Romanowski, John (OFT) wrote:
I'm looking into this question because "iostat -p ALL" reports that 30%
of the dasd blks written for the server are being written to the root
partition; I'm not expecting so much write activity to the root
partition.
Especially with /var /tmp /opt /home on separate filesystems.
Maybe iostat is misleading me? Kernel is SLES 9 2.6.5-7.191-s390
My ls -al / output tells me /tmp was updated today and not much else
changed on the root partition since booting on Aug 4 around 22:14
drwxr-xr-x 2 root root 4096 Jan 10 2006 bin
drwxr-xr-x 3 root root 4096 Jan 10 2006 boot
drwxr-xr-x 14 root root 77824 Aug 4 22:15 dev
drwxr-xr-x 64 root root 4096 Aug 9 03:03 etc
drwxr-xr-x 5 root root 4096 May 4 12:10 home
drwxr-xr-x 11 root root 4096 Jan 10 2006 lib
drwx------ 2 root root 4096 Apr 21 21:42 lost+found
drwxr-xr-- 2 root root 4096 Jan 10 2006 mnt
drwxr-xr-x 3 root root 4096 Feb 2 2006 oft
drwxr-xr-x 7 root root 4096 Jun 9 2005 opt
dr-xr-xr-x 116 root root 0 Aug 4 22:14 proc
drwx------ 12 root root 4096 Mar 16 10:48 root
drwxr-xr-x 3 root root 8192 Feb 21 10:10 sbin
drwxr-xr-x 4 root root 4096 May 2 2005 srv
drwxr-xr-x 7 root root 0 Aug 4 22:14 sys
drwxrwxrwt 32 root root 4096 Aug 11 12:16 tmp
drwxr-xr-x 14 root root 4096 Jan 10 2006 usr
drwxr-xr-x 15 root root 4096 Jun 9 2005 var
iostat -p ALL (this reports totals since boot time; 6 days ago)
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
dasda 0.27 0.29 6.87 161760 3863424
dasda1 0.88 0.28 6.87 160120 3863416
dasda2 0.00 0.00 0.00 1568 0
dasdb 0.14 0.34 1.35 193224 756528
dasdb1 0.19 0.34 1.35 193152 756528
dasdc 0.85 1.49 11.35 835696 6379616
dasdc1 1.54 1.49 11.35 835624 6379616
My calc says dasda1 (my root partition) did about 30% of the server's
Blk_wrtn; Given my setup I can't figure out where all that write I/O is
too or for/
Likely active things in / on suse:
/var/tmp
/var/log
/var/lib/samba
/var/lib/mysql
/srv (where all the web & ftp stuff is by default)
This is assuming you haven't broken out these directories onto separate
disks/filesystems. Also, depending on how you've set it up, dsmc may
have a nohup file in / as well.
Check and make sure the filesystem isn't mounted with the "sync" option,
also.
Another thing, check the /etc/cron.* directories for unnecessary default
cron jobs. There are things in there that run that can be very disk I/O
intensive that you may not need or want.
*Brandon Darbro
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