Look at your disk swap utilization (not allocation) for those servers
and use that much for vdisk. Of course you may want to add some for any
storage need spikes.
Levy, Alan wrote:
Many of the 30 servers run intense java applications. Some of them are
at 2G logon memory and they still swap.
What would you recommend as swap space for these users ?
Alan Levy
VM/Linux Administrator
W: 718-403-8020
C: 347-401-4629
-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Mark Post
Sent: Tuesday, February 27, 2007 8:30 PM
To: [email protected]
Subject: Re: Vdisk
>>> On Tue, Feb 27, 2007 at 9:47 AM, in message
<[EMAIL PROTECTED]>,
"Levy,
Alan" <[EMAIL PROTECTED]> wrote:
-snip-
I have about 30 linux servers, each with about 1G swap on physical
dasd.
Can I use Vdisk for each of them ?
Others have answered the questions you asked. I'm going to ask
questions of my own...
Why do you have 1GB of swap defined for each guest? That sounds far too
high for most uses. Are you following the rule of thumb to use "twice
the amount of physical RAM?" If so, you shouldn't be doing that. It's
not even valid in the midrange world any more, although a lot of people
supporting those kinds of systems haven't gotten the memo yet. In the
last major Intel deployment I was involved with, the consultants from
the third-party intermediary insisted that we do that for systems with
8GB, 16GB, etc., even though the amount of swap space actually being
used on the systems was *zero*. "This is what Oracle recommends, so we
want you to do that." I fought it, but the account manager caved,
finally.
Squeeze your guests down as much as possible, and see how much swap
really gets used. (Remember, VDISK can support a _lot_ of paging I/O
with no performance impact.) Reduce your swap sizes to cover that, plus
as much "insurance" as you think you might need.
Mark Post
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