On 4/23/07, Robert Milkowski <[EMAIL PROTECTED]> wrote:
Relatively low traffic to the pool but sync takes too long to complete
and other operations are also not that fast.

Disks are on 3510 array. zil_disable=1.


bash-3.00# ptime sync

real     1:21.569
user        0.001
sys         0.027
Hey, that is *quick*!

On Friday afternoon I typed sync mid-afternoon. Nothing had happened
a couple of hours later when I went home. It looked as though it had finished
by 11pm, when I checked in from home.

This was on a thumper running S10U3. As far as I could tell, all writes
to the pool stopped completely. There were applications trying to write,
but they had just stopped (and picked up later in the evening). A fairly
consistent few hundred K per second of reads; no writes; and pretty low
system load.

It did recover, but write latencies of a few hours is rather undesirable.

What on earth was it doing?

--
-Peter Tribble
http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/
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