Strange delete performance using XFS
Hi,
I've got a strange problem on one machine using XFS. Deleting large
directories (containing about 100000 files, 20k each) using "rm -rf"
lasts nearly as long as creating the the files using a bash loop.
The machine is running Debian Sarge with a vanilla 2.6.20.3 kernel.
CPU: Dual Xeon(TM) CPU 3.20GHz
RAM: 4 GB
RAID10: 4x 320 GB disks connected to 3ware 9550SXU-8LP
(Firmware Version = FE9X 3.08.00.004)
The XFS was created using default options.
Has anyone realized similar effects? On a different server (Dell 6850)
the directory can be deleted within seconds. What could be the reason
for the huge difference in delete performance?
Please see below for "time" output.
| # time for i in `seq 1 100000`; do dd if=/dev/zero of=$i bs=1k count=20 >/dev/null 2>&1; done
|
| real 6m6.814s
| user 0m30.290s
| sys 2m42.562s
| # time rm -rf y
|
| real 5m18.034s
| user 0m0.036s
| sys 0m8.169s
In contrast to this the result on the Dell machine looks more
reasonable:
| # time for i in `seq 1 100000`; do dd if=/dev/zero of=$i bs=1k count=20 >/dev/null 2>&1; done
|
| real 9m26.658s
| user 0m24.134s
| sys 3m3.623s
| # time rm -rf x
|
| real 0m10.254s
| user 0m0.124s
| sys 0m10.105s
Ciao,
Thomas
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