Date: Wed, 3 Nov 2010 19:28:15 +0100 From: Olivier Smedts <olivier@gid0.org> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: ZFS v28 is ready for wider testing. Message-ID: <AANLkTi=pEnf4XKoMXdWdu4VRj9i0jRN8ETJN4V9ZBky9@mail.gmail.com> In-Reply-To: <20100831215915.GE1932@garage.freebsd.pl> References: <20100831215915.GE1932@garage.freebsd.pl>
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2010/8/31 Pawel Jakub Dawidek <pjd@freebsd.org>: > Hello. > > I'd like to give you ZFS v28 for testing. If you are neither brave nor > mad, you can stop here. > > The patchset is very experimental. It can eat your cookie and hurt your > teddy bear, so be warned. Don't try it for anything except testing. > > This patchset is also a message we, as the FreeBSD project, would like > to send to our users: Eventhough OpenSolaris is dead, the ZFS file > system is going to stay in FreeBSD. At this point we have quite a few > developers involved in ZFS on FreeBSD as well as serveral companies. > We are also looking forward to work with IllumOS. > > So, what this new ZFS brings? > > - Data deduplication. Read more here: > > =A0 =A0 =A0 =A0http://blogs.sun.com/bonwick/entry/zfs_dedup > > - Triple parity RAIDZ (RAIDZ3). Read more here: > > =A0 =A0 =A0 =A0http://dtrace.org/blogs/ahl/2009/07/21/triple-parity-raid-= z/ > > - zfs diff. Read more here: > > =A0 =A0 =A0 =A0http://arc.opensolaris.org/caselog/PSARC/2010/105/20100328= _tim.haley > > - zpool split. Read more here: > > =A0 =A0 =A0 =A0http://arc.opensolaris.org/caselog/PSARC/2009/511/20090924= _mark.musante > > - Snapshot holds. Read more here: > > =A0 =A0 =A0 =A0http://arc.opensolaris.org/caselog/PSARC/2009/297/20090511= _chris.kirby > > - zpool import -F. Allows to rewind corrupted pool to earlier > =A0transaction group. > > - Possibility to import pool in read-only mode. > > And much, much more, including plenty of preformance improvements and bug > fixes. > > So test whatever you can and report back. Look for regressions, strange > behaviour, missing features, deadlocks, livelocks, preformance > degradation, etc. > > The boot code is not updated at all, so booting off of ZFS doesn't > currently work. > > The patch is against today's FreeBSD HEAD. > > The patch enables (in sys/modules/zfs/Makefile) ZFS internal debugging, > please don't turn it off. Also, compile your kernel with the following > options: > > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 KDB > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 DDB > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 INVARIANTS > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 INVARIANT_SUPPORT > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 WITNESS > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 WITNESS_SKIPSPIN > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 DEBUG_LOCKS > =A0 =A0 =A0 =A0options =A0 =A0 =A0 =A0 DEBUG_VFS_LOCKS > > Ignore all the LOR (Lock Order Reversal) reports from WITNESS. There will > be plenty of those, and you'll desperately want to report them, but pleas= e > don't. > > The best way to report a problem is to answer to this e-mail with as shor= t > as possible procedure of how to reproduce it and debugging info. I'd > prefer textdump if possible. Below you can find quick procedure how to > setup textdumps: > > =A0 =A0 =A0 =A0Choose spare/swap disk/partition in your system, let's say= it is > =A0 =A0 =A0 =A0/dev/ad0s1b. > > =A0 =A0 =A0 =A0Add the following line to /etc/fstab: > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0/dev/ad0s1b =A0 =A0 none =A0 =A0swap =A0 = =A0sw =A0 =A0 =A00 =A0 =A0 =A0 0 > > =A0 =A0 =A0 =A0Add the following line to /etc/rc.conf: > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0ddb_enable=3D"YES" > > =A0 =A0 =A0 =A0Run the following commands: > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0# /etc/rc.d/swap1 start > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0# /etc/rc.d/dumpon start > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0# /etc/rc.d/ddb start > > =A0 =A0 =A0 =A0This will setup swap, mark it as dump device and setup som= e DDB > =A0 =A0 =A0 =A0scripts. Or you can just reboot. > > =A0 =A0 =A0 =A0Now when your system panic or deadlock, enter DDB and call= the > =A0 =A0 =A0 =A0following command: > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0ddb> run kdb.enter.panic > > =A0 =A0 =A0 =A0It will execute all the commands I need, dump them in text= format to > =A0 =A0 =A0 =A0your swap device and reboot machine. > > =A0 =A0 =A0 =A0After the reboot, you should find textdump.tar.0 file in /= var/crash/ > =A0 =A0 =A0 =A0directory. This is the debug info I need. > > End of textdumps procedure. > > Ok, now that I know you read everything carefully, here is the patch: > > =A0 =A0 =A0 =A0http://people.freebsd.org/~pjd/patches/zfs_20100831.patch.= bz2 Hello, Any status update on this ? I regularly check http://people.freebsd.org/~pjd/patches/ to see if there's an updated version of your patch. 2 months old is quite a bit for -CURRENT, which often receives commits on zfs&co parts. Thanks for all your work on FreeBSD (not only ZFS). > > Good luck! >:> > > -- > Pawel Jakub Dawidek =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 http://ww= w.wheelsystems.com > pjd@FreeBSD.org =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 http:= //www.FreeBSD.org > FreeBSD committer =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Am I Ev= il? Yes, I Am! > --=20 Olivier Smedts=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=A0 _ =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 ASCII ribbon campaign ( ) e-mail: olivier@gid0.org=A0 =A0 =A0 =A0 - against HTML email & vCards=A0 X www: http://www.gid0.org=A0 =A0 - against proprietary attachments / \ =A0 "Il y a seulement 10 sortes de gens dans le monde : =A0 ceux qui comprennent le binaire, =A0 et ceux qui ne le comprennent pas."
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