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Should I worry about "bit rot" with no visable drive errors?
Running my monthly scrub 25% of the way through I've seen 4 reports of bitrot from files I confirmed viable before transfering to my NAS over ethernet. There are literally 0 disk errors or warnings and the filesystem passed a scan on Sunday. I have the files backed up so removing and replacing them is a non-issue. Should there be any concern with this sort of thing unless I see a continuing trend? Or could it be as I assume a failed copy over ethernet as they were transfered around the same period of time IE within a couple weeks. Thanks for any info.
Wed Sep 2 2015 15:29:01
Volume: Bit rot protection has detected an error within /var/ftp/*****/*****/*****/*****/*****.mkv and cannot correct the error.
Wed Sep 2 2015 15:15:20
Volume: Bit rot protection has detected an error within /var/ftp/*****/*****/*****/*****/*****.mp4 and cannot correct the error.
Wed Sep 2 2015 9:54:25
Volume: Bit rot protection has detected an error within /var/ftp/*****/*****/*****/*****/*****.mkv and cannot correct the error.
Wed Sep 2 2015 5:42:53
Volume: Bit rot protection has detected an error within /var/ftp/*****/*****/*****/*****/*****.mkv and cannot correct the error.
I'd do a binary compare of your backup files and the ones on the NAS, and see if they are actually different. Please post back either way.
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I'd do a binary compare of your backup files and the ones on the NAS, and see if they are actually different. Please post back either way.
Also, which firmware are you running?
Do you recall which firmware you were running when you added these files?
I did a CRC check from the NAS files to my backup and they're totally off.
Attempts to copy from the NAS filesystem (on these 4 files only) gives an Input/output error via CLI on my desktop Linux system.
Any other files that I've randomly tested pass CRC and playback tests just fine. So that's fantastic. :)
Firmware version is 6.2.4 currently and at the time of transfer.
My scrub still has a day or so left so I'll note any further failures that I come across.
Found one more bit rot file from the same time period.
Removed all 5 files total and after a disk scan I'll be copying them back from my archives after a disk scan and updating with any additional problems that surface if any.
After replacing the damaged files I have scanned the disks twice, balanced, and done another scrub for good measure. So far so good. Looks like it was simply a few bad transfers that never got noticed.
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