Heads up for anyone else using persistent device names on RHEL:

RHEL 5.7 (kernel 2.6.18-274.el5, udev-095-14.27.el5) adds "user-friendly" 
descriptions to /dev/tape/by-id/*, thus breaking anything that depends on 
persistent names. /dev/tape/by-id/scsi-1IBM_3573-TL_XXXXXXXXXXXX_LL0 becomes 
/dev/tape/bu-id/scsi-1IBM_3573-TL_XXXXXXXXXXXX_LL0-changer, and the drives 
themselves get -sg, -st, -nst suffixes.

This is quite easy to fix, but takes some troubleshooting time if you weren't 
expecting it.
-- 
Rich Graves http://claimid.com/rcgraves
Carleton.edu Sr UNIX and Security Admin

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