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Date:      Fri, 17 Nov 2017 17:33:55 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 178473] gmultipath(8) needs to be smarter about errors
Message-ID:  <bug-178473-8-GgZe54Pd7p@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-178473-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-178473-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D178473

Richard Kunert <rkunert@wisc.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rkunert@wisc.edu

--- Comment #4 from Richard Kunert <rkunert@wisc.edu> ---
I think what is needed is a gmultipath equivalent to the no_path_retry sett=
ing
in DM Multipath on Linux, which allows specifying the number of retries bef=
ore
the queue is released and the I/O fails. I assume that would allow ZFS to
realize that something is wrong. Retrying forever is not always a rational =
or
useful behavior.

no_path_retry:
A numeric value for this attribute specifies the number of times the system
should attempt to use a failed path before disabling queuing.
A value of fail indicates immediate failure, without queuing.
A value of queue indicates that queuing should not stop until the path is
fixed.

I just set up a new FreeBSD server with dual HBAs, dual SAS expander
backplanes, etc., using gmultipath. I am on the verge of migrating the serv=
er
to Ubuntu and ZFS on Linux just to avoid this issue - particularly seeing t=
hat
it was reported years ago and there has been no movement.

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