This is actually a recently known problem, and a fix for it is in the
3.1 version, which should be available any minute now, if it isn't
already available.
The problem has to do with some allocations which are sleeping, and jobs
in the ZFS subsystem get backed behind some other work.
If you have adequate system memory, you are less likely to see this
problem, I think.
- Garrett
On Tue, 2011-07-26 at 08:29 -0700, Rocky Shek wrote:
> Ian,
>
> Did you enable DeDup?
>
> Rocky
>
>
> -----Original Message-----
> From: zfs-discuss-boun...@opensolaris.org
> [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of Ian D
> Sent: Tuesday, July 26, 2011 7:52 AM
> To: zfs-discuss@opensolaris.org
> Subject: [zfs-discuss] Entire client hangs every few seconds
>
> Hi all-
> We've been experiencing a very strange problem for two days now.
>
> We have three client (Linux boxes) connected to a ZFS box (Nexenta) via
> iSCSI. Every few seconds (seems random), iostats shows the clients go from
> an normal 80K+ IOPS to zero. It lasts up to a few seconds and things are
> fine again. When that happens, I/Os on the local disks stops too, even the
> totally unrelated ones. How can that be? All three clients show the same
> pattern and everything was fine prior to Sunday. Nothing has changed on
> neither the clients or the server. The ZFS box is not even close to be
> saturated, nor the network.
>
> We don't even know where to start... any advices?
> Ian
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