Apple Xsan 1.1 - Manual (Page 101)

Chapter 7 Solving SAN Problems 101
You’re Unable to Rename an Xsan Volume in the Finder
Xsan doesn’t allow a mounted Xsan volume to be renamed using the Finder. If you try,
you get a message saying the name you’ve typed can’t be used, even if the name you
type is an acceptable Xsan volume name. To rename an Xsan volume, you must use
Xsan Admin to reinitialize the volume. For instructions, see “Renaming a Volume” on
page 65.
You’re Unable to Restart a Volume After Adding LUNs or
Storage Pools
If you can’t restart a volume after you add LUNs or storage pools, you can follow these
steps to return the volume to its previous state.
To restore the previous volume configuration:
1 Quit Xsan Admin.
2 Delete the file /Library/Filesystems/Xsan/config/<volume>.cfg from each of the
volume’s controllers.
3 On each controller, rename the volume’s previous configuration file
/Library/Filesystems/Xsan/config/<volume>.cfg.backup
to
/Library/Filesystems/Xsan/config/<volume>.cfg
4 Open Xsan Admin and restart the volume.
Fibre Channel Performance Is Poorer Than Expected
Mismatched optical transceivers (GBICs) can cause Fibre Channel communication errors
and degrade SAN performance. To ensure good performance, use identical transceivers
(same manufacturer and model number) on both ends of your Fibre Channel cables.
You’re Unable to Add LUNs to a Storage Pool
You can’t add a new LUN to an existing storage pool unless the LUN is the same size as
the LUNs already in the pool.
Also, you can’t add a LUN to an existing storage pool if the storage pool is used to store
journal data or metadata. This applies to any storage pool set to be used for “Journaling
and metadata only” or “Any data.”
To check the data types a storage pool is used for:
m Open Xsan Admin, select the SAN or controller, and click Setup. Then click Storage,
double-click the storage pool in the list, and look next to “Use for” in the storage pool
settings sheet.