topic Re: Disk I/O Utlisation in Operating System - HP-UX

Disk I/O Utlisation

John Jayaseelan — Fri, 05 Dec 2003 08:53:36 GMT

Hi,

Attached is the average from sar -d 600 10. On my previous thread it was told that avserv < 6ms is good. IS there a potential issue due to I/O bottlenecks for the system performance.

Thanks

Re: Disk I/O Utlisation

John Jayaseelan — Fri, 05 Dec 2003 08:54:01 GMT

Attached

Re: Disk I/O Utlisation

Elena Leontieva — Fri, 05 Dec 2003 09:07:37 GMT

If the %busy is greater than 50 percent for a disk device, there could be a disk bottleneck. If avwait is greater than avserv it is also indication of having a disk bottleneck. I've heard that avsrv < 10 ms is OK.

Elena.

Re: Disk I/O Utlisation

G. Vrijhoeven — Fri, 05 Dec 2003 09:09:24 GMT

Hi,

The average number of r/w is low and you serv time is relative high but i do not think you can say it is the bottleneck just by looking at this output.
Check sar -b for buffercheck hitrate, vmstat for memory usage, swapinfo -tam, sar -uM for user/system/wio/idle time. You can install a tool like glance ( free 60 days) to look into processes.

Hope this helps,

Gideon