Mike, 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.
Tom Harper -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Mike Bell Sent: Monday, December 19, 2005 3:35 PM To: [email protected] Subject: Re: Maximum Extents in z/OS 1.4 Actually hasn't changed if still single volume - from DFSMS manual.forsecqty - Allocates an amount of space each time the cluster extends, as a secondary extent. You can use this secondary allocation to add space for the data or index components of the cluster. A VSAM data set can be expanded to 123 extents per volume. If this is a multi-volume VSAM data set, then the VSAM component can be extended to a maximum of 255 extents combined over all volumes. Mike On 12/19/05, Miller, Pat <[EMAIL PROTECTED]> wrote: > > The maximum number of extents for both sequential and VSAM appear to have > changed going from OS/390 2.10 to z/OS 1.4. Anybody know these numbers > off > the top of your heads? Also, where this is documented? > > ---------------------------------------------------------------------- > 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 > -- Mike ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
