Steve,
As long as you understand that you are playing with fire... If that lower address fails to respond within whatever time-out CP uses, or it's broken, then you could end up using the higher address without knowing it. You might want to ask yourself what the damage would be if you did end up using the higher address, and if having duplicate volsers is worth the recovery or data loss.
If you're just doing this for tests or conversion it's a lot different than expecting to always use duplicate volsers in a regular production environment.
At the very least you may want to write an EXEC to run at each IPL, checking to ensure that none of the higher addresses are being used - reporting any use of the higher address and taking appropriate action. Perhaps finding higher-addressed volumes online you could varying them offline, or issue an automated CP SHUTDOWN REIPL (possible IPL loop here) to see if the next IPL would get the lower volumes as expected. Almost everything we do is a business-based judgement call.
Mike Walter
Hewitt Associates
The opinions expressed herein are mine alone, not my employer's.
| "Steve Gentry"
<[EMAIL PROTECTED]>
Sent by: "The IBM z/VM Operating System" <IBMVM@LISTSERV.UARK.EDU> 06/29/2006 05:38 PM
|
|
And to re-enforce what has already been said. We IPL'd a few minutes ago the volume
with the lower address was used and the one with the higher address was not
attached to anything.
Thanks all . . . .
Steve
| Rich Greenberg <[EMAIL PROTECTED]>
Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU> 06/29/2006 04:24 PM
| To: IBMVM@LISTSERV.UARK.EDU cc: Subject: Re: duplicate dasd volume serial numbers |
On: Thu, Jun 29, 2006 at 05:04:20PM -0500,Steve Gentry Wrote:
} Yes, logic would dictate that the system config file be read first.
} However, since this is a VM "rez" pack (i.e. 520RES, 520PAG, 520SPL,
} 520W01, etc)
} I didn't know if VM would still seek out those packs first before reading
} and thus acting upon the system config file.
There is nothing sacred about those volsers. They can be anything. The
SYSTEM CONFIG file is found early in the IPL because it has to be on the
volume that you IPL'd. Then everything else is found using the volsers
and devaddrs from SYSTEM CONFIG.
--
Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543 1353
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
Canines:Val, Red & Shasta (RIP),Red, Zero & Casey, Siberians Owner:Chinook-L
Retired at the beach Asst Owner:Sibernet-L
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