a difficult-to-describe problem involving long write times and enormous load levels

Daniel Brooks dlb48x at gmail.com
Tue May 24 00:01:52 EDT 2011


On Sun, May 22, 2011 at 11:54 PM, Fajar A. Nugraha <list at fajar.net> wrote:

> On Mon, May 23, 2011 at 2:08 AM, Daniel Brooks <dlb48x at gmail.com> wrote:
> > Ok, This morning the load is only 19, but everything that interacts with
> a
> > zfs filesystem is locked up. iostat says that there is zero activity on
> > those disks:
>
> That definitely looks like a bug.
>
> If there's additional data (like the deadlock on
> https://github.com/behlendorf/zfs/issues/232) you should file a bug
> report.
>
>
Can you recommend any other ways of collecting more data? Can I build with
more debug options or something?


> > Although as you can see it can still read from sda, which isn't being
> used
> > by zfs. The drives themselves still work, I can interrogate them with
> > hdparm, for instance.
>
> Have you tried limiting max arc size? I use zfs on a relatively busy
> mysql server (several hundred write tps on Innodb, sync after every
> transaction, SSD), with zfs_arc_max=134217728 and so far it's working
> good.
>

It's enabled now; we'll see if it has any effect.

db48x
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