High Swap Space - AIX 5.3 DB2 6.40

[Former Member]

Hi All,

We are having major swap space issues on some of our Servers. We have applied Kernel DB6-640-64-AIX5-UCP-0175.

For example one of our systems has 8Gb memory and 20Gb swap space with one SAP instance. It was running okay for a while but now it reaches 20gb very quickly and jumps within 5mins from 1% to 80% usage. Of course after it hits 95% AIX starts killing processes. When we look at what is using the swap space it is all the disp+work processes.

We have increase the paging space to 40gb but now it is using 23gb.

We had a smilar problem another to systems.

How much swap space is normal? Is there something we can change to reduce this.?

We only have 15 DIA, 3 BGD, 3 BGD, 2 SPO.

Thanks for help from anyone.

Derek

[former_member618758]

Hi,

You might want to check notes bellow for possible resolution of the problem :

921196 AIX Memory Tuning Recommendations >5.2

78498 High paging rate on AIX servers, in part. Database servers

902952 AIX: Paging even though sufficient free memory

912425 AIX: Unexplained high memory consumption

856848 AIX Extended Memory Disclaiming

Hope this helps,

George