It appears there's alot of cache usage. What's running on this machine?
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Dean, David (I/S) wrote:
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. :)
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