Re: [Moosefs-users] chunk with bad crc

[jyc <mai...@gm...>]

I reply to myself.
did a memtest on the server.
the bios was ECC enabled, but the memory was not capable.
memtest return once a mistake.

idem est : bad crc.

my conclusion : don't test moosefs on too old hardware :-)

jyc wrote:
> Hi everyone,
>
> i have a cluster with 4 chunkservers with moosefs.
> on one server, i got this problem :
>
> i had many filesystem check info with no problem.
> but now, i get one chunk with a goal of one, and a valid copie of zero.
>
> in the log, I get :
>
> but now Jun 28 14:53:39 read_block_from_chunk:
> file:/opt/ba1d3/mfs/2B/chunk_000000000000962B_00000001.mfs - crc error
>
> but the file  was written five days before :
>
> mfs mfs 65M jun 23 03:04
> /opt/ba1d3/mfs/2B/chunk_000000000000962B_00000001.mfs
>
> can you explain me why this chunk was correct for five days, and now it
> seems that it is not ?
>
> by the way, what process do the crc ?
> is it the mfschunkserver that check it (I think it must be) where is
> stored the "correct" crc ? in the mfsmaster process/file ?
>
> (on this server, i got 4 hdds, all with xfs filesystem. i changed the
> motherboard. system is still the same after changing the motherboard.
> kernel 2.6.26-2-686 )
>
> any clue ?
>
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