Most people are running on VIRTUAL disks anyway. z/os may "see" a 2105 or a 2107 but in most cases its tiny little brown round and spinning in RAID 5 on the SAN so it doesn't much matter any more. We used to place datasets on disks in accordance to their activity level and distance from the VTOC. To check your work you could open the door, look into the HDA and watch how much the actuator was bouncing around.
Ken Klein Sr. Systems Programmer Kentucky Farm Bureau Insurance - Louisville [email protected] 502-495-5000 x7011 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Ron Hawkins Sent: Tuesday, June 23, 2009 3:52 PM To: [email protected] Subject: Re: SMS Dataset Allocation Problem Ted, It was not DB2 that had a problem. It was CICS and a few batch jobs. I don't have a problem with multi-volume datasets at all, and in fact I design SMS to allocate large datasets on as many volumes as possible. It was simply having so many candidate volumes for every dataset, 1 track or 1 pack, was excessive and we started having TIOT blow outs. I think we were using 20 for the unit count when the problem happened. We ended up using 5 for both VSAM and PS and, let SRS from DTS look after adding volumes beyond five. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Ted MacNEIL > Sent: Tuesday, June 23, 2009 12:21 PM > To: [email protected] > Subject: Re: [IBM-MAIN] SMS Dataset Allocation Problem > > >TIOT > > Set it to the max, and (in general) it won't be an issue. > And, IIRC, DB2 uses a different type of table for allocation. > The number of datasets it can allocate is way beyond what the TIOT, in theory, > allows for. > > (This was about DB2, originally). > - > Too busy driving to stop for gas! > > ---------------------------------------------------------------------- > 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
