Re: Extents limit for HFS

2013-11-22 Thread John Gilmore
Bill [Godfrey], Thank you. Alan Starr's explication is persuasive. It has the right sort of murky period flavor: a length value in doublewords kept in a byte! John Gilmore, Ashland, MA 01721 - USA -- For IBM-MAIN subscribe / s

Re: Extents limit for HFS

2013-11-22 Thread Bill Godfrey
om: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On >Behalf Of John Gilmore >Sent: Friday, November 22, 2013 8:53 AM >To: IBM-MAIN@LISTSERV.UA.EDU >Subject: Re: Extents limit for HFS > >For the BLKSIZE= constraint mod(32760,8) = 0, mod(32767,8) �= 0. > >For the

Re: Extents limit for HFS

2013-11-22 Thread Blaicher, Christopher Y.
ake, NJ 07677 P: 201-930-8260 | M: 512-627-3803 E: cblaic...@syncsort.com -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of John Gilmore Sent: Friday, November 22, 2013 8:53 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit f

Re: Extents limit for HFS

2013-11-22 Thread John Gilmore
For the BLKSIZE= constraint mod(32760,8) = 0, mod(32767,8) ¬= 0. For the extents-per-volume question it is hard to see any basis for an alignment issue, and in any case both 123 and 127 are odd. (Of the two 123 is composite and 127 = 2^7 - 1 is a Mersenne prime, but this difference too is unlikel

Re: Extents limit for HFS (UNCLASSIFIED)

2013-11-22 Thread Blaicher, Christopher Y.
627-3803 E: cblaic...@syncsort.com -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Ted MacNEIL Sent: Thursday, November 21, 2013 5:55 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit for HFS (UNCLASSIFIED) Where do the -71 and -16

Re: Extents limit for HFS

2013-11-21 Thread Paul Gilmartin
On Thu, 21 Nov 2013 12:11:46 -0500, John Gilmore wrote: >Why the magic number of 123 extents per volume? 127 is more >plausible. What else is going on here? > Isn't this somewhat akin to my ranting in the past about why the maximum BLKSIZE is 32760 when 32767 is more plausible? -- gil --

Re: Extents limit for HFS (UNCLASSIFIED)

2013-11-21 Thread Ted MacNEIL
Discussion List Subject: Re: Extents limit for HFS (UNCLASSIFIED) Classification: UNCLASSIFIED Caveats: NONE According to my personal notes The restriction of 127 extents per volume (device) comes from the DEB: DEBLNGTH is the number of double-words in the DEB (up to 255 ===> 255 * 8 = 2040

Re: Extents limit for HFS (UNCLASSIFIED)

2013-11-21 Thread Ken Porowski
] Extents limit for HFS (UNCLASSIFIED) The limit of 16 extents per volume for a non-VSAM data set dates back to the mid-1960s and release 1 of OS/360. A Format 1 DSCB has space for 3 extent descriptors and a pointer to a Format 3 DSCB, which has space for 13 more extent descriptors AND ALSO a

Extents limit for HFS

2013-11-21 Thread R.S.
What is current limit of extents for DSORG=PO,DSNTYPE=HFS dataset? -- Radoslaw Skorupka Lodz, Poland -- Treść tej wiadomości może zawierać informacje prawnie chronione Banku przeznaczone wyłącznie do użytku służbowego adresata. Odbiorcą może być jedynie jej adresat z wyłączeniem dostępu o

Re: Extents limit for HFS

2013-11-21 Thread Robert A. Rosenberg
At 18:44 + on 11/21/2013, DASDBILL2 wrote about Re: Extents limit for HFS: I disagree with the other post that mentioned up to five different extents to satisfy the primary size. If this were true, then we wouldn't have a limit of 16 extents for a non-VSAM data set, but rather 1

Re: Extents limit for HFS (UNCLASSIFIED)

2013-11-21 Thread DASDBILL2
#x27;s constraint looks like a reasonable explanation. Bill Fairchild Franklin, TN - Original Message - From: "Lon A CTR USARMY HRC Storr (US)" To: IBM-MAIN@LISTSERV.UA.EDU Sent: Thursday, November 21, 2013 1:11:58 PM Subject: Re: Extents limit for HFS (UNCLASSIFIED)

