Viewing disk I/O at the file level?

[Joshua McCarthy]

I am having a Disk bottleneck and I am wondering if there is a way for me to view what files are being used the most. I am able to view which volumes are in high use, but it would be far more helpful to know what particular file is causing the problem. Any thoughts would be much appreciated.

Thanks

[Coolmar]

Have you tried "lsof", you would have to download it but it might help.

You can get it from here: http://hpux.cs.utah.edu/

[Dave Olker]

Hi Joshua,

Do you know which process/thread is performing the I/O? If so you can use tusc to attach to the thread and see which files it is accessing for reads/writes/etc.

Regards,

Dave

[James R. Ferguson]

Hi Joshua:

If you use Glance you can watch the offset of an open file grow. This could help point you to your candidates.

You will need to select (guess) the process in question and having done so, drill-down to its open files.

Regards!

...JRF...

[Michael Steele_2]

Use 'sar -d 5 5' and 'pvdisplay'. In the 'sar' report, note any disk where avwait is greater than 'avserv'. Note those device names and use 'pvdisplay -v /dev/dsk/...." to see what logical volumes are using that disk. Cross reference with 'bdf' or /etc/fstab.