Fragmentation on XFS
robbosch at msn.com
Mon Feb 25 16:14:47 GMT 2008
> Any idea why Glibc's posix_fallocate makes any difference?
> Doesn't it simply write a lot of zeros? In that case, why doesn't
> rsync writing lots of data sequentially result in the same number of
The destination server had a lot of other processes running at the same
time. I suspect this concurrency is causing the additional extents since
many processes writing to the same disk array.
I thought only 1235 extents without posix_fallocate was pretty good. Under
cygwin and NTFS, an equivalent file was generating around 25000 extents.
More information about the rsync