it.
From: The IBM z/VM Operating System on behalf of Bill Holder
Sent: Fri 10/3/2008 6:04 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Paging volumes, size vs. number
Having a good paging system is as much about bandwidth as it is about
capacity, so I'd say the other
: The IBM z/VM Operating System on behalf of Bill Holder
Sent: Fri 10/3/2008 6:04 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Paging volumes, size vs. number
Having a good paging system is as much about bandwidth as it is about
capacity, so I'd say the other responders are offering sound advice. Lac
z/VM Operating System on behalf of Bill Holder
Sent: Fri 10/3/2008 6:04 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Paging volumes, size vs. number
Having a good paging system is as much about bandwidth as it is about
capacity, so I'd say the other responders are offering sound advice. Lac
We are sizing a new z/VM system for a Linux guest workload. We
traditionally use 3390-3 size devices for paging. We determined that we
need 16 3390-3's for this particular workload. Our DASD people asked if
we could use 3390-9's instead. Based on space, they want to give us 6
3390-9's for
How many packs you need depends on the IO rate that is required to be
handled by the paging subsystem. That is more important than the
volume you seem to know.
A pack can sustain a certain IO rate with a good responsetime. For
paging packs one usually recommends mdl 3 and not mdl 9, CP will not
Operating System [mailto:[EMAIL PROTECTED] On Behalf Of
O'Brien, Dennis L
Sent: Friday, October 03, 2008 11:11 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Paging volumes, size vs. number
We are sizing a new z/VM system for a Linux guest workload. We traditionally
use 3390-3 size devices for paging. We
I don't remember if these numbers are available from Performance Tool
Kit. I think so. If you can look at numbers for a present workload and
if it's different or you expect to see differences, you should just be
able to factor. What I'm getting at is that you should be able to look
at
: [IBMVM] Paging volumes, size vs. number
If I could, I would stay with the 16 3390-3's. My reason is that the
IO load is spread over more volumes. Also, if I could, I would spread
the volumes over multiple CUs. That's how I look at.
Paul Feller
AIT Mainframe Technical Support
-Original
Having a good paging system is as much about bandwidth as it is about
capacity, so I'd say the other responders are offering sound advice. Lac
k
of sufficient capacity will certainly hurt badly when you fill it up and
run
out (causing a PGT004 abend), but lack of sufficient bandwidth will hurt
