AIX

Hi,

Is there any command that I can issue to check who is actively using my harddisk? I notice that yesterday the hdisk0 and hdisk1 is really actively being used and is reaching almost 100%. I realized that this is because of paging which is climbing up to 70%.

However, just this morning I see paging is at 7% but still the hdisk0 and hdisk1 is high. Any thoughts?

Thanks.

You mean the %tm_act from iostat or other monitoring tools?
Best show us an excerpt of

Code:

iostat -d 1 20

while this peak/busy behaviour occurs. Also a

Code:

vmstat 1 20

might come handy.

You could use the too filemon to try to locate at least the LV(s) and file(s) that is/are affected.
Example from man page:

Code:

filemon -o fmon.out -O all

Best check the man page for it. When launching it you can stop it after some seconds or minutes of busy disk time with

Code:

trcstop

Should be also covered in the Performance Tools Redbook from IBM.
If you found the LV/FS or file you could also check with fuser or lsof which process might be related.

Hi zaxxon,

Thanks for the prompt reply. I will try this tomorrow.

Np, I added some info to my post that you might have missed reading it while I edited it again