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Hello all

Running rsync -vvac I kept getting checksum mismatches. Trying
to isolate the cause, I was faced with this:

[root@njoerd lsat]# md5sum 006069_15meROT.tif
0ce8093accb771c66a0154b4d55fd90b  006069_15meROT.tif
[root@njoerd lsat]# md5sum 006069_15meROT.tif
fc2caf002b693c1283a10536fa976358  006069_15meROT.tif
[root@njoerd lsat]# md5sum 006069_15meROT.tif
9ff9da9e1759caa50a5145b668ef9231  006069_15meROT.tif
[root@njoerd lsat]# mv 006069_15meROT.tif /root/
[root@njoerd lsat]# cd /root/
[root@njoerd ~]# md5sum 006069_15meROT.tif
80ff8ae8dc281288ec2ece20f9d4087a  006069_15meROT.tif
[root@njoerd ~]# md5sum 006069_15meROT.tif
80ff8ae8dc281288ec2ece20f9d4087a  006069_15meROT.tif
[root@njoerd ~]# md5sum 006069_15meROT.tif
80ff8ae8dc281288ec2ece20f9d4087a  006069_15meROT.tif

The directories lsat and root are on the same drive, on different
partitions. lsat is encrypted with dm-crypt (twofish), root is not.
I've tested the RAM as best I could and it seems to be good. fsck
reports "all well" and the problem manifests itself anywhere on
the partition, not in any one specific place.

This happens all the time and it only happens with big files. For
instance, this tiff is 680 MB. The system is centos 4.3 running
kernel 2.6.9-34.0.2.EL (with redhat backporting things kernel
versions mean very little, but at least it's surely newer than
2.6.4-rc2).

Could it be dm-crypt glitching? Has anyone seen anything similar?
In about two years of routinely using dm-crypt I've never had file
corruption or any similar oddities before. Then again, I don't know
what else I could blame for the md5sum nuttiness above.

Z



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