Disappearing free pages in memory

From: Siebert, Aaron (aaron.siebert@nagrastar.com)
Date: Mon Apr 26 2004 - 19:21:40 EDT

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Es40 4.0G 16 GB memory 4 cpu

We are fighting a disappearing free memory issue with a large oracle
server. Upon boot and mount of the db we have 1M free pages. This
decreases rapidly over time. Until it reaches the thresholds set by the
vm subsystem attributes for minimum free pages.

Oracle SGA is set to 6 GB. This leaves 10 GB physical memory free. We
have reduced the ubc values below:
vm:
        vm-maxvas = 7516192768
        vm-mapentries = 400
        ubc-minpercent = 1
        ubc-maxpercent = 5
        ubc-borrowpercent = 3
        vm-vpagemax = 917504
        vm-aggressive-swap = 1

Here are the advfs settings, I am curious about the CacheMax and
AccessMax values:

advfs:
AdvfsCacheMaxPercent = 7
AdvfsAccessMaxPercent = 80

1. Are these 2 values in relation to UBC, total system memory?
2. Is the AdvfsAccessMaxPercent value in relation to
AdvfsCacheMaxPercent?
3. Kernel is allocating by ps -ef -o vsize more than 4.5GB
4. Does anyone have any other information that might help us to
determine why our system over time continues to lose free pages?

Thanks for everyones help

Aaron Siebert
Nagrastar Customer Support Engineer
303-706-5492 fax 303-706-5719
Aaron.Siebert@NagraStar.com

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