Date: Sat, 17 Aug 2002 14:48:48 -0700 (PDT) From: Lamont Granquist <lamont@scriptkiddie.org> To: Poul-Henning Kamp <phk@freebsd.org> Cc: current@freebsd.org, <mckusick@McKusick.COM> Subject: UFS Snapshots kinda buggy? Message-ID: <20020817143554.H1176-300000@coredump.scriptkiddie.org> In-Reply-To: <49833.1023282808@critter.freebsd.dk>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --0-1892123504-1029620928=:1176 Content-Type: TEXT/PLAIN; charset=US-ASCII So, I was playing around with snapshots and trying to come up with a cron job which would do automatic snapshots of a system, kind of similar to what you can get with a NetApp. I wrote the attatched (somewhat ugly) proof of concept script to manage a /.snapshot directory for all the mounted filesystems on a box. Running this in a tight loop caused some pretty severe problems where the box would tend to panic if i tried to remove some of the snapshot files. A whole lot of "rm, panic, reboot, fsck, wash, rinse, repeat" later I seem to have cleared all the snapshot files off my system and stabilized it. My -current snapshot is: > uname -a FreeBSD coredump.scriptkiddie.org 5.0-CURRENT FreeBSD 5.0-CURRENT #10: Sun Jul 28 18:30:39 PDT 2002 lamont@coredump.scriptkiddie.org:/usr/obj/usr/src/sys/COREDUMP i386 My mounts are: > mount /dev/ad0s1a on / (ufs, local, soft-updates) devfs on /dev (devfs, local) procfs on /proc (procfs, local) And my dmesg is attatched. Incidentally, it might be good to have mount report that a filesystem is a mounted snapshot. It would make it very easy to grep to select or remove all the mounted snapshots from the output of mount. I'm hoping that the rotatesnapshots script is enough to replicate and identify the bugs. If not, feel free to contact me and I can try to replicate them on my system to get more information on the specifics of the panics... --0-1892123504-1029620928=:1176 Content-Type: TEXT/PLAIN; charset=US-ASCII; name=rotatesnapshots Content-Transfer-Encoding: BASE64 Content-ID: <20020817144848.P1176@coredump.scriptkiddie.org> Content-Description: Content-Disposition: attachment; filename=rotatesnapshots IyEvYmluL3NoDQoNCmZvciBmcyBpbiBgbW91bnQgLXQgdWZzIHwgZWdyZXAg LXYgcmVhZC1vbmx5IHwgYXdrICd7IHByaW50ICQzIH0nYDsgZG8NCgllY2hv ICJyb3RhdGluZyBzbmFwc2hvdHMgb24gJGZzIg0KDQoJIyBjcmVhdGUgLnNu YXBzaG90IGRpcmVjdG9yeSBpZiBpdCBkb2Vzbid0IGV4aXN0DQoJaWYgWyAh IC1lICIkZnMvLnNuYXBzaG90IiBdOyB0aGVuDQoJCWVjaG8gImNyZWF0aW5n IC5zbmFwc2hvdCBkaXJlY3Rvcnkgb24gJGZzIg0KCQlta2RpciAiJGZzLy5z bmFwc2hvdCINCglmaQ0KDQoJIyBnZXQgbnVtYmVyIG9mIHNuYXBzaG90IGZp bGVzIGluIC5zbmFwc2hvdA0KCW51bT1gbHMgJGZzLy5zbmFwc2hvdCB8IGVn cmVwICJcLnNuYXAiIHwgd2MgLWxgDQoNCgkjIHVubGluayB0aGVtIGlmIHRo 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