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тАО08-04-2008 11:37 AM
тАО08-04-2008 11:37 AM
please advice
Solved! Go to Solution.
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тАО08-04-2008 11:41 AM
тАО08-04-2008 11:41 AM
SolutionPost some swapinfo -tam
Also, if you need to increase secondary swap space it does NOT have to be in vg00. It can be in any vg and on any disk.
page in = a process started
page out = could be that a process has ended
deactivations = a process was deactivated and sent to device swap.
Glance is a great tool for monitoring this.
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тАО08-04-2008 12:00 PM
тАО08-04-2008 12:00 PM
Re: page in
The 'pi' number really doesn't matter. That is just indicative of processes starting.
The 'po' number is what you want to keep an eye on. If the 'po' column in vmstat is greater than 10, then you have reason to worry and should add more RAM.
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тАО08-04-2008 12:12 PM
тАО08-04-2008 12:12 PM
Re: page in
Actual paging I/O (or swapping in the old terminology) is never desirable. Page-out activity can be seen in the 'po' column of 'vmstat'. This column reflects of memory pressure. Page-out values in dougle-digits indicate serious performanace degradation.
Swap space is also used for process reservatation too, and that's both normal and acceptable. Every process started must reserve swap space should it ever be paged-out. Hence, you may indeed see swap utilization (with 'swapinfo' without any actual I/O.
Whether or not your device swap space resides on vg00 as primary swap space; or on vg00 as both primary and secondary swap space in two or more logical volumes; or as multiple secondary swap spaces on multiple volume groups; is immaterial. It is common to have a relatively small primary swap space (say half of your physical memory) which, by definition, resides on your boot disk, and then have one or more equal or larger secondary device swap pools.
Regards!
...JRF...
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тАО08-04-2008 12:14 PM
тАО08-04-2008 12:14 PM
Re: page in
Actual paging needs to be fixed either be increasing the supply of memory or reducing the demand. Buffer pool can be reduced. Oracle SGA can be reduced but in general, I find adding memory is better for all concerned.
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тАО08-04-2008 07:57 PM
тАО08-04-2008 07:57 PM