First, I would not give 8 virtual CPUs for each z/OS guest but rather start
with 2 VCPUs and see if the workload demands more. If z/VM only has 8
physical CPUs, you seem to have created a 8:1 virtual/real CPU ratio which
could cause significant overhead and possible thrashing.
Does z/VM 5.3 have expanded storage allocated as a fast paging device
probably allocate 2GB for ES.
Is that DASD shared among all z/OS guests? If so, could you show a small
sample of how some disks are defined across the guests?
Jon Nolting - System z IT Architect (zITA)
zChampion
IBM US West IMT based near Seattle
(206) 587-2244 (Work) - T/L 277-244
(425) 281-5750 (Cell)
(206) 587-2244 (Fax)
(425) 222-7969 (Home)
From: Alain Benveniste <a.benveni...@free.fr>
To: IBMVM@LISTSERV.UARK.EDU
Date: 06/17/2010 11:08 AM
Subject: Re: Multiple z/OS under z/VM =xSYSTEM
Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>
Marcy
The sizes of those zOS under z/VM are exactly the sizes they have in lpar
at home...
Alain
Le 17 juin 2010 à 19:23, Marcy Cortes a écrit :
> What's the memory size of each of those 8 virtual machines?
>
>
> Marcy
>
>
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> -----Original Message-----
> From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Alain Benveniste
> Sent: Thursday, June 17, 2010 9:54 AM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: [IBMVM] Multiple z/OS under z/VM =xSYSTEM
>
> Back from a DR test, the feedback I have from users is that a simple
'ent=
> er'
> on z/OS generate a xSYSTEM, short for me, but really embarassing for the
> users...
> We run a zVM530 with 8 zOS in 1.8 as guest, 20G real storage, 4000mips.
A=
> ll
> the DASD are defined as MDISK with MW. I gave access to the 8 processors
=
> for
> the zOS. MDC is on. No real activity on those partitions. What am I
suppo=
> sed
> to look at ? I took a look at the DIRMAINT options... Nothing flashing !
=
>
> Do I have to consider this behavior as 'normal' ? IS at to see with the
> reserve/release on DASD, MDISK translation...
>
> Any suggestions ?
>
> Alain Benveniste
