On Mon, 24 Mar 2008 16:41:38 -0700, Skip Robinson <[EMAIL PROTECTED]> wrote:
>I dug into the doc once again for more info on Mark's reference to >'striping'. I find this comment in Diagnosis: Tools and Service Aids: > >"Extended format data sets are supported by z/OS V1R6 and later releases. >Extended format sequential data sets can hold 16,777,215 blocks. If you use >a maximum block size, 29120 bytes, approximately 488 GB can fit. You cannot >use striping or compression options for extended format sequential data >sets. You must use the guaranteed free space option to require DFSMS to >reserve space at the time that the data set is created." > >On the other hand: > >"Large format data sets are supported by z/OS V1R7 and later releases. >Large format (DSNTYPE=LARGE) data sets can span 16,777,215 tracks. If you >use a maximum block size, 29120 bytes, approximately 768 GB can fit. " > >I have two Mod-9 volumes with SYS1.SADMP spanning both as DSNTYPE=LARGE for >a total of 20,032 cylinders. I use the AMDSADDD REXX utility to enable SAD >to write data to both volumes in a way I understood as 'logical striping' >(my term). > >Is there a better option? > > FYI... the SADUMP striping has been available since z/OS 1.2. As far as "whats best", there was a good SHARE session from July 2001 given by Greg Dyck - "When the Big Crash Occurs Standalone Dump" Session number 2823. There is still a lot of good information in that and does include the z/OS 1.2 changes. For something more current, there is this: z/OS Best Practices: Large Stand-Alone Dump Handling - Version 2 http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/TD103286 Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:[EMAIL PROTECTED] z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
