume in the list and choose Expand Volume from the Action pop-up
menu (gear).
4 In the Label LUNs pane of the assistant, choose whether you want to label unlabeled
LUNs individually, or sequentially based on a label prefix.
If you label LUNs individually, click Edit LUN Label on the next pane and enter a new label.
If you use a label prefix, Xsan Admin adds a number to the end of the prefix to create
a label for each LUN. For example, if you use the prefix “LUN,” your LUNs are labeled
“LUN1,” “LUN2,” and so forth. Already-labeled LUNs aren’t affected.
If your LUNs are already labeled, they aren’t changed.
76 Chapter 5 Manage SAN storage