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Operating Systems
Linux
Red Hat
Volume group not activated at boot after SAN migration
Post 302952168 by rbatte1 on Friday 14th of August 2015 12:02:58 PM
08-14-2015
Moderator
We're sure this is not NAS. Plain fibre cards with SCSI devices being detected. We probe down the fibre cards which generates /dev/sdn devices. We then blend the four paths to form multipath devices that we then use as a PV to add to the volume groups.
Much of this is automatic first time, but we did a bit of the hokey-cokey on our first few attempts so after clearing old definitions away the auto-discovery stopped.
Everything seemed fine whilst we had the new LUNs in the VG and in use but the old ones not removed. A boot would complete normally, it's just when we've removed the old LUNs from the VGs that it went off. Perhaps the old LUNs (as part of the VGs) had the VG information on them and so they would respond and the VG would vary on even though there were LUNs still initialising.
All very confusing though
Robin
Much of this is automatic first time, but we did a bit of the hokey-cokey on our first few attempts so after clearing old definitions away the auto-discovery stopped.
Everything seemed fine whilst we had the new LUNs in the VG and in use but the old ones not removed. A boot would complete normally, it's just when we've removed the old LUNs from the VGs that it went off. Perhaps the old LUNs (as part of the VGs) had the VG information on them and so they would respond and the VG would vary on even though there were LUNs still initialising.
All very confusing though
Robin
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LEARN ABOUT DEBIAN
rescan-scsi-bus
RESCAN-SCSI-BUS.SH(8) System Manager's Manual RESCAN-SCSI-BUS.SH(8) NAME
rescan-scsi-bus.sh - rescan the SCSI bus. SYNOPSIS
rescan-scsi-bus.sh [ -l ] [ -w ] [ -c ] [ -r ] [ host... ] DESCRIPTION
rescan-scsi-bus.sh is a program that is used to rescan the SCSI bus using the SCSI add-single-device feature of the Linux SCSI layer. OPTIONS
-l Activates scanning for LUNs 0 .. 7 (default: 0). -L NUM Activates scanning for LUNs 0 .. LUN (default: 0). --luns=LIST Scan only LUNs in LIST. -w Enables scanning for device IDs 0 .. 15 (default: 0 .. 7). --ids=LIST Scan only device IDs in LIST. -i, --issue-lip Issue a FibreChannel LIP reset (default: disabled). -r, --remove Enables removing of devices (default: disabled). --forceremove Remove and readd every device (dangerous). -c Enables scanning of channels 0 1 (default: 0). --channels=LIST Scan only channels in LIST. host, --hosts=LIST If host adapters are given, only these are scanned (default: all). --nooptscan Don't stop looking for LUNs if 0 is not found. --color Use coloured prefixes OLD/NEW/DEL. LIST is a comma separated list of single values and ranges (no spaces allowed), e.g. 0,2-3,8,10-15. AUTHOR
rescan-scsi-bus.sh was written by Kurt Garloff <garloff@suse.de>. COPYRIGHT
This program is free software. You can use it under the terms of the GNU GPL (General Public License) Version 2 (or any later version, at your option). Note, that the GNU GPL implies, that there is NO WARRANTY at all. Full text of the GPL can be found in /usr/share/common- licenses/GPL file. AVAILABILITY
rescan-scsi-bus.sh is available from http://www.garloff.de/kurt/linux/scsidev/ March 1998 RESCAN-SCSI-BUS.SH(8)