While the twists and turns of 'extension' may get a little droll, it is the bedrock cornerstone of this thing we still call MVS after so many decades. We're entitled to use the same old name in defiance of IBM marketing whims because the same old applications still run there without massive intervention. Extensions allow for new function and feature that can be exploited by newer apps while permitting older ones to muddle along as they always have. That spells continuity.
Compare this with Windows, which has the gall to propagate the old moniker while either trashing or requiring total reinstallation of user apps. I'd settle for acrobatic extensions there any day. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile jo.skip.robin...@sce.com From: Norbert Friemel <nf.ibmm...@web.de> To: IBM-MAIN@LISTSERV.UA.EDU, Date: 04/17/2014 04:25 PM Subject: Re: Extended Addressibility (was: ZFS - Allocation Failure) Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Thu, 17 Apr 2014 17:38:12 +0000, DASDBILL2 wrote: >Extended Addressability refers to an attribute of a data set that allows the data set to contain more then 4GB of data. >Extended Format refers to each DASD block's having some extra bytes, called a suffix, added to the end of each data block, and this can happen with data sets that contain fewer than 4GB of data. >EAV stands for Extended Addressability Volumes and refers to an attribute of a volume that allows it to have more than 65,536 (approximately) cylinders on it, regardless of what kinds of data sets are stored there or how large they are. > >These three buzzphrases all have the word "extended" in them, and two of them also have the word "addressability" in them, but they are three different concepts. > EATTR JCL/Data Class-Parameter: A data set with *extended* attributes (format 8 and 9 DSCBs) can reside in the *extended* address space (EAS) on an *extended* address volume (EAV). (EATTR was not available on MVS/eXtended Architecture ;-) Norbert Friemel ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
