1. No problem, defaults are there to be overruled. 2. I don't understand the new value, we use the largest non-EAV volumes on our '3390-58's, with 64554 Cyls, which is 58 chunks of 3390-01's. 3. Indeed.
Kees. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of R.S. > Sent: 09 January, 2018 14:06 > To: [email protected] > Subject: Re: Number of Cylinders per Volume > > 1. This is default, it can be changed. > 2. The rationale behind the change is the space is allocated in "chunks" > of 1113 cylinder, so 32760 means one looses 630 cyl for every volume > (and 147 cyl for mod-54). From the other hand there is nothing magic in > "round numbers" like 32760 or 65520. > 3. "Serious issues" during migration could happen or not. For dataset > migration no issues. For volume migration an pair "old-new" has to be > consistent which may be inefficient. > > -- > Radoslaw Skorupka > Lodz, Poland > > > > > > > W dniu 2018-01-09 o 13:49, Mazer Ken G pisze: > > While configuring CKD storage on a new IBM DS8880 I discovered that > the default number of cylinders for a 3390-27 and a 3390-54 has changed. > > Caution should be taken when your defining new storage. > > > > I've always assumed that a 3390-27 had 32,760 cylinders. Not the case > anymore, if using the GUI and the DISK or Mod1 calculations. You end up > getting 30,051 cylinders. > > I've also assumed that a 3390-54 had 65,520 cylinders. Now the > default number of cylinders is 60,102. > > > > These new calculations are now divisible evenly by 1113, a 3390 Mod-1 > > > > If you have a need to define these two volumes sizes please keep this > in mind as this could cause serious issues when trying to migrate from > the older volume sizes to the newer sizes. > > I did find the new smaller sizes documented in the DS8870 & DS8880 > Architecture and Implementation Redbooks. > > > > Ken Mazer > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO IBM-MAIN > > . > > > > ====================================================================== > > > -- > Treść tej wiadomości może zawierać informacje prawnie chronione Banku > przeznaczone wyłącznie do użytku służbowego adresata. Odbiorcą może być > jedynie jej adresat z wyłączeniem dostępu osób trzecich. 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