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disks in rootvg is 100% busy. users can not login GUI. Help!

I have a system problem. Today, in about 20 minutes, users can not logon to the system from their GUI. I can see some information in AIX .

the system rootvg:hdisk0,hdisk1 is 100%busy.

there are many swap, pagein pageout viewing from vmstat .

another information is : In our system, the memory usage is always 90%,and the swap usage is always 25% . If I restart the system, the swap usage will be below 10%, after several weeks, it becomes 25% again.

why hdisk0,hdisk1 is busy, there are no sap data in rootvg.

if it is because we have not restart our system for a long time ?

thanks

replied

Hello,

If you total shared memory requirements of your SAP system Oracle SGA + Extended Memory + SAP Buffers + Other OS programs is higher than your total physical memory. Hence the paging will always happen. If you wish to reduce paging use any of the 2 options;

1. Reduce the shared memory allocation for SAP and Oracle ( SGA, program buffers etc..)

2. Add more physical memory to the box.

Regards,

Manoj

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