07
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: [IBMVM] Mixed page volume sizes
S 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 imag
S 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
"Toto, I've a feeling we're not in Kansas any more"
Rob van der Heij
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09/30/2010 10:24 AM
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Re: Mixed page volume sizes
On Thu, Sep 30, 201
On Thu, Sep 30, 2010 at 3:39 PM, George Henke/NYLIC
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
ave to run that needs 240 page volumes?
I am sure it is justified,
I would just like to know more about the workload.
Mark Wheeler
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09/30/2010 09:00 AM
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Re: Mixed pa
en?"
Tom Peters, author of "The Little BIG Things"
> Date: Wed, 29 Sep 2010 15:53:25 -0700
> From: dennis.l.o'br...@bankofamerica.com
> Subject: Mixed page volume sizes
> To: IBMVM@LISTSERV.UARK.EDU
>
> On of our z/VM 5.4.0 systems is about to grow to 140 GB
On Thu, Sep 30, 2010 at 1:35 PM, Martin Zimelis
wrote:
> And record one more vote that mixed sizes is a very bad idea (for
> the reasons Rob described).
But "your very bad may vary" ;-) For anyone still awake, ponder on this one...
"Rob, we just put in 30 volumes 3390-9 for paging. After th
Dennis,
I would add one more thing to what Rob said. Your paging rate
should also be taken into account. If 100 "spindles" will handle your
peak paging rates without causing measurable page wait, I'd vote for
going the all-3390-9 route rather than the -3 approach.
And record one more vote
On Thu, Sep 30, 2010 at 12:53 AM, O'Brien, Dennis L
wrote:
[ snip ]
need them, so if I add another 32 GB of storage, my choice would be
something like 212 3390-3's and 28 3390-9's, or 100 3390-9's. Which
would be a better choice?
As you indicated, z/VM spreads paging effectively to fill volumes
CP will page out to the disk with the best performance, so yes, the mdl3's
may be filled too much when mixing sizes.
2010/9/30 O'Brien, Dennis L
>
> On of our z/VM 5.4.0 systems is about to grow to 140 GB of storage. Given
> our target overcommit ratio of 3:1, and IBM's advice to keep paging sp
On of our z/VM 5.4.0 systems is about to grow to 140 GB of storage. Given our
target overcommit ratio of 3:1, and IBM's advice to keep paging space no more
than 50% full, this should just about fit onto 240 or 248 3390-3 sized volumes.
My question is what will happen the next time we add stora
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