topic Re: Swap Space utilization. in Operating System - HP-UX

Swap Space utilization.

AnthonySN — Mon, 13 Oct 2008 13:42:55 GMT

Hello,

We hava an rx2600 server having 8GB ram and swapspace of 8 GB, We have oracle 10g installed on hpux.11.31. there are 5 instances running on it. Problem is that the swapspace utilization is showing as 97% used.
Is the swapspace insufficient or what parameters do we need to tune in Oracle or Hpux.
os is HPUX.11.31.

Re: Swap Space utilization.

Court Campbell — Mon, 13 Oct 2008 13:47:24 GMT

How large are your sga's? And are you actually paging out? Try vmstat -S 5 25 and look at so and po.

Re: Swap Space utilization.

Fabio Ettore — Mon, 13 Oct 2008 13:56:41 GMT

Hi,

please post also

swapinfo -tam

Regards,
Fabio

Re: Swap Space utilization.

AnthonySN — Tue, 14 Oct 2008 10:47:06 GMT

Attached is the output of vmstat -S 5 25

and below is the output of swapinfo â tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 3655 4537 45% 0 - 1 /dev/vg00/lvol2
reserve - 4062 -4062
memory 7773 5448 2325 70%
total 15965 13165 2800 82% - 0 -

Re: Swap Space utilization.

SKR_1 — Wed, 15 Oct 2008 05:36:21 GMT

Here your swap is 47% in use and physical memory is 70%. And overall utilization is 82%.

Its better if we keep swap double to the physical memory.

Thanks

SKR

Re: Swap Space utilization.

Fabio Ettore — Wed, 15 Oct 2008 10:04:08 GMT

SKR,

the line memory in swapinfo is not for physical memory. This is a typical misunderstanding. It's for pseudo-swap.

Anyway it sounds to me just like a system overloaded and probably you would consider to balance the load differently (for example stopping one instance of five instances on this system and having it on another system) or adding physical memory.

HTH.

Best regards,
Fabio

Re: Swap Space utilization.

John Guster — Wed, 15 Oct 2008 15:35:25 GMT

check with ipcs -mobp to see if there is any unreleased/locked memory.