Date: Wed, 1 Sep 2010 12:09:35 +0800 From: Zhu Han <schumi.han@gmail.com> 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=g=0LPcy=kmSFNBHX0=6OoHoN-e=z82H3-_WRW@mail.gmail.com> In-Reply-To: <20100831215915.GE1932@garage.freebsd.pl> References: <20100831215915.GE1932@garage.freebsd.pl>
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That's cool. Thank you for your work on it. best regards, hanzhu On Wed, Sep 1, 2010 at 5:59 AM, Pawel Jakub Dawidek <pjd@freebsd.org> wrote: > 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: > > http://blogs.sun.com/bonwick/entry/zfs_dedup > > - Triple parity RAIDZ (RAIDZ3). Read more here: > > http://dtrace.org/blogs/ahl/2009/07/21/triple-parity-raid-z/ > > - zfs diff. Read more here: > > > http://arc.opensolaris.org/caselog/PSARC/2010/105/20100328_tim.haley > > - zpool split. Read more here: > > > http://arc.opensolaris.org/caselog/PSARC/2009/511/20090924_mark.musante > > - Snapshot holds. Read more here: > > > http://arc.opensolaris.org/caselog/PSARC/2009/297/20090511_chris.kirby > > - zpool import -F. Allows to rewind corrupted pool to earlier > transaction 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: > > options KDB > options DDB > options INVARIANTS > options INVARIANT_SUPPORT > options WITNESS > options WITNESS_SKIPSPIN > options DEBUG_LOCKS > options 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 please > don't. > > The best way to report a problem is to answer to this e-mail with as short > 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: > > Choose spare/swap disk/partition in your system, let's say it is > /dev/ad0s1b. > > Add the following line to /etc/fstab: > > /dev/ad0s1b none swap sw 0 0 > > Add the following line to /etc/rc.conf: > > ddb_enable="YES" > > Run the following commands: > > # /etc/rc.d/swap1 start > # /etc/rc.d/dumpon start > # /etc/rc.d/ddb start > > This will setup swap, mark it as dump device and setup some DDB > scripts. Or you can just reboot. > > Now when your system panic or deadlock, enter DDB and call the > following command: > > ddb> run kdb.enter.panic > > It will execute all the commands I need, dump them in text format to > your swap device and reboot machine. > > After the reboot, you should find textdump.tar.0 file in /var/crash/ > directory. This is the debug info I need. > > End of textdumps procedure. > > Ok, now that I know you read everything carefully, here is the patch: > > http://people.freebsd.org/~pjd/patches/zfs_20100831.patch.bz2<http://people.freebsd.org/%7Epjd/patches/zfs_20100831.patch.bz2>; > > Good luck! >:> > > -- > Pawel Jakub Dawidek http://www.wheelsystems.com > pjd@FreeBSD.org http://www.FreeBSD.org > FreeBSD committer Am I Evil? Yes, I Am! >
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