Date: Tue, 16 Feb 2021 04:58:38 -0500 From: Janos Dohanics <web@3dresearch.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: zpool CKSUM 0 --> 1 while resilvering Message-ID: <20210216045838.2771e7bb04e8aab45092b50a@3dresearch.com> In-Reply-To: <bfa761b8-542a-ea8a-38e2-a255e3349806@holgerdanske.com> References: <20210215131139.c3ad9f9c9f907ee5b058fd37@3dresearch.com> <bfa761b8-542a-ea8a-38e2-a255e3349806@holgerdanske.com>
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On Mon, 15 Feb 2021 12:56:31 -0800 David Christensen <dpchrist@holgerdanske.com> wrote: > On 2021-02-15 10:11, Janos Dohanics wrote: > > [...] > > > > # zpool status > > pool: zroot > > state: ONLINE > > status: One or more devices has experienced an unrecoverable > > error. An attempt was made to correct the error. Applications are > > unaffected. action: Determine if the device needs to be replaced, > > and clear the errors using 'zpool clear' or replace the device with > > 'zpool replace'. see: http://illumos.org/msg/ZFS-8000-9P > > scan: resilvered 1.97T in 0 days 08:25:27 with 0 errors on Mon > > Feb 15 05:09:47 2021 config: > > > > NAME STATE READ WRITE CKSUM > > zroot ONLINE 0 0 0 > > mirror-0 ONLINE 0 0 0 > > ada0p3 ONLINE 0 0 0 > > ada3p3 ONLINE 0 0 1 > > ada2p3 ONLINE 0 0 0 > > > > errors: No known data errors > > > > No errors reported by smartctl(8) for /dev/ada3. > > > > Can I consider this a harmless error and should I just run "zpool > > clear ada3p3'? > > > > Please advise. > > > STFW 'zpool status cksum': > > https://docs.oracle.com/cd/E19120-01/open.solaris/817-2271/gbcve/index.html > > https://docs.oracle.com/cd/E19120-01/open.solaris/817-2271/gbbzs/index.html > > I would: > > 1. Check for interface, cable, and/or rack errors. These should > generate error messages in dmesg(8) and /var/log/messages. I > especially hate red, non-locking SATA cables without any speed > marking. More than a few people agree that the red dye in the > insulation will corrode copper. I have replaced all of my SATA > cables with new black, locking, 6 Gbps SATA cables (made by Cable > Matters). Red SATA cables? I was certainly ignorant about this! > 2. If and when all of the above is okay, I would run SMART short and > long tests on all three drives. (I used to believe in manufacturer > diagnostic tools, but recent experiences with Seagate and Western > Digital have convinced me otherwise; notably when following up with > technical support. If anyone knows of a brand of HDD with good > drives, good diagnostic tools, and good technical support, please > advise.) > > 3. If and when all of the above is okay, I would scrub the pool. > > 4. If and when all of the above is okay and CKSUM remains (#3 might > clear it?), I would do the 'zpool clear ...'. Thank you for the comprehensive advice, I'm glad I asked... -- Janos Dohanics
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