[Gllug] what is causing disk activity ?
Alain Williams
addw at phcomp.co.uk
Thu Nov 20 13:21:26 UTC 2008
On Thu, Nov 20, 2008 at 12:53:07PM +0000, Luke Dudney wrote:
> All of that output refers to stats since boot. For real-time info try
> "iostat -x 5" and wait 5 seconds for the second lot of output
Errrm: I said that I had removed the first block of iostat output. No matter.
> First thing to check would be to see if any processes are blocking on IO:
>
> while true; do ps auwx |awk '$8 ~ /D/'; sleep 1; done
That was interesting. I ran that & walked away for 5 minutes. sda & sdb are SATA disks
that are mirrored (raid 1) providing md1. mdadm shows no problem with it and
nagios would have told me if there was a problem.
I must confess to not understanding how the kernel raid works; is it perhaps writing
status blocks back to disk ?
# while true; do ps auwx |awk '$8 ~ /D/'; sleep 1; done
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
ups 3426 0.0 0.0 37820 684 ? Ds Nov17 0:02 //bin/usbhid-ups -a mintups
root 1908 0.0 0.0 0 0 ? D< Nov17 0:51 [kjournald]
root 4008 0.0 0.0 10188 660 ? D Nov17 0:25 hald-addon-storage: polling /dev/hda
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 477 0.0 0.0 0 0 ? D< Nov17 0:04 [kjournald]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 1889 0.0 0.0 0 0 ? D< Nov17 0:00 [kjournald]
exim 6432 0.3 1.3 168364 55080 ? D 09:46 0:38 spamd child
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 4008 0.0 0.0 10188 660 ? D Nov17 0:25 hald-addon-storage: polling /dev/hda
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 1884 0.0 0.0 0 0 ? D< Nov17 0:00 [kjournald]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 470 0.0 0.0 0 0 ? D< Nov17 2:12 [md1_raid1]
root 4008 0.0 0.0 10188 660 ? D Nov17 0:25 hald-addon-storage: polling /dev/hda
--
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256 http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
Past chairman of UKUUG: http://www.ukuug.org/
#include <std_disclaimer.h>
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