Originally posted by: Spring2011

Hello everyone, I am unable to understand why the numperm percentage is so low even though the number of free pages is high. I do see that after a while, the numperm value does go up to 50-60%. Can you please explain.

#vmstat -v
7340032 memory pages
7011862 lruable pages
4653391 free pages
5 memory pools
1676341 pinned pages
80.0 maxpin percentage
20.0 minperm percentage
80.0 maxperm percentage
2.1 numperm percentage
149284 file pages
0.0 compressed percentage
0 compressed pages
1.9 numclient percentage
80.0 maxclient percentage
133517 client pages
0 remote pageouts scheduled
467676 pending disk I/Os blocked with no pbuf
2828055 paging space I/Os blocked with no psbuf
75234 filesystem I/Os blocked with no fsbuf
0 client filesystem I/Os blocked with no fsbuf
1131917 external pager filesystem I/Os blocked with no fsbuf
0 Virtualized Partition Memory Page Faults
0.0 Time resolving virtualized partition memory page faults
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Originally posted by: ostost

It's not unusual to have free pages and low numperm value after start a system. That means the cache is still almost empty. The numperm value starts to go up when you have I/O activity on the system and file pages are kept in the cache.
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Originally posted by: Spring2011

Hi ostost:
The server has been up for more than 11 days. Numperm stays high 60-70% but suddenly falls to 1-2% even while there are free pages available. Any thoughts?
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