Hi, friends. Somebody said me that "Model 3" was a convention to dasd enough to save 3G of data (in practical, 2,7G). Analog, "Model 9", "Model 27" and "Model 54" is for dasds with 9G, 27G and 54G respectively. For zVM, the convention is that every dasd greater than 10k cylinders is named "Model 9"... Don't ask me why, it is only what I ear... Other storage suppliers, not IBM, called his dasd as "Model M" or "Model P" (or other letter), for their equivalent 3390-27 and 3390-54.
About zVM installation, its matter only for the layout of the mdisks: the VM itself need about 10000 cylinders, plus one dasd for page and other for spool. When used 3390-3, it is divided on 5 address (RES, W01, W02, PAG and SPL). When used 3390-9 (the real size don't matter), only 3 address (RES, PAG and SPL). So simple. If installed on dasd greater than 10k cylinders, only the first 10k off each are really used; due the predefined layout, the remainder cylinders are all "free"... The SPL and PAG can be reallocated to full PAGE and SPOOL, or the free area can be used as MDISK. Caution only to performance, when mixing MDISK with PAGE and SPOOL... Personally, I prefer use it as MDISK with low I/O (RSU, Logs, historical data, Linux 191, etc). ______________________________________________ Clovis From: Marcy Cortes <marcy.d.cor...@wellsfargo.com> To: IBMVM@listserv.uark.edu Date: 09/02/2011 15:51 Subject: Re: z/VM 5.4; 6.1 Sent by: The IBM z/VM Operating System <IBMVM@listserv.uark.edu> > If z/VM could be installed on any model of 3390-3 or greater, why would > they say that it could only be installed on a MOD-3 or a MOD-9? To me > that means that their install process is model specific. So why? A disk with 32760 cylinders is a model 9. Model 27 is just a short hand way of referring to the bigger mod 9s. Marcy
