I have a strange situation with a box which has a mail spool
directory which is rsynced on a daily basis to a standby box. The
directory uses about 12GB (12320MB) on the original box and about
13GB (13154MB) on the standby box. I am puzzled as to why this is.
Each filesystem is ext3, and the blocksize on each is the default
4096 bytes. There are no dot files to be seen. If I do du -sm . * in
each directory, the output is identical except for the first line
i.e. the corresponding subdirectories on prime and standby systems
show the exact same size, but the containing directory somehow gains
800MB on the standby box.
On the prime system the filesystem is on a hardware SCSI RAID disk,
whereas on the standby it's a Linux MD RAID, but I can't see why that
would have any influence.
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