There is also a product from Dino software called Real Time Defrag. Thanks....Rick
-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Ron Hawkins Sent: Tuesday, September 16, 2008 4:08 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Efficient defrag? Not for weekends only... Itschak, The result of course is that you will *need* more free space satisfying Primary allocation with large contiguous extents, than if you use allocation recovery software built into SMS, or better still a third party product. My experience is that the 3rd party products allow me to run at 10-15% Freespace, whereas I needed 30-40% and a lot of JCL amendments without. One site had 2-3 space abends a night and needed daily DEFRAGS just to survive. After fine tuning ACC/SRS we were down to less than two space abends a month and reclaimed 20% of the Batch Storgrup. And of course never ending JCL amendments went away... But to your question, the only product I can think of that will do what you want is LDMF, which will mean migrating the fragmented dataset(s) onto another volume. Net/net you may as well allocate the datasets that are failing allocation on the other volume and defrag that volume when they are closed. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Itschak Mugzach > Sent: Tuesday, September 16, 2008 12:45 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: [IBM-MAIN] Efficient defrag? Not for weekends only... > > Hello Ron, > > The problem is indeed in allocation, usually on the first allocation > unit > (DS creation). I don't want StopX or other [product to resize it. I > want to > have free space. If space is stripped, I want to reclaim the space into > contiguous area. The problem is that many datasets on the volume are in > use > and are not moved. > > Itschak > > On Mon, Sep 15, 2008 at 8:42 PM, Ron Hawkins > <[EMAIL PROTECTED]>wrote: > > > Itschak, > > > > One thing where Mainframe totally outstrips open systems is file > structure. > > Unlike Windows theirs is almost no performance benefit whatsoever to > be > > gained from Defragging your volumes. > > > > If you are having allocation problems, then the money would be better > spent > > on Software like ACC/SRS or Stop-x37. > > > > Ron > > > > > -----Original Message----- > > > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] > On > > > Behalf Of Itschak Mugzach > > > Sent: Monday, September 15, 2008 10:26 AM > > > To: IBM-MAIN@BAMA.UA.EDU > > > Subject: [IBM-MAIN] Efficient defrag? Not for weekends only... > > > > > > Defrag (DSS) is not a much help if part of the datasets on the > volume > > > are > > > in-use. I wonder if there is a defrag product that can use hardware > > > technologies (I'll accept software solutions as well ;-) ) to re- > map > > > moved > > > cylinders. The fact is that all sites I know uses Defrag mainly on > > > weekends > > > and effciency is poor. If you have a DB2 subsys that runs 7X24, or > > > CICS, you > > > can't stop the databases and defrag is not much helpful. Thanks for > > > your > > > ideas. > > > > > > Itschak > > > > > > ------------------------------------------------------------------- > --- > > > 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 > > > > > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
