The short answer to your question is YES, there is a difference between how a dataset expands into secondary extents when its SC specifies "guaranteed space".
I don't have time to look this up but I believe it works as follows (i.e. AFTER the primary space amount has been allocated on a volume): 1) Allocate additional secondary extents (specified secondary size) on the primary volume. 2) When the primary volume has no more space, search for a "candidate with space" (i.e. another volume in the same SG that can accommodate all of the space currently allocated on the primary volume [both the primary and secondary extents]). There may be a difference between VSAM and non-VSAM (i.e. for non-VSAM it may look only for the primary quantity, I can't recall exactly). 3) Without "guaranteed space", it looks for a candidate volume that can accommodate the specified secondary quantity. That's how I believe it works. You can verify in the "Using Datasets" manual. Cheers, Alan -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, July 14, 2011 11:34 AM To: [email protected] Subject: Does SMS 'guaranteed space' attribute affect extents of data after Rep ro with 'reuse' What affect is there when using an SMS storage group with the 'guaranteed space' option with respect to performing an IDCAMS REPRO (with the REUSE option)? I am interested in knowing if the location of the extents would or (would not) change depending on whether or not the 'guaranteed space' option is specified. Thanks for any input. ____________________________________________________________ President Lowers Rates Mortgage Rates Hit 2.75%. As Seen On Good Morning America! http://thirdpartyoffers.netzero.net/TGL3231/4e1f36e9e26b7403d49st02duc ---------------------------------------------------------------------- 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
