John, your definition should work just fine. It has been a while that I looked at HSM control files so I did a little testing. Depending on how much space you have on your HSM002 volume you could go as high as 5,800 cyls. With that size you would get a HI-A-RBA of 4262952960. Depending on how you do the calculation you would get around 3.97 gig.
Just as a side note the MCDS can be an extended format dataset. Thanks.. Paul Feller AGT Mainframe Technical Support -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of John Dawes Sent: Tuesday, November 27, 2018 8:52 AM To: [email protected] Subject: Re: SMS ALLOCATION OF VSAM DSN [EXTERNAL] Paul, Thanks for the info. I am trying to define the HSM MCDS at a maximum number of cylinders. Below is the DEFINE CLUSTER: DEFINECLUSTER - (NAME(PROD..HSM.MCDS) VOLUME(HSM002) - CYLINDER(4300 0) - RECORDSIZE(435 2040) FREESPACE(0 0)- SPEED BUFFERSPACE(530432) - INDEXED KEYS(44 0) SHAREOPTIONS(3 3)- UNIQUE NOWRITECHECK) - DATA (NAME(PROD..HSM.MCDS.DATA) CISZ(12288) ) - INDEX (NAME(PROD..HSM.MCDS.INDEX) CISZ(2048)) I think I am safe. What says you? On Monday, 26 November 2018, 7:15:32 pm GMT-5, Feller, Paul <[email protected]> wrote: John, basically you are limited to 4 gig (HI-A-RBA) for the size of a non-extended VSAM dataset. So depending on your VSAM define option you will get somewhere in the neighborhood of 6,000 cyls. In my quick test I got around 5,800 cyls. Thanks.. Paul Feller AGT Mainframe Technical Support -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of John Dawes Sent: Monday, November 26, 2018 12:30 PM To: [email protected] Subject: SMS ALLOCATION OF VSAM DSN [EXTERNAL] G'Day, Could somebody please tell me what is the maximum number of cylinders that could be allocated for a SMS managed VSAM dsn (not VSAM EXTENDED ADDRESSABILITY). I have been able to allocate a dsn with 6,000 cylinders. However, due to a lack of disk space I couldn't continue