I have some questions regarding the performance, MEMORY/ Virtual Memory (paging /swap space)
Please see the nmon-MEMORY stats from my AIX LPAR.
Code:
24 GB --> RAM
3456 MB --> Paging Space
Code:
│ Memory ───────────────────────────────────────────────────────────────────────
│ Physical PageSpace | pages/sec In Out | FileSystemCache
│% Used 97.5% 0.8% | to Paging Space 0.0 0.0 | (numperm) 64.1%
│% Free 2.5% 99.2% | to File System 0.0 24.0 | Process 23.8%
│MB Used 23973.7MB 26.9MB | Page Scans 0.0 | System 9.7%
│MB Free 602.3MB 3429.1MB | Page Cycles 0.0 | Free 2.5%
│Total(MB) 24576.0MB 3456.0MB | Page Steals 0.0 | ------
│ | Page Faults 0.0 | Total 100.0%
│------------------------------------------------------------ | numclient 64.1%
│Min/Maxperm 705MB( 3%) 21160MB( 90%) <--% of RAM | maxclient 90.0%
│Min/Maxfree 960 1088 Total Virtual 27.4GB | User 83.7%
│Min/Maxpgahead 2 8 Accessed Virtual 8.0GB 29.3%| Pinned 14.1%
│ | lruable pages 6018720.0
│──────────────────────────────────────────────────────────────────────────────────────
Question 1)
I see that MEMORY is utilized around 98% all the time. and no paging activity. Is this normal? do i need to react ?
Note: this LPAR has very lite application, system is idle most of the time. But still RAM --> 98% used
Question 2)
Code:
USED
----
RAM --> 98%
paging space --> 1%
file system caching --> 64%
process (user/app)--> 24%
system --> 9.7%
FREE
----
free --> 2.5%
As per my understanding,
LPAR will consume entire MEMORY, even if we allocate 50 GB RAM (in my case) to this LPAR. I believe...mostly for filesystem caching. And system will release memory from filesystem caching when ever there is a need for process.
is this correct ? please correct me if i'm wrong
question 3) what is the RAM to Paging space ratio on prod systems ??
Code:
In my case, RAM --> 24 GB
Paging Space --> 3456 MB
I think i read some where....that Paging space should be atleast 3/4 of RAM. Please advice.
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08-13-2013
