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Forum Discussion
BitRot Protection Failure - Anything To Be Done?
12:37:25 AM 01/21/2015 Bit rot protection has detected a silent error within /data/FileHistory/Home/C52893-G/Data/$OF/18143/18144 (2015_01_15 11_11_06 UTC).jpg on /dev/sdc3 and cannot correct the er...
Looking at your smart_history.log I see this
The current pending sector count increases when a sector can't be read. This is a sure sign of disk failure. I see you have now replaced the disk.
The WD20EARX is not on the compatibility list (http://kb.netgear.com/app/answers/detail/a_id/20641). I can see that one of your remaining WD20EARX has a huge load cycle count and the other is fairly new and looks to be heading the same way. You may wish to alter the WDIDLE3 timer interval for these disks.
I think it's quite possible the drive selection played a part in the failure here.
It would be good if you could replace your remaining WD20EARX disks with 4TB WD RED disks when you get the chance (one at a time, wait for resync to complete before you replace the next disk).
RAID, Bitrot protection, unlimited snapshots and anti-virus are great features that help to protect your data but they can never replace the need for backups. Important data should never be trusted to just the one device. There are things like multiple disk failures, fire, flood and theft that can happen.
With bitrot protection we make use of md raid and btrfs checksums to be able to fix some degradation that couldn't be prevented simply using RAID.
model realloc_sect realloc_evnt spin_retry_cnt ioedc cmd_timeouts pending_sect uncorrectable_err ata_errors timestamp time
-------------------- ------------ ------------ -------------- ---------- ------------ ------------ ----------------- ---------- ---------- -------------------
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 0 0 0 1419952644 2014-12-30 15:17:24
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 2 0 0 1421596183 2015-01-18 15:49:43
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 8 0 0 1421596309 2015-01-18 15:51:49
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 20 0 0 1421681764 2015-01-19 15:36:04
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 31 0 0 1421681891 2015-01-19 15:38:11
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 41 0 0 1421682393 2015-01-19 15:46:33
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 49 0 0 1421682519 2015-01-19 15:48:39
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 60 0 0 1421682645 2015-01-19 15:50:45
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 67 0 0 1421682770 2015-01-19 15:52:50
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 70 0 0 1421682896 2015-01-19 15:54:56
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 82 0 0 1421683022 2015-01-19 15:57:02
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 94 0 0 1421683148 2015-01-19 15:59:08
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 108 0 0 1421683274 2015-01-19 16:01:14
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 112 0 0 1421683400 2015-01-19 16:03:20
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 125 0 0 1421684154 2015-01-19 16:15:54
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 128 0 0 1421684401 2015-01-19 16:20:01
WDC WD20EARX-00ZUDB0 0 0 0 -1 -1 128 128 0 1421731811 2015-01-20 05:30:11
WDC WD40EFRX-68WT0N0 0 0 0 -1 -1 0 0 0 1421805835 2015-01-21 02:03:55
The current pending sector count increases when a sector can't be read. This is a sure sign of disk failure. I see you have now replaced the disk.
The WD20EARX is not on the compatibility list (http://kb.netgear.com/app/answers/detail/a_id/20641). I can see that one of your remaining WD20EARX has a huge load cycle count and the other is fairly new and looks to be heading the same way. You may wish to alter the WDIDLE3 timer interval for these disks.
I think it's quite possible the drive selection played a part in the failure here.
It would be good if you could replace your remaining WD20EARX disks with 4TB WD RED disks when you get the chance (one at a time, wait for resync to complete before you replace the next disk).
RAID, Bitrot protection, unlimited snapshots and anti-virus are great features that help to protect your data but they can never replace the need for backups. Important data should never be trusted to just the one device. There are things like multiple disk failures, fire, flood and theft that can happen.
With bitrot protection we make use of md raid and btrfs checksums to be able to fix some degradation that couldn't be prevented simply using RAID.
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