ZFS hang status update

[Dennis Glatting]

On Sat, 2012-10-20 at 10:41 +0300, Andriy Gapon wrote:
> on 20/10/2012 08:38 Dennis Glatting said the following:
> > This is da0 (the cache --SSD) on which camcontrol hanged. It is on the
> > same controller.
> 
> Hmm, hanging camcontrol is a bad sign.  It would be interesting to get procstat
> -k information just for the hanging camcontrol process.
> Also, is it possible to eliminate this disk from the configuration?
> 

Attached (I hope but also found here:
http://www.pki2.com/zfs_stats_efficiency-week.png) is a munin graph of
"ZFS ARC Efficiency - by week" for the server I have been talking about.
You will notice before each crash the prefetch efficiency is going down.

This graph is for daily graph.
http://www.pki2.com/zfs_stats_efficiency-day.png