Apple Xsan 1.4 - Manual (Page 80)

80 Chapter 3 Managing SAN Storage
Adding LUNs to a Storage Pool
You can increase the capacity of a SAN volume by adding LUNs (RAID arrays or array
slices) to a storage pool that belongs to the volume.
Choosing Compatible LUNs
Add LUNs that are 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. If you’re adding a LUN to an existing storage
pool, the LUN must be at least as large as the other LUNs in the pool.
Note: A storage pool can’t contain more than 32 LUNs, the total number of LUNs in a
volume can’t be greater than 512, and you can’t add LUNs to a storage pool that
contains journal data or metadata.
To add a LUN to a storage pool:
1 Connect the new LUN to the SAN’s Fibre Channel and Ethernet networks.
2 Use RAID Admin to create the RAID array or slice. For help, see Using RAID Admin 1.2
and Disk Utility (available at www.apple.com/server/documentation/) or look in the
RAID Admin onscreen help.
Note: Don’t use Disk Utility to format the new array. You’ll use Xsan Admin to format
the array for Xsan in step 6.
3 Open Xsan Admin, select the volume in the SAN Components list, click Clients, and
unmount the volume from all clients and controllers.
4 Stop the volume.