Apple Xsan 1.4 - Manual (Page 146)

146 Chapter 7 Solving SAN Problems
Some LUNs Aren’t Listed in Xsan Admin
If you reuse an array that was previously labeled for use in another Xsan storage pool,
you might need to remove the old label before Xsan Admin will recognize the LUN as
available. This can also happen if you slice a LUN you used previously, in which case
you might need to relabel the first slice, which still has the old label.
To see if a LUN is mounted using an old label, open Terminal and type:
$ sudo cvlabel -l -s
This will show the old label. In the following sample output, the label is sanvol1:
/dev/rdisk4/ [APPLE Xserve RAID 1.23] CVFS “sanvol1” ...
If the disk is unlabeled, the file system and label are listed as “unknown,” as shown in
the following sample output:
/dev/rdisk4/ [APPLE Xserve RAID 1.23] unknown ...
If the disk is labeled, you need to remove the existing label.
To remove the old label:
m In Terminal, type:
$ sudo cvlabel -u label
where label is the old label ( sanvol1 in the example above).
After you unlabel the LUN, it should appear in the LUNs pane in Xsan Admin. If it still
does not appear, quit Xsan Admin and restart the server.