Date: Mon, 15 Feb 2021 13:11:39 -0500 From: Janos Dohanics <web@3dresearch.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: zpool CKSUM 0 --> 1 while resilvering Message-ID: <20210215131139.c3ad9f9c9f907ee5b058fd37@3dresearch.com>
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Hello, I had to replace a hard drive which has failed a smart test. As the replacement hard drive was being resilvered, I have peridically checked the progress. Initially, everything looked fine: # zpool status pool: zroot state: ONLINE status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Sun Feb 14 20:44:20 2021 1.77T scanned at 291M/s, 179G issued at 28.7M/s, 1.97T total 179G resilvered, 8.88% done, 0 days 18:12:23 to go config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ada0p3 ONLINE 0 0 0 replacing-1 ONLINE 0 0 0 ada1p3 ONLINE 0 0 0 ada3p3 ONLINE 0 0 0 ada2p3 ONLINE 0 0 0 errors: No known data errors But a little later CKSUM changed from 0 to 1: # zpool status pool: zroot state: ONLINE status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Sun Feb 14 20:44:20 2021 1.84T scanned at 249M/s, 275G issued at 36.5M/s, 1.97T total 275G resilvered, 13.65% done, 0 days 13:35:00 to go config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ada0p3 ONLINE 0 0 0 replacing-1 ONLINE 0 0 0 ada1p3 ONLINE 0 0 0 ada3p3 ONLINE 0 0 1 ada2p3 ONLINE 0 0 0 errors: No known data errors After resilvering has finished: # 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. -- Janos Dohanics
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