On Thu, 12 Jul 2007, Bill Sommerfeld wrote:
> On Thu, 2007-07-12 at 10:45 -0700, Bart Smaalders wrote:
>> <aside>
>> For those of us who've been swapping to zvols for some time, can
>> you describe the failure modes?
>> </aside>
>
> I asked about this during the zfs boot inception review -- the high
> level answer is occasional deadlock in low-memory situations (zfs needs
> to allocate memory to free memory via pageout/swapout, but the system
> doesn't have any to give zfs)
>
> the relevant bug appears to be:
>
> 6528296 system hang while zvol swap space shorted
Yep - I've seen this on Sol 10 Update 3 with swap on the dedicated UFS
boot disk and a 2-way ZFS mirror that is doing everything else -
including a zvol based swap. The box will eventually get too slow to
be useable and the only fix is to reboot. Usually this bug will be
"tickled" after running a (weekly) zpool scrub (on ~ 270Gb of data).
The box is an AMD x4400 with 4Gb of RAM. It drives 22" and 30"
monitors (Nvidia) and runs about 18 Gnome workspaces. Its my "window"
into the world. To date it has averaged about 6 weeks between
reboots. I know that zfs could be tuned - but update 4 is not too far
away. Aside from this minor irritation ... this box is a pure
pleasure to work on and ZFS (and snapshots) totally rocks.
Regards,
Al Hopper Logical Approach Inc, Plano, TX. [EMAIL PROTECTED]
Voice: 972.379.2133 Fax: 972.379.2134 Timezone: US CDT
OpenSolaris Governing Board (OGB) Member - Apr 2005 to Mar 2007
http://www.opensolaris.org/os/community/ogb/ogb_2005-2007/
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