Apple Xsan 2 - Manual (Page 75)

Chapter 5 Manage SAN storage 75
5 In the Configure Volume Storage pane, click New Affinity Tag (or New Pool) to add an
affinity tag (or storage pool), and then drag LUNs to the new tag (or pool).
Important: Add LUNs to a new affinity tag in the recommended multiples. Otherwise,
serious volume fragmentation can result.
6 Click Continue to unmount and stop the volume, add the new storage, and remount
the expanded volume.
From the command line
You can also add a storage pool by editing the associated volume configuration file
in Terminal. For information, see the
cvfs_config man page or “Xsan configuration
files” on page 158.
You can see the cvfs_config man page by entering this command in Terminal:
$ man -M /System/Library/Filesystems/acfs.fs/Contents/man/ 4 cvfs_config
Add LUNs to an affinity tag
You can increase the size of a SAN volume that’s based on a built-in volume type by
adding LUNs (RAID arrays or array slices) to affinity tags. Xsan Admin assigns those
LUNs to underlying storage pools for you, creating storage pools as needed, based on
the optimal number of LUNs per pool for the volume type (“Assign LUNs to affinity
tags” on page 48).
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 only journal data or metadata.