31 Aug 23:59 2010
ZFS v28 is ready for wider testing.
Pawel Jakub Dawidek <pjd <at> FreeBSD.org>
2010-08-31 21:59:15 GMT
2010-08-31 21:59:15 GMT
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 Good luck! >:> -- -- Pawel Jakub Dawidek http://www.wheelsystems.com pjd <at> FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am!