On Wed, 26 Mar 2008 16:47:36 -0500, Greg Shirey <[EMAIL PROTECTED]> wrote:
>According to this (somewhat old) redbook, the same amount of space is >used. >http://www.redbooks.ibm.com/redbooks/pdfs/sg246979.pdf > >From the "SMS enhancements" chapter: >"If a data set, with one primary and five candidate volumes was in a >data class with a DVC of less than 7, then 24 bytes of TIOT space is >required. If the same data set was using a data class with a DVC of 20, >then it would require 80 bytes of TIOT space." > Thanks. So no difference with DVC in respect to TIOT usage. So going back to Ted's post that I was responding to - It does matter and I wouldn't code volume count or DVC of 59 as a matter of habit just because I could. >It also says this: >"Note: DVC for VSAM striped data sets is supported even though they are >not eligible for Space Constraint Relief." > >Is that more or less confusing? :-) > Less. Because it made me realize that someone must have been trying to change the z/OS 1.6 manual to clarify what the support was for DVC with VSAM striped data sets and instead wrote DVC was supported *only* for multi-striped VSAM data sets. A *HUGE* difference! This part of the manual was corrected (really re-written) for z/OS 1.7. I just happened to open up the 1.6 version because I had 1.6 through 1.9 on my lan bookshelf list and that one was first. However, the manual update (though z/OS 1.9) for DVC no longer mentions VSAM striped data sets specifically, instead it spells out what DVC is not supported for and also has this note: "Dynamic volume count support when a data set extends is a function of access method end-of-volume (EOV) processing and not the data set type. For products that do not use the standard IBM access method EOV interface for their data sets, DVC may not be supported. Please consult with your product representative to see if it supports dynamic volume count." Regards, 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
