After reviewing the article, I don't see it will have that much of an impact. It requires that an entire Control Area (CA) (cylinder) become empty before it can reuse it. If you do have a KSDS that does require reorg because CAs become empty, it will greatly help that dataset. I. E. a dataset ordered by date and you delete the oldest dates. These tend to be ESDS datasets, so converting them to KSDS and building the key yourself could help a great deal.
Your Mileage WILL Vary greatly depending on the dataset design. On Wed, Jun 15, 2011 at 1:17 PM, Greg Shirey <[email protected]> wrote: > Well, not to answer my own question, but I had a reply off-list that pointed > me at z/OS Newsletter Hot Topics February (#24) issue that talks about CA > reclaim (page 44). It includes some methods of judging whether CA Reclaim is > effective. So thanks for the response, and for anyone else interested, > here's the URL: > > http://www-03.ibm.com/systems/z/os/zos/bkserv/hot_topics.html > > Regards, > Greg > > -----Original Message----- > From: IBM Mainframe Discussion List On Behalf Of Greg Shirey > Sent: Wednesday, June 15, 2011 10:38 AM > To: [email protected] > Subject: CA reclaim benefits > > Hello all, > > We are migrating to z/OS 1.12 soon, and we were contemplating how we might > measure the benefit of the CA Reclaim feature. > > Will we be able re-allocate our VSAM files with less freespace, or smaller > secondaries, or smaller primaries? Or is the only ROI, so to speak, not > having to schedule reorg jobs? > > Has anyone worked on measuring this? Can you share your strategy? > > ---------------------------------------------------------------------- > 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 A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- 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
