Apple Xsan 2 User Manual Page 77

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Chapter 5 Manage SAN storage 77
5 In the Congure Volume Storage pane, drag the new LUNs to anity tags.
Important: Add LUNs to anity tags in the recommended multiples. Don’t add
LUNs to existing storage pools in a custom volume. Otherwise, serious volume
fragmentation can result.
6 Click Continue to unmount and stop the volume, add the storage, and remount the
expanded volume.
From the command line
You can also add LUNs to an anity tag by editing the associated volume
conguration le and using the cvlabel command-line tool in Terminal. For
information, see the cvfs_config and cvlabel man pages or Xsan conguration
les on page 15 8 and Label, list, and unlabel LUNs (cvlabel) on page 151.
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
Rearrange Fibre Channel connections
If you need to rearrange Fibre Channel connections when adding LUNs to your SAN,
unmount SAN volumes from clients before you disconnect Fibre Channel cables or
turn o Fibre Channel switches. Otherwise, if you unplug or interrupt a Fibre Channel
connection between a client and a mounted volume, you might cause problems with
client apps, making the volume dicult to remount.
Set up a folder anity
Every storage pool in a volume has an anity tag. You can use the tag to be sure that
les in a folder are stored on a specic storage pool. Files in folders without anities
are stored on the next available storage pool according to the volumes allocation
strategy (ll, round-robin, or balance). For more information, see Anities and anity
tags” on page 35 and Folders with anities on page 36.
Some storage pools might be larger, faster, or better protected than others. Using
anities, you can make sure that an app or task that needs speed or extra protection
stores its les on a suitable storage pool.
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