Tuesday, December 17, 2013

Avoid AIX 5 To Swap and Also Avoid FS Cache System To Hold Memory

www.unixbabuforum.inWe have a TSM server running AIX 5 like OS. 
We constate that the system FS cache is "using or holding" about 75 % of the total amount of memory 

Our objectives are : 

1_) Avoid AIX to SWAP as much as possible. 
2_) Reduce the use or the hold of memory by the system FS Cache, which now is using about 75 % of the total memory. 
3_) Allow 512 MO more memory to TSM only and for TSM only, because each time we add memory, the FS CACHE system again hold it, how can I avoid this and 
also avoid the SWAP as much as possible. 

Below the output of the topas command : 

+-topas_nmon--= KB<-->MB---------Host=ptsm0ev--------Refresh=2 secs---09:39.43------& 
x2500;-----------+ 
¦ Memory --------&x250 
0;-------¦ 
¦ Physical PageSpace | pages/sec In Out | FileSystemCache ¦ 
¦% Used 99.8% 0.1% | to Paging Space 0.0 0.0 | (numperm) 76.1% ¦ 
¦% Free 0.2% 99.9% | to File System 2836.0 1396.5 |.Process 13.5% ¦ 
¦MB Used 11691.8MB 11.8MB | Page Scans 2935.5 | System 10.2% ¦ 
¦MB Free 20.2MB 8180.2MB | Page Cycles 0.0 | Free 0.2% ¦ 
¦Total(MB) 11712.0MB 8192.0MB | Page Steals 1982.0 | ------ ¦ 
¦ | Page Faults 717.5 | Total 100.0% ¦ 
¦------------- | numclient 63.3% ¦ 
¦Min/Maxperm 2247MB( 19%) 8988MB( 77%) <--% of RAM | maxclient 76.7% ¦ 
¦Min/Maxfree 960 1088 Total Virtual 19.4GB | User 85.9% ¦ 
¦Min/Maxpgahead 2 8 Accessed Virtual 2.6GB 13.3%| Pinned 9.9% 

www.unixbabuforum.inCheck vmo parameter. 
I set next. This value defaukt(Near) in aix 6.1. 

/usr/sbin/vmo? -o maxperm%=80 
/usr/sbin/vmo? -o maxclient%=80 
/usr/sbin/vmo? -o minperm%=5 
/usr/sbin/vmo? -o strict_maxclient=1 
/usr/sbin/vmo? -o lru_file_repage=0 

A paging algorithm changes by?strict_maxclient=1 & lru_file_repage=0 

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