topic swap space utilization is high. in Operating System - HP-UX

swap space utilization is high.

vikramjeet — Sun, 14 Feb 2010 11:54:16 GMT

Hello experts

I want to know reason why swap utilization is so high? could you please more clear on output of swapinfo command?
what is reserve?
please see the attachemet and suggest how can i reduce swap utilization.

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 12:03:21 GMT

>>>>I want to know reason why swap utilization is so high?<<<

To see what is using all your swap / virtual memory:

Check with below command

$ UNIX95= ps -efo vsz,ruser,pid,ppid,args | sort -rn | more

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 12:07:03 GMT

>>>could you please more clear on output of swapinfo command?<<

man swapinfo

reserve = Paging space on reserve. This is the amount of paging space that could be needed by processes.

>>please see the attachemet and suggest how can i reduce swap utilization<<

I would suggest , to check which process eating all you swap ,

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 12:11:24 GMT

looks "like you application process" eating all your "swap" >>468328 twsprd82 14886<<

I suggest you "escalte to your Application/Database team"

sometime it could also application problem causing issue.

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 12:42:13 GMT

* I would consider "server may be busy" do to the heavy work load

* also Check for any "Disk bottle" & shared memory load?

# ipcs -mob
-- What is the shared memory load?

# sar -d 5 50
-- What is the disk I/O load?

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 12:45:48 GMT

if satisfied with answers.

How to assign points check the below link

http://forums13.itrc.hp.com/service/forums/helptips.do?admit=109447627+1256027208667+28353475#33

Re: swap space utilization is high.

vikramjeet — Sun, 14 Feb 2010 13:01:28 GMT

Hello Johnson,

I attached the sar and ipcs output.

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 14:52:11 GMT

# ipcs -mob
IPC status from /dev/kmem as of Sun Feb 14 04:56:04 2010
T ID KEY MODE OWNER GROUP NATTCH SEGSZ

Shared Memory:

m 3375157 0x18d65c78 --rw-r----- oracle dba 286 16022274048
m 54 0x5d20b0ac --rw-r----- oracle dba 38 49341890560
m 294967 0x85fc3a38 --rw-r----- oracle dba 263 127423201280
m 98360 0x929b2b8c --rw-r----- oracle dba 141 11525971968

Looks like you have 4 (oracle) DB instances on the server you got "ipcs -mod"

How much RAM do you have on this particular server and how much SWAP?

swapinfo -mat

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 15:06:43 GMT

Is server "Kernal parameter's has been set according to Oracle recommdations /standard ?

It may be also well be your RAM is not sufficient for the Oracle load running ?

can you also check VM starvation by paying attention for "sr"

vmstat 5

sr = pages scanned by clock algorithm

Re: swap space utilization is high.

Johnson Punniyalingam — Sun, 14 Feb 2010 15:10:13 GMT

For more information,
Check the below thread.

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=99729

Re: swap space utilization is high.

samay_hcl — Mon, 15 Feb 2010 02:30:47 GMT

Thanks Johnson for support.

Re: swap space utilization is high.

Emil Velez — Mon, 15 Feb 2010 04:57:51 GMT

You are not using your swap space.

Notice the 0% next to your device swap.

Ignore the line with memory since that is pseudo swap.

memory utilization is high.

Look you have 256 GB of physical memory and 30 GB of swap. The pseudo swap that allows you to use all of your memory means that you are using all of your memory. Good capacity planning.

Your cpu utilization is 40% and your free memory is 10GB. Looks like your system has enough memory for the application. You might have some disks that are being hit more than others but otherwise you look like in good shape.

Question is

Re: swap space utilization is high.

Dennis Handly — Mon, 15 Feb 2010 06:48:21 GMT

>what is reserve?

Allocated device swap but not used.

So what's wrong? You may not be able to start very many new processes if you want to increase the load on the system.