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Should I worry about "bit rot" with no visable drive errors?
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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.
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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.
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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.
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Re: Should I worry about "bit rot" with no visable drive errors?
Also, which firmware are you running?
Do you recall which firmware you were running when you added these files?
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Re: Should I worry about "bit rot" with no visable drive errors?
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.
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Re: Should I worry about "bit rot" with no visable drive errors?
Yes, definitely bit-rot has occurred.
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Re: Should I worry about "bit rot" with no visable drive errors?
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.
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Re: Should I worry about "bit rot" with no visable drive errors?
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.