Apple Xsan 2 - Manual (Page 124)

If you can’t add a storage pool
Some words are reserved and can’t be used to name a storage pool. If a storage pool
is used for user data, the first eight characters of the storage pool name can’t be a
reserved word. If you enter a reserved word as the storage pool name, the OK button
in the storage pool sheet is dimmed. Examples include: Affinity, Exclusive, Journal, Log,
MetaData, Regular, and Type.
For a register of reserved words, see the cvfs_config man page by entering this
command in Terminal:
$ man -M /System/Library/Filesystems/acfs.fs/Contents/man/ 4 cvfs_config
If Fibre Channel performance is poor
With some Fibre Channel switches, mismatched optical transceivers (GBICs) can cause
Fibre Channel communication errors and degrade SAN performance. Check with
the manufacturers of your Fibre Channel switches to see if you should use identical
transceivers (same manufacturer and model number) on both ends of your Fibre
Channel cables.
However, with Cisco Fibre Channel switches, you should use a Cisco transceiver on the
end of a cable that plugs into the switch and another qualified transceiver at the other
end of the cable.
For Fibre Channel hardware compatibility information, see the AppleCare Support
article at support.apple.com/kb/HT1769.
If a client can’t use a volume after a Fibre Channel
interruption
If a client loses its Fibre Channel connection to the SAN (for example, because a
cable is unplugged), the client might not recognize LUNs in an Xsan volume after the
connection is restored. If this happens, restart the client to remount the volume.
If problems persist, restart all SAN devices. Restart RAID systems first, then continue
with SAN controllers, and finally, restart all clients.
Check whether a computer is seeing Xsan volume LUNs:
Open Disk Utility on the computer and look for the LUNs in the list of disks and volumes.
m
From the command line
You can also check for accessible LUNs using the
cvlabel -l command or the
diskutil list command in Terminal. For information, see the cvlabel or diskutil
man page.
124 Chapter 9 Solve SAN problems