[Gluster-users] how to verify bitrot signed file manually?

[Amudhan P]

ok, from bitrot code I figured out gluster using sha256 hashing algo.


Now coming to the problem, during scrub run in my cluster some of my files
were marked as bad in few set of nodes.
I just wanted to confirm bad file. so, I have used "sha256sum" tool in
Linux to manually get file hash.

here is the result.

file-1, file-2 marked as bad by scrub and file-3 is healthy.

file-1 sha256 and bitrot signature value matches but still it's been marked
as bad.

file-2 sha256 and bitrot signature value don't match, could be a victim of
bitrot or bitflip.file is still readable without any issue and no errors
found in the drive.

file-3 sha256 and bitrot signature matches and healthy.


file-1 output from

"sha256sum" =
"71eada9352b1352aaef0f806d3d561768ce2df905ded1668f665e06eca2d0bd4"


"getfattr -m. -e hex -d "
# file: file-1
trusted.bit-rot.bad-file=0x3100
trusted.bit-rot.signature=0x01020000000000000071eada9352b1352aaef0f806d3d561768ce2df905ded1668f665e06eca2d0bd4
trusted.bit-rot.version=0x020000000000000058e4f3b40006793d
trusted.ec.config=0x0000080a02000200
trusted.ec.dirty=0x00000000000000000000000000000000
trusted.ec.size=0x0000000718996701
trusted.ec.version=0x0000000000038c4c0000000000038c4d
trusted.gfid=0xf078a24134fe4f9bb953eca8c28dea9a

output scrub log:
[2017-09-02 13:02:20.311160] A [MSGID: 118023]
[bit-rot-scrub.c:244:bitd_compare_ckum] 0-qubevaultdr-bit-rot-0: CORRUPTION
DETECTED: Object /file-1 {Brick: /media/disk16/brick16 | GFID:
f078a241-34fe-4f9b-b953-eca8c28dea9a}
[2017-09-02 13:02:20.311579] A [MSGID: 118024]
[bit-rot-scrub.c:264:bitd_compare_ckum] 0-qubevaultdr-bit-rot-0: Marking
/file-1 [GFID: f078a241-34fe-4f9b-b953-eca8c28dea9a | Brick:
/media/disk16/brick16] as corrupted..

file-2 output from

"sha256sum" =
"c41ef9c81faed4f3e6010ea67984c3cfefd842f98ee342939151f9250972dcda"


"getfattr -m. -e hex -d "
# file: file-2
trusted.bit-rot.bad-file=0x3100
trusted.bit-rot.signature=0x0102000000000000009162cb17d4f0bee676fcb7830c5286d05b8e8940d14f3d117cb90b7b1defc129
trusted.bit-rot.version=0x020000000000000058e4f3b400019bb2
trusted.ec.config=0x0000080a02000200
trusted.ec.dirty=0x00000000000000000000000000000000
trusted.ec.size=0x00000000403433f6
trusted.ec.version=0x000000000000201a000000000000201b
trusted.gfid=0xa50012b0a632477c99232313928d239a

output scrub log:
[2017-09-02 05:18:14.003156] A [MSGID: 118023]
[bit-rot-scrub.c:244:bitd_compare_ckum] 0-qubevaultdr-bit-rot-0: CORRUPTION
DETECTED: Object /file-2 {Brick: /media/disk13/brick13 | GFID:
a50012b0-a632-477c-9923-2313928d239a}
[2017-09-02 05:18:14.006629] A [MSGID: 118024]
[bit-rot-scrub.c:264:bitd_compare_ckum] 0-qubevaultdr-bit-rot-0: Marking
/file-2 [GFID: a50012b0-a632-477c-9923-2313928d239a | Brick:
/media/disk13/brick13] as corrupted..


file-3 output from

"sha256sum" =
"a590735b3c8936cc7ca9835128a19c38a3f79c8fd53fddc031a9349b7e273f27"


"getfattr -m. -e hex -d "
# file: file-3
trusted.bit-rot.signature=0x010200000000000000a590735b3c8936cc7ca9835128a19c38a3f79c8fd53fddc031a9349b7e273f27
trusted.bit-rot.version=0x020000000000000058e4f3b400019bb2
trusted.ec.config=0x0000080a02000200
trusted.ec.dirty=0x00000000000000000000000000000000
trusted.ec.size=0x000000003530fc96
trusted.ec.version=0x0000000000001a980000000000001a99
trusted.gfid=0x10d8920e42cd42cf9448b8bf3941c192



most of the bitrot bad files are in the set of new nodes and data were
uploaded using gluster 3.10.1. no drive issues are any kind of error msgs
in logs.

what could be gone wrong?

regards
Amudhan

On Thu, Sep 21, 2017 at 1:23 PM, Amudhan P <amudhan83 at gmail.com> wrote:

> Hi,
>
> I have a file in my brick which was signed by bitrot and latter when
> running scrub it was marked as bad.
>
> Now, I want to verify file again manually. just to clarify my doubt
>
> how can I do this?
>
>
> regards
> Amudhan
>
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