On 10/14/2011 02:13 AM, Frank Steiner wrote:
Hi,
we do a 1:1 backup from our main raid to a backup raid every night with
rsync -a --delete /mnt/raid1/ /mnt/raid2
rsync is 3.09, filesystems are ext3, OS is SLES 11 SP1.
The rsync process takes several hours, even if no file has changed at all.
Using -vv I see that rsync compares all files every time and that takes
long for some hundreds of millions of small files.
Can I tell rsync it should not compare files in a directory if the
directory has not changed, i.e., ctime is the same in source and target?
I.e., when I have a dir x with a subdir y and a file y1 in it, I see:
rsync -avv x z
created directory z
delta-transmission disabled for local transfer or --whole-file
x/
x/y/
x/y/y1
on the first run and
rsync -avv x z
x/y/y1 is uptodate
on every following run. Why does rsync compare y1 again?
I couldn't find a solution in the mailing list or FAQ and when googling.
I found a mail in this list telling that -a was the culprit and one
should add -O to fix it, but it doesn't make any difference.
cu,
Frank
Perhaps using the ext3 dirindex option would help?
--
-Eric 'shubes'
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