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Date:      Fri, 15 Nov 2019 08:05:24 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 241980] panic: I/O to pool appears to be hung on vdev
Message-ID:  <bug-241980-227-0MZGm9f5dR@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-241980-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-241980-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D241980

--- Comment #1 from Eugene Grosbein <eugen@freebsd.org> ---
The system routinely creates snapshots for ZVOLs and removes old snapshots,=
 so
gstat -adI3s -f 'da[2-6].*' shows that system constandly floods SSDs with A=
TA
TRIM requests.

I decreased kern.cam.da.[2-6].delete_max from default 17179607040 to 262144
after 1.5 days since update to 11.3-STABLE hoping to decrease latency of
read/write operations but it panices again in several hours after that.

--=20
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