hast and zfs trim possibly causing some problems in 9.2

[Steven Hartland]

ZFS will try to send DELETE requests to the underlying storage to
support TRIM. If that fails then it will disable TRIM support for
that vdev.

My guess would be you're just seeing hast being a bit verbose
when these initial batch failures happen.

    Regards
    Steve

----- Original Message ----- 
From: "Pete French" <petefrench at ingresso.co.uk>
To: <freebsd-stable at freebsd.org>
Sent: Wednesday, October 09, 2013 3:25 PM
Subject: hast and zfs trim possibly causing some problems in 9.2


>I just had a machine fall over on my for the first time in ages - one
> of a pair of machine we have running hast with zfs on top. I havent
> got any concrete evidence of what made it die as yet, but I
> did notice the logifles filling up with thoursands of lines like this
> just prior to the crash:
> 
> serpentine-active hastd[1522]: [serp1] (primary) Remote request failed (Operation not supported): DELETE(26847744000, 1536).
> 
> so I am guessing taht is ZFS trying to send a trim command to hast, and hast
> does not support it. Have disabled zfs trim now, but thought it was
> worth mentioning - I would have not expected zfs to be trying to issue
> a trim command to an underlying device which doesnt support it. These
> machines were rock solid under 8, and the only chnage I can see with 9 is
> the trim support being added.
> 
> cheers,
> 
> -pete.
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