ZFS v28 is ready for wider testing.

Petersen Liman rabbit8888 at gmail.com
Wed Sep 1 05:49:54 UTC 2010


Cool, but i may try this on a VM and maybe try this on a expermential
production system after I test it on  VM since a real system may help
the progress of the new ZFS sinc

On Tue, Aug 31, 2010 at 8:09 PM, Zhu Han <schumi.han at gmail.com> wrote:
> 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 at 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 at FreeBSD.org                           http://www.FreeBSD.org
>> FreeBSD committer                         Am I Evil? Yes, I Am!
>>
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