Re: Very slow filesystem

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Oct 25, 2013 at 10:40:36AM +0100, Stephen Borrill wrote:
> I've a machine which has a filesysmte that is extremely slow to
> create dirs and files. Look at the time to run mkdir below:
> 
> backup 1# time mkdir /data/backup/previous4
> 0.000u 0.131s 1:31.95 0.1%      0+0k 7912+5io 0pf+0w
> backup 2# df -hi
> Filesystem        Size       Used      Avail %Cap    iUsed   iAvail
> %iCap Mounted on
> /dev/sd0a         5.9G       1.6G       4.0G  28%    81236   689066  10% /
> /dev/raid0d       7.2T       6.0T       853G  87%  7004623 474545967
> 1% /data
> tmpfs             2.2G       8.0K       2.2G   0%       14 16612892
> 0% /tmp
> kernfs            1.0K       1.0K         0B 100%        0        0
> 0% /kern
> ptyfs             1.0K       1.0K         0B 100%        0        0
> 0% /dev/pts
> procfs            4.0K       4.0K         0B 100%       49      995
> 4% /proc
> backup 3# time rmdir /data/backup/previous4
> 0.000u 0.001s 0:00.06 0.0%      0+0k 1+6io 0pf+0w
> backup 4# uname -a
> NetBSD backup 6.1_STABLE NetBSD 6.1_STABLE (MONOLITHIC) #5: Wed Oct
> 23 15:10:22 BST 2013 
> root%builder.internal.precedence.co.uk@localhost:/usr/obj/6.0/i386/sys/arch/i386/compile/MONOLITHIC
> i386
> 
> Filesystem is completely idle. It's on a 5-disk RAID 5 RAIDframe
> array. fsck reports no problems. WAPBL is not enabled.
> 
> Creating a new top-level directory in the mount is OK, but it is
> very slow in any subdir of the backup directory (which contains
> probably 95% of the data).

What disk is it, and what are the filesystem parameters (dumpfs output) ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--