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-Original Message-
From: David Boyes [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 26, 2006 11:19 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: 3390 Mod 3 verses 3390 Mo
> Presently the application is split onto several disks. The data is to
be
> combined onto one disk. The data is a NOMAD database.
Ah. That would argue against SFS, then. Nomad does its own balancing act
internally.
> I thought PAV was not an option for VM. Does z/VM 5.2 support PAV?
Well, s
Thank you.
Cecelia Dusha
VM supports PAV for guests. I don't think it does, or needs to, support
it natively.
PAV is a chargable feature on the DS6800. I elected not to buy it on
our DS6800.
Tom Duerbusch
THD Consulting
>>> [EMAIL PROTECTED] 4/25/2006 12:17 PM >>>
Presently the application is split onto several disk
You should probably look at the number of i/o's you are doing today
across the 3 and add them up and see if that number is reasonable on
your modern DASD. It's likely you'll see no problem at all,
especially if most r/o where MDC will kick in for you. If you've got
only 1 virtual machine doing
.
Thank you.
Cecelia Dusha
-Original Message-
From: Schuh, Richard [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 25, 2006 12:48 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: 3390 Mod 3 verses 3390 Mod 9s
Tom and Co.,
I see no statement that there is any intent to combine the 3 existing
On Tue, 25 Apr 2006 13:27:31 -0400, David Boyes wrote:
>> We currently have 3390 mod 3 defined volumes. The customer requires a
>> larger mini disk size than what will fit on a 3390 mod 3. We are
>planning
>> to create 3390 mod 9s for their larger mini disks.
>
>If it's a CMS user, use SFS. Tha
> We currently have 3390 mod 3 defined volumes. The customer requires a
> larger mini disk size than what will fit on a 3390 mod 3. We are
planning
> to create 3390 mod 9s for their larger mini disks.
If it's a CMS user, use SFS. That's exactly what it's for, and all those
restrictions are pret
On Tue, 25 Apr 2006 11:55:39 -0500, Stephen Frazier wrote:
>VM only allows one I/O per disk at a time. If this is a CMS mini disk then
>there
>will be no impact as CMS mini disks are not normally shared for write by
>multiple users. Disk cache will probably hide an effect on read sharing. If it
VM only allows one I/O per disk at a time. If this is a CMS mini disk then there
will be no impact as CMS mini disks are not normally shared for write by
multiple users. Disk cache will probably hide an effect on read sharing. If it
is a Linux disk then there is no impact because Linux doesn't l
Cecelia,
Since I know your environment (z/VM with NOMAD databases on a DS6800), I
wouldn't expect any measurable performance hit from using mod 9s.
With raid technology, the concern should be directed more at balancing th
e
I/O rate across LCU's rather than at the device level within an LCU.
Tom Duerbusch
Sent: Tuesday, April 25, 2006 9:32 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject:Re: 3390 Mod 3 verses 3390 Mod 9s
If you were near the performance limits of your current (3) 3390-3
volumes, then you don't want to combine them to a 3390-9.
To really know, you need to kno
If you were near the performance limits of your current (3) 3390-3
volumes, then you don't want to combine them to a 3390-9.
To really know, you need to know the I/O rates on the 3 volumes.
Also, you need to know what dasd you are actually using. Modern dasd
(raid that is), with sufficient cac
3 verses 3390 Mod 9s
> -Original Message-
> From: The IBM z/VM Operating System
> [mailto:[EMAIL PROTECTED] On Behalf Of Dusha, Cecelia
> Ms. WHS/ITMD
> Sent: Tuesday, April 25, 2006 8:03 AM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: 3390 Mod 3 verses 3390 Mod 9s
>
This is a case for using the Shared File System.
___
Jim Hughes
603-271-5586
"Impossible is just an opinion."
=>-Original Message-
=>From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED]
On
=>Behalf Of Dusha, Cecelia Ms. WHS/ITMD
=>Sent: Tuesday, April 25, 20
> -Original Message-
> From: The IBM z/VM Operating System
> [mailto:[EMAIL PROTECTED] On Behalf Of Dusha, Cecelia
> Ms. WHS/ITMD
> Sent: Tuesday, April 25, 2006 8:03 AM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: 3390 Mod 3 verses 3390 Mod 9s
>
> I have a question that pertains to performan
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