If I remember correctly, the first was the Symmetrix 7700 and they were known as "RAID-S" volumes. The small ones were terrific for JES2 checkpoints, RACF databases, MIM control datasets, etc. I remember telling someone I just improved our busiest datasets by 1 millisecond. They said, "So what?" I said, "Let me express it another way. I just improved their response time by 33%! Does that sound better?" <grin>
Bob Richards ________________________________ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of RPN01 Sent: Tuesday, March 06, 2007 4:19 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: DASD cylinders The "mod 27" moniker was selected because the 32,760 size was "roughly" three times a mod 9. The mod 54 is "roughly" three times the mod 27. It would have been too hard to allocate a "3390 mod 29.43396226415". You have actual volumes with 32,760 cylinders because they've been defined that way in your DS8000. If you want 10 cylinder disks, you can probably have that too. I remember an EMC box I used that gave me (memory's bad here...) 4 mod 9 disks, plus a "leftover" 110 cylinder disk per physical volume in the EMC frame. They said to consider the small ones as "really fast" dasd for specific purposes. Some things just need to be taken on faith, and then you move on. -- .~. Robert P. Nix Mayo Foundation /V\ RO-OC-1-13 200 First Street SW / ( ) \ 507-284-0844 Rochester, MN 55905 ^^-^^ ----- "In theory, theory and practice are the same, but in practice, theory and practice are different." > From: Marcy Cortes <[EMAIL PROTECTED]> > Reply-To: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU> > Date: Tue, 6 Mar 2007 14:00:38 -0600 > To: <IBMVM@LISTSERV.UARK.EDU> > Conversation: [IBMVM] DASD cylinders > Subject: Re: DASD cylinders > > How then do I have actual volumes on my system of 32,760 cyls. That's > not divisible by 1113 (ds8000 here). > > > > > Marcy Cortes > > > "This message may contain confidential and/or privileged information. > If you are not the addressee or authorized to receive this for the > addressee, you must not use, copy, disclose, or take any action based on > this message or any information herein. If you have received this > message in error, please advise the sender immediately by reply e-mail > and delete this message. Thank you for your cooperation." > > > -----Original Message----- > From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> On > Behalf Of Jim Elliott <[EMAIL PROTECTED]> > Sent: Tuesday, March 06, 2007 11:55 AM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: [IBMVM] DASD cylinders > >> That's what I think too. Mod 27 and Mod 54 don't exist. I just read >> the ds8000 doc, you can choose 3390 Standard Mod 3, 3390 Standard Mod >> 9, or 3390 Custom Volume. > > Marcy: > >> On the DS8000 family, you can allocate any number of cylinders you >> want, but they must be in multiples of 1113 (a 3390-1) up to a maximum > >> of 60102 cylinders (a 3390-54). Apparently this is different from the >> ESS where you could have any number of cylinders (up to whatever the >> limit was). > > Jim LEGAL DISCLAIMER The information transmitted is intended solely for the individual or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you have received this email in error please contact the sender and delete the material from any computer. SunTrust and Seeing beyond money are federally registered service marks of SunTrust Banks, Inc. [ST:XCL]
