Date: Sun, 5 Dec 2004 19:16:07 -0800 (PST) From: orville weyrich <weyrich_comp@yahoo.com> To: freebsd-questions <freebsd-questions@freebsd.org> Subject: VINUM Disaster Recovery Message-ID: <20041206031607.52973.qmail@web50710.mail.yahoo.com>
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--0-163051839-1102302967=:52366 Content-Type: text/plain; charset=us-ascii Content-Id: Content-Disposition: inline I have a 10 disk VINUM configuration and two of the disks are trashed. In theory there is still enough redundant information to get things working again without data loss. Vinum has detected a configuration error (duh -- two disks are toast, plus in recovery I accidently created two more plexes) and taken upon itself to stop configuration updates to prevent any further corruption (thanks! :-). At this point I have looked at http://www.vinumvm.org/vinum/how-to-debug.html and have run a command like the following: ( dd if=/dev/da9s1e skip=8 count=50 | tr -d '\000-\011\200-\377' ; echo ) > da9s1e.log on all 10 disks to obtain a file containing each disk's on-disk configuration. As hoped, eight of the disks show an output similar to the attached file da1s1e.log (differing only as expected in the first line). See attached flog file for a sample output. PLEASE HELP CONFIRM MY PLAN (FOLLOWING) FOR PROCEEDING -- I DO NOT WANT TO DO ANYTHING DISASTEROUS. My thought is that I need to turn on updates, then delete the two unwanted plexes raid.p2 and raid.p3(which were accidentally created), detach the corrupt sdisks, and then hopefully VINUM will forget about the two disks that are toast (or do I somehow have to tell VINUM to forget the disks?). My plan is as follows: First, selectively start vinum: vinum -> read /dev/da1s1e /dev/da2s1e /dev/da3s1e /dev/da4s1e /dev/da5s1e /dev/da6s1e /dev/da7s1e /dev/da8s1e Second, enable configuration updates: vinum->setdaemon 0 Third, save the configuration: vinum->saveconfig Fourth, stop and remove the two unwanted plexes and all attached subdisks: vinum->stop -f raid.p3 vinum->stop -f raid.p2 vinum->rm -r raid.p3 vinum->rm -r raid.p2 Fifth, stop and detach the corruped subdisks: vinum->stop -f raid.p0.s0 vinum->stop -f raid.p0.s9 vinum->stop -f raid.p1.s4 vinum->stop -f raid.p1.s5 vinum->detach raid.p0.s0 vinum->detach raid.p0.s9 vinum->detach raid.p1.s4 vinum->detach raid.p1.s5 At this point I expect to have a functional volume that can be mounted and backed up, prior to the next step of reinstalling the crashed disks, creating new subdisks, attaching them to the plexes, and resynching. PLEASE CONFIRM MY APPROACH OR TELL ME WHERE I AM WRONG! Thanks orville __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! 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