In our case, we're talking about going from 76 GB to 140 GB. We're trying to
stay ahead of requirements, so suggestions such as "look at your performance
monitor" don't really work. The workload that will use the additional capacity
hasn't arrived, yet. I need to submit my disk requirements for paging to our
Storage team, because it takes them a month or two to add the disk. I can't
afford to wait until performance gets bad.
Right now, this system has about 30 Linux guests, all running WAS. Most of
them have 6 GB of virtual storage. This is a development system, so it's
actually larger than our production systems. Developers like to have several
levels of testing (UAT, SIT, etc) for each production server. One of the
drivers for the upgrade is a proposal to add a 28 GB Linux guest to
development, and one to each of two production systems. The wisdom of having a
single guest that large remains to be seen, as does the actual requirement for
that much storage. I know about SET REORDER and all that. If they really do
need that much storage, they might end up with multiple smaller guests.
Dennis
"Decision" is not a verb.
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf
Of Gary M. Dennis
Sent: Thursday, September 30, 2010 08:07
To: [email protected]
Subject: Re: [IBMVM] Mixed page volume sizes
Soooooooo if you had guests averaging 18GB each, and you follow
recommendations for page volume utilization (50% as I understand it), Mod 9s
would yield around 4GB useable page space each.
That would give you 100 such images per VM ...... (250 volumes times the
4GB/volume divided by 18GB per image)?
I know this rough but am I headed in the right direction? I'm making the
assumption (an this may be incorrect) that the available real storage
backing could support virtual requirements.
On 9/30/10 9:24 AM, "Rob van der Heij" <[email protected]> wrote:
> On Thu, Sep 30, 2010 at 3:39 PM, George Henke/NYLIC
> <[email protected]> wrote:
>>
>> Sorry for my ignorance and naivete, but I am simply staggered at the volume
>> of page volumes of whatever size, 100 - 240.
>>
>> I have just a Dev Test z/VM environment with 2 measly 3390-3's for Paging.
>>
>> Granted, I am running only 5 z/OS vm's and 3 Linux vm's.
>
> My test system does not have that either. But think of 250G real
> memory and some 100 Linux guests of 4-10 GB each, all running
> enterprise applications.
>
> | Rob
>
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
1121 Edenton Street
Birmingham, Alabama 35242-9257
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