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Date:      Sat, 02 Feb 2019 09:05:17 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 235419] zpool scrub progress does not change for hours, heavy disk activity still present
Message-ID:  <bug-235419-227-PbYeteZHHg@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235419-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235419-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235419

Michael La=C3=9F <bevan@bi-co.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bevan@bi-co.net

--- Comment #1 from Michael La=C3=9F <bevan@bi-co.net> ---
Did you have a look at what kind of disk activity there was?

I experienced a very similar issue during my latest scrub: It was hanging b=
ut
there was still lots of IOPS on the disks. However, the throughput accordin=
g to
gstat was only roughly 1MB/s. This is actually more than the throughput sho=
wn
by "zpool scrub status" which was down in the KB/s region.

I stopped the scrub, rebooted the machine and restarted scrub and it finish=
ed
without problems.

I only experienced this after upgrading to 12.0-RELEASE. I thought it may be
related to the new sequential scrub feature that fails to perform under cer=
tain
constraints (e.g., memory pressure) but that wasn't present in 11.2 as far =
as I
know.

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