Originally posted by: sajid1

AIX 5.3

I need to know which particular process is taking top most I/O utilization and also ten top most processes I/O utilization.

Thanks

Originally posted by: SystemAdmin

Hi,

Try to use this command...

1. ps aux|head -1; ps aux|sort -rn +3

Regards

Originally posted by: sajid1

Many thanks for responding.

That provided command is giving more than 50 outputs how could i understand which one is taking most utilization?
if possible provide top 10 most utilization of I/O

Originally posted by: sajid1

Find below output while hdisk6 utilization is 100%. please update from which column i can understand that which process is taking top I/O.

$topas

Disk Busy% KBPS TPS KB-Read KB-Writ
dac1 0.0 10.8K 459.0 6728.0 4298.0
hdisk6 100.5 10.3K 445.0 6700.0 3824.0
hdisk5 4.5 502.0 14.0 28.0 474.0
hdisk0 0.0 0.0 0.0 0.0 0.0
$ ps aux|head -1; ps aux|sort -rn +3 | head -10
USER PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND
oretail 1122396 0.0 1.0 113008 112484 - A Jun 17 12:10 java -DAGENT=RM
oracle 5370062 0.0 1.0 239620 197596 - A 10:46:39 1:35 oraclerps (LOCA
oracle 983266 0.0 1.0 141532 99444 - A Jun 17 0:17 oraclerps (LOCA
root 6648032 0.0 0.0 1032 792 - A 16:43:37 0:00 sshd: oretail [
root 6484084 0.0 0.0 1032 816 - A 07:41:37 0:00 sshd: oretail [
root 6029332 0.0 0.0 704 728 - A Jun 18 0:00 telnetd -a
root 4546732 0.0 0.0 448 448 - A Jun 17 0:05 aioserver
root 4542634 0.0 0.0 448 448 - A Jun 17 0:03 aioserver
root 4538536 0.0 0.0 448 448 - A Jun 17 0:09 aioserver
root 4534438 0.0 0.0 448 448 - A Jun 17 0:08 aioserver
Thanks

Originally posted by: sajid1

Please reply

Originally posted by: krishnacbhatt

ps aux|head -1; ps aux|sort -rn +3

are these 2 different commands or a single one??

also what does the x option does in the ps command??

and please explain the use of sort -rn +3 here...

Originally posted by: Tibor_B

Hi,
I wonder if there is user-friendly way to show processes with biggest io (like iotop on linux), but if you have a list of disks with highest IO from f.e. sar command, you can use lsof to find out processes that are using them.

Though things are not that simple, as I looked on output of lsof, it lists information based on logical volumes, not directly hardrives.
To list logival volumes on your hardrive try

lspv -l $hdisk

Once you have logical volume try this:

lslv -l $lv

I believe you can have logical volume spread over multiple disks (it would be better if lv was only on single hardive, of course)

And the final step is simple

lsof | grep $lv

to see what processes are accessing the logical volume

I hope it will be of use for you

Regards

Originally posted by: sajid1

I believe you can have logical volume spread over multiple disks
--no, All logical volume(where oracle database and datafile are located) on a single disk

Thanks