Can you give me any insight into making more use of the swap; see below?
We have had systems significantly speed up after adding memory, even
though swap was not being used. I realize that swap / disk is going to
be slower, but with cache and buffers shouldn't it be at least close?
lnx057:~ # free -l
total used free shared buffers
cached
Mem: 763208 758572 4636 0 77092
592676
Low: 763208 758572 4636
High: 0 0 0
-/+ buffers/cache: 88804 674404
Swap: 1079896 300 1079596
Thank you for any help.
David Dean
Information Systems
*bcbstauthorized*
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Barton Robinson
Sent: Monday, September 29, 2008 1:23 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Performance question
Best practices is to use Vdisk for swap, and reduce linux virtual
machine sizes - not to
buy more REAL z/VM memory unless you really need it. "101% memory
useage" means almost
nothing. It is not relevant to performance or capacity, and thus
shouldn't have business
decisions or performance decisions decided based on that number.
Dean, David (I/S) wrote:
> My SLES 10.1 zLinux servers have been notorious for not making much
use
> of the swap space, even when we lower the main (virtualized) in the
USER
> DIRECTORY. We may have something just not configured optimally
> somewhere, but our luck has gone with adding main Linux memory and
> subsequently having to add ZVM memory.
>
>
>
> David Dean
>
> Information Systems
>
> *bcbstauthorized*
>
>
>
>
>
>
>
> ________________________________
>
> From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED]
On
> Behalf Of Mary Anne Matyaz
> Sent: Monday, September 29, 2008 11:31 AM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Performance question
>
>
>
> If your VM system is at 101% memory usage, and you are overcommitted
by
> about 14%, is it worthwhile to add
> a vdisk to a linux for swap space, or better just to add main memory
to
> the linux?
>
> MA (Looking for opinions, thoughts, rationalizations, whatever. :)
>
> Please see the following link for the BlueCross BlueShield of
Tennessee E-mail disclaimer: http://www.bcbst.com/email_disclaimer.shtm
>
Please see the following link for the BlueCross BlueShield of Tennessee E-mail
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