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5d5 checksum inconsistent
04-21-2016, 11:40 AM
Post: #1
5d5 checksum inconsistent
I have 2 drobo5d's that both exhibit a bizarre behaviour.
via either usb or thunderbolt, copy a 2 gb file to the drobo.
run the md5 checksum utility on it-
md5 /drobo5d/big_huge_file.iso
you get checksum-XXXXXXXXXX
run md5 again on the same file, you get a different checksum.
run again? different checksum

This is true for all large files on both drobo's. if you check smaller files 1-10mb- sometimes you get corruption sometimes you don't.

anyone else seen this and what is going on ?

I'm guessing bad controller hardware or bad ram on the drobo itself?

Files on other disks do not exhibit this issue, sadly, it has corrupted TB's of source footage.
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04-21-2016, 03:48 PM
Post: #2
RE: 5d5 checksum inconsistent
hi, would you be able to try a similar test using quickpar if you get a chance please?
it would be interesting to see how the quick par verification compares (both with a forced refresh on the same file in the same location, but also compared with the same file on both drobos tested with the same parity set)

i think the only time i have seen erroneous blocks was when i copied from drobo to usb stick (or from my computer to usb stick) and when i copied from the usb stick to another computer (or a drobo) but this was becuase the usb stick had faulty/failiing cells.... (i still have that usb stick, but as a basic transfer usb so i always try to create say 5% extra parity to cater for the failing blocks)

(i did have some corruption happen when i "moved" files off a camera simcard to another location drobo and computer, but that before i learned the lesson to never move off those cards, and to instead, copy paste and verify)

(btw i have XP home SP2, a Drobo v1 with 2x 1TB/2x 1.5TB WD greens, & a bkp Drobo v2 with the same + a DroboShare: unused)
& a DroboS v2 with 3xWD15EADS &2x1TB in DDR mode on win7, & a drobo5D (all usb)
  • btw i did a sustained (write) operation for about 6 hours, and got 13.2MB / sec ...objection? "sustained" :)
    (16.7MB/s on a v2 & 47-96MB/s drobo-s)
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