[Moosefs-users] chunk with bad crc

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

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 ?