Re: Mod 54 dasd on z/VM 5.2

Fri, 10 Nov 2006 08:39:45 -0800

Title: Message
This reminds me of when CMS7 would not allow minidisks on a 3390-9 even if the minidisk was 3338 cylinders or less; it was upset about the device type and ignored the number of cylinders.  Does CMS22 act the same way or does it not care as long as the minidisk is less than 32K cylinders? 
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Steve Wilkins
Sent: Friday, November 10, 2006 10:50 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Mod 54 dasd on z/VM 5.2

Well....looks like I've been busted! There are a couple of caveats.

Yes, CP supports it, but here are a few restrictions :
- CMS can only access a disk of 32,767 cylinders or less
- A (virtual) minidisk that is greater than 32,767 cylinders is not eligible for minidisk cache regardless of what is marked in the directory or conf file.
- A real disk track will not be brought into the minidisk cache if it exists above real cylinder 32,767 with recent APAR VM64115.

Regards, Steve.

Steve Wilkins
IBM z/VM Development
Inactive hide details for "Stracka, James (GTI)" <[EMAIL PROTECTED]>"Stracka, James (GTI)" <[EMAIL PROTECTED]>


          "Stracka, James (GTI)" <[EMAIL PROTECTED]>
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          11/10/2006 10:17 AM

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Re: Mod 54 dasd on z/VM 5.2

Both CMS general users as well as CP?
      -----Original Message-----
      From:       The IBM z/VM Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] On Behalf Of Steve Wilkins
      Sent:       Friday, November 10, 2006 10:01 AM
      To:       IBMVM@LISTSERV.UARK.EDU
      Subject:       Re: Mod 54 dasd on z/VM 5.2

      For the original question: Yes, VM 5.2.0 (as well as 5.1.0) supports a 3390 mod-54 DASD.

      Regards, Steve.

      Steve Wilkins
      IBM z/VM Development
      Ronald van der Laan <[EMAIL PROTECTED]>

                      Ronald van der Laan <[EMAIL PROTECTED]>
                      Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>

                      11/10/2006 09:51 AM

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      The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>
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      Subject
      Re: Mod 54 dasd on z/VM 5.2

      Tom,

      The CP Planning and Adminstration guide: (2.9.4.3.3 Placing of the CSE Area, table 14)
      http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/HCSG0B11/2.9.4.3.3?SHELF=hcsh2a80&DT=20060516094207#TBLDEVMAP

      Shows for 3390-9 type dasd a maximun of 65520 cylinders.

      Ronald van der Laan


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