On Tue, Jun 19, 2012 at 09:45:28AM +0900, Ryan Lee wrote:
> Hi, My name is Ryan.
> Nowadays, Our company product has a new problem which is taking too much
> time to delete file on xfs filesystem.
> When I try to delete the file (18GByte, It was just one file), it would
> take around 7 minutes 30 seconds.
It's fragmented, isn't it? Run 'xfs_bmap -vp <file>' and count the
extents. If that fails because of ENOMEM errors, run 'xfs_io -f -c
stat <file>' to see what the count of extents is. if the result is
in the thousands, then that is the reason for it being slow.
> # time rm hdd_write_test6.ts
Hmmm - a loopback filesystem image that was written to randomly?
Perhaps you should preallocate the file before running the write
> kernel 2.6.37
A current kernel (e.g. 3.4) will be significantly faster at removing
fragmented files than 2.6.37. Consider upgrading.