This sounds like an important problem
> > Hi...
> >
> > Here's my system:
> >
> > 2 Intel 3 Ghz 5160 dual-core cpu's
> > 0 SATA 750 GB disks running as a ZFS RAIDZ2 pool
> > 8 GB Memory
> > SunOS 5.11 snv_79a on a separate UFS mirror
> > ZFS pool version 10
> > No separate ZIL or ARC cache
> > ran into a problem today where the ZFS pool jammed
> > for an extended
> > eriod of time. During that time, it seemed
> > read-bound doing only read
> > I/O's (as observed with "zpool iostat 1") and I
> saw
> > 100% misses while
> > running arcstat.pl (for "miss%", "dm%", "pm%" and
> > "mm%"). Processes
> > accessing the pool were jammed, including remote
> NFS
> > mounts. At the time,
> > I was: 1) running a scrub, 2) writing 10's of
> MB/sec
> > of data onto the pool
> > as well as reading from the pool, 3) was deleting
> a
> > large number of files
> > on the pool. I tried killing one of the jammed
> "rm"
> > processes and it
> > eventually died. The # of misses seen in
> arcstat.pl
> > eventually dropped
> > back down to the 20-40% range ("miss%"). A while
> > later, writes began
> > occuring to the pool again and remote NFS access
> also
> > freed up and overall
> > system behaviour seemed to normalize. This all
> > occurred over the course
> > of approximately an hour.
> >
> > Does this kind of problem sound familiar to
> anyone?
> > Is it a ZFS problem,
> > r have I hit some sort of ZFS load maximum and
> this
> > is the response?
> > Any suggestions for ways to avoid this are
> welcome...
> >
> > Thanks...
> > Art
> > thur A. Person
> > Research Assistant, System Administrator
> > Penn State Department of Meteorology
> > email: [EMAIL PROTECTED], phone: 814-863-1563
> > _______________________________________________
> > zfs-discuss mailing list
> > zfs-discuss@opensolaris.org
> >
> http://mail.opensolaris.org/mailman/listinfo/zfs-discu
>
> > ss
>
> Hi Art,
>
> I have seen a similar problem that is happening on
> several servers since a recent upgrade from b70 to
> b86/b87. For no obvious reason, the servers will
> stop writing to the pool for long periods of time.
> Watching a "zpool iostat", I can see that 0 writes
> are being done for up to a minute at a time.
> Meanwhile, a large amount of small (~3K) reads are
> happening. The servers behave like this for an hour
> or more at a time.
>
> The server configuration is:
> Dual-core Opteron 2212HE
> 4GB ECC DDR2 RAM
> 15 1TB SATA drives in a RAID-Z2 pool
> 2 Supermicro SAT2-MV8 controllers
> SunOS 5.11 snv_86
> UFS root and swap are on their own disk
>
> Have you made any progress with this problem? Has
> anyone else seen this behavior?
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