On Wed, 21 Jan 2009 06:35:09 -0600, Spencer, Mike <mike_spen...@bmc.com> wrote:
>Bob, >Using Dynamic Volume Count in the DFSMS Dataclas is terribly >inefficient. The Dynamic Volume Count is used to determine the size of >the TIOT, TCTTIOT, and JFCB control blocks when allocating a data set. >What this means is that with a DVC of 58, every data set using this data >class is using 2052 bytes of unused storage (57 x 36 bytes) regardless >of the actual number of logical volumes used. This may not be an issue >depending on your processor hardware, but it does add up as this storage >is never released until the data set is deleted from the system. The >StopX37 product does not use allocate storage in the same fashion as >DFSMS, so the process is more efficient from a storage standpoint. >If cost is an issue, I would consider looking at other ISV options. > > It's still much better than "the old way" (volume count) that stored the number of entries in the catalog! :-) Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
