I have 8Gb memory in my JS21 server. When I run svmon it shows 3655Mb memory is utilized and 4344Mb free. I have configured 8Gb paging space and 14% is utilized which is 1Gb. I dont have memory issues but just want to know Why 1gb paging is utilized when my almost 4Gb real memory is free? Can anyone give some input...
Hi,
several possible reasons - is this AIX 5.3 ? If so - what are the values of minperm, maxperm and lru_file_repage ? Is your box running DBs or webapplications ?
Is it still true that AIX will always page out? Even when there is no memory shortage? I recall from AIX 4 days that AIX would always page out "less import" memory pages even if the system had enough free memory.
@petervg:
No, it should only page out when there is RAM shortage these days. There is an early and late/deferred Paging Space allocation mode, that you can export with some env variable to control OS/applications behaviour in terms of Paging Space usage.
@vjm:
As zxmaus said, several reasons. It might be also interessting to have 24/7 monitoring of Paging Space up and running, like a
It could be, that the box is not paging at all on day time when you can have a glimpse on it, but at night while running backups or batch jobs etc., it might occure.
When this line above runs for some days, you could check (choose a filesystem for the log that has enough space and isn't critical!) it, if there is any Paging Space Ins or Outs occuring with:
which would produce the following (example) output:
Last edited by zaxxon; 04-04-2011 at 08:24 AM..
Reason: marked the page ins and outs bold and underlined
Hi,
I have paging size 2048M showed from topas and 10240M showed from "lsps -a", can anyone tell what is the difference? and how to change the PAGING SIZE (showed in topas) to 8192M?
Can you please tell in detail step?
Thanks!
Victor
#topas
Topas Monitor for host: egsprc01dev ... (10 Replies)
Hello dear friends, We have VG filevg which consists of 2 PVs when I rechecked the VG there is no Pagingspace LV.. The VG is usually Highly loaded because much reads and writes.. Is this a must to create Paging space on the specified LV? (2 Replies)
Hi Friends,
Can you please answer the following questions.
1) What is Paging rate ?
2) How to Calculate Paging rate from the following topas command output?
Faults 206 Real,MB 28671
Steals 311 % Comp 71.1
PgspIn 1 % Noncomp 28.8 ... (3 Replies)
Hi,
What is the command to know paging in RedHat? vmstat talks about swapping but not paging.
Also how much paging should be tolerated in the system and how to reduce paging.
Thanks in advance. (1 Reply)
Hello everyone
I have a doubt about how many paging space can have in the same disk.
lsps -a
Page Space Physical Volume Volume Group Size %Used Active Auto Type
paging00 hdisk0 rootvg 3072MB 1 yes yes lv
hd6 hdisk0 ... (4 Replies)
Hello everyone
I have 4g of paging space in my rootvg disk
I´m going to reduce them to 1gb in my rootvg disk and add 3gb of paging space on my san disk.
My rootvg disk is mirror.
My question is I can do this on line ?
and I can do with the mirror ? or I need to unmirror first my... (2 Replies)
Hi Guys: Would like to know how to check system swapping and paging and some theory on how they function. I am an oracle dba and my environment is 8171 on AIX 433. We have a 1GB of RAM on the box and I am educating myself to see how much more SGA can be accommodated on the box and what are the... (2 Replies)