Re: Extents limit for HFS

2013-11-21 Thread Pommier, Rex
SDBILL2 Sent: Thursday, November 21, 2013 12:45 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit for HFS I think there was some rational explanation given several years ago.  Check the archives, John.  Something about how many whatevers could fit within one such-and-such, where both are c

Re: Extents limit for HFS

2013-11-21 Thread John McKown
On Thu, Nov 21, 2013 at 11:30 AM, R.S. wrote: > W dniu 2013-11-21 18:11, John Gilmore pisze: > > Why the magic number of 123 extents per volume? 127 is more >> plausible. What else is going on here? >> > Well. Why 59 volumes per volume, why 140 bytes per VTOC records? Why DSN > is limited to 4

Re: Extents limit for HFS (UNCLASSIFIED)

2013-11-21 Thread Storr, Lon A CTR USARMY HRC (US)
: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit for HFS (UNCLASSIFIED) Classification: UNCLASSIFIED Caveats: NONE According to my personal notes The restriction of 127 extents per volume (device) comes from the DEB: DEBLNGTH is the number of double-words in the DEB (up to 255 ===> 255 * 8

Re: Extents limit for HFS

2013-11-21 Thread Blaicher, Christopher Y.
-Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of DASDBILL2 Sent: Thursday, November 21, 2013 1:45 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit for HFS I think there was some rational explanation given several years ago. Check the

Re: Extents limit for HFS (UNCLASSIFIED)

2013-11-21 Thread Storr, Lon A CTR USARMY HRC (US)
M-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit for HFS I think there was some rational explanation given several years ago.  Check the archives, John.  Something about how many whatevers could fit within one such-and-such, where both are control blocks within a VSAM catalog structure.   I di

Re: Extents limit for HFS

2013-11-21 Thread Neil Haley
ms/z/ | http://www.about.me/NeilHaley From: "R.S." To: IBM-MAIN@listserv.ua.edu, Date: 11/21/2013 09:09 Subject: Re: Extents limit for HFS Sent by:IBM Mainframe Discussion List HFS limits and requirements changed over the time. It seems description below is

Re: Extents limit for HFS

2013-11-21 Thread Pommier, Rex
ssion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of John Gilmore Sent: Thursday, November 21, 2013 11:12 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Extents limit for HFS Why the magic number of 123 extents per volume? 127 is more plausible. What else is going on here? On 11/21/13,

Re: Extents limit for HFS

2013-11-21 Thread DASDBILL2
Sent: Thursday, November 21, 2013 11:11:46 AM Subject: Re: Extents limit for HFS Why the magic number of 123 extents per volume?  127 is more plausible.   What else is going on here? On 11/21/13, John Eells wrote: > > z/OS DFSMS Using Data Sets, topic 3.9.2.1, "Creating HFS Data Sets&qu

Re: Extents limit for HFS

2013-11-21 Thread Neil Haley
6-4565 From: "R.S." To: IBM-MAIN@listserv.ua.edu, Date: 11/21/2013 08:13 Subject: Extents limit for HFS Sent by:IBM Mainframe Discussion List What is current limit of extents for DSORG=PO,DSNTYPE=HFS dataset? -- Radoslaw Skorupka Lodz, Poland -- Treść tej

Re: Extents limit for HFS

2013-11-21 Thread R.S.
W dniu 2013-11-21 18:11, John Gilmore pisze: Why the magic number of 123 extents per volume? 127 is more plausible. What else is going on here? Well. Why 59 volumes per volume, why 140 bytes per VTOC records? Why DSN is limited to 44 characters? Why IDE HDD limit was stupidly increased from

Re: Extents limit for HFS

2013-11-21 Thread John Gilmore
Why the magic number of 123 extents per volume? 127 is more plausible. What else is going on here? On 11/21/13, John Eells wrote: > > z/OS DFSMS Using Data Sets, topic 3.9.2.1, "Creating HFS Data Sets": > > ... > > These data sets can expand to as many as 255 extents of DASD space on > multipl

Re: Extents limit for HFS

2013-11-21 Thread R.S.
obile: 1-613-266-4565 From: "R.S." To: IBM-MAIN@listserv.ua.edu, Date: 11/21/2013 08:13 Subject:Extents limit for HFS Sent by:IBM Mainframe Discussion List What is current limit of extents for DSORG=PO,DSNTYPE=HFS dataset? -- Radoslaw Skorupka Lodz, Po