On Tue, 6 May 2008 09:05:34 -0400, John Kington wrote: >Tom Marchant wrote: >> >>I think it's unlikely that the volume is so fragmented that the first >>extent allocated was only 1 cylinder, but that he was able to >>obtain a total of 220 cylinders in 12 extents. It is especially >>unlikely considering that the secondary allocation is 20 cylinders. > >My understanding is that allocation is using first fit strategy and the >first extent could be only one cylinder if the next four extents equal or >exceed 249 cylinders.
First fit may very well be the strategy that is used, but DADSM tries to provide the primary allocation in one extent. I always thought that when the primary allocation had to be done in multiple extents that the first extent is the largest. Perhaps someone will correct me if I'm mistaken. >The primary allocation amount for nonvsam datasets is >not retained after the creating job completes. That is true. -- Tom Marchant ---------------------------------------------------------------------- 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
