On Mon, 19 Dec 2005 15:38:26 -0600, Tom Harper <[EMAIL PROTECTED]> wrote:
> >You are correct, however, there was a big change starting in some z/OS >release (I'm not sure which), in which a new extent could be combined >with an old extent on the same volume, if they were adjacent. This made >it appear as though more extents on a single volume could be obtained, >since the new combined extent appeared as a single extent. > I think you are referring to the VSAM Extent Reduction in z/OS 1.4: http://tinyurl.com/au7b3 "VSAM Extent Reduction: The number of extents allowed with VSAM is 255 per data set. VSAM End of Volume processing will be enhanced to attempt to enlarge adjacent extents when extending on the same volume. The enhancement will reduce the total number of extents, and thus reduce the requirement to defrag volumes with VSAM data." Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America and Farmers Insurance Group mailto: [EMAIL PROTECTED] Systems Programming expert at http://Search390.com/ateExperts/ 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
