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Date:      Sun, 30 Oct 2016 10:52:46 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 213915] [zfs] lots of CKSUM errors and sometimes even 'unkown error 122'
Message-ID:  <bug-213915-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213915

            Bug ID: 213915
           Summary: [zfs] lots of CKSUM errors and sometimes even 'unkown
                    error 122'
           Product: Base System
           Version: 10.3-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: k_georgiev@deltanews.bg
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

FreeBSD VMWare virtual machine - zpool CKSUM counter keeps growing with over
10K errors per day. Sometimes get permanent damaged files with error 122.=20

Noticed on 3 systems with high I/O load so far. One of them is FreeBSD 10.1,
the other 2 are FreeBSD 10.3.=20

Issue is reproduced on both local and iSCSI storage. It also reproduces with
disk is attached via RDM (raw device mapping) and even it it's attached via
FreeBSD iscsid.=20

Not sure what causes it, because I have no clear log of ZFS CKSUM errors, b=
ut
it happens only on system with very high disk load. All underlying storage
devices I've tried to migrate the VMs on did not report any disk, or network
errors.=20


Investigation steps taken are described in this forum thread:
https://forums.freebsd.org/threads/58282/

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