ZFS patches.
George Hartzell
hartzell at alerce.com
Sun Aug 3 20:59:24 UTC 2008
Pawel Jakub Dawidek writes:
> Hi.
>
> http://people.freebsd.org/~pjd/patches/zfs_20080727.patch.bz2
>
> The patch above contains the most recent ZFS version that could be found
> in OpenSolaris as of today. Apart for large amount of new functionality,
> I belive there are many stability (and also performance) improvements
> compared to the version from the base system.
>
> Check out OpenSolaris website to find out the differences between base
> system version and patch version.
>
> Please test, test, test. If I get enough positive feedback, I may be
> able to squeeze it into 7.1-RELEASE, but this might be hard.
> [...]
Thanks Pawel!
I have a version of -CURRENT from 7-29-08 running on an AMD 3800+ with
2GB of RAM and two Seagate ST3300622AS disks.
This machine was previously running zfs filesystems using -STABLE.
It uses a root on zfs configuration based on
http://yds.coolrat.org/zfsboot.shtml
I tested for stablilty by firing up a bunch of xterms on my desktop
workstation, ssh'ing into the system and running a bunch of stuff in
parallel. The list of stuff settled down to be: two while(1) loops
that did "dd if=/dev/random of=FILENAME bs=1M count=1000" (w/ distinct
filenames) then removed the file; rsyncing a large directory of mp3's
from another local machine; make -j 4 buildworld; and several windows
with top, systat -vmstat 1, etc....
With the -STABLE zfs I ended up with the following settings to achieve
stability:
vm.kmem_size="512M"
vm.kmem_size_max="512M"
vfs.zfs.arc_max="192M"
I started off with no tuning, added the kmem_size{,_max} settings,
then added the arc_max setting and tuned it down until it didn't
wedge.
With the experimental code on -CURRENT I needed the following
settings:
vm.kmem_size="512M"
vm.kmem_size_max="512M"
vfs.zfs.arc_max="128M"
I don't know if I just got lucky with the larger arc_max under -STABLE
or if something's changed.
Otherwise the new code seems to be behaving nicely.
g.
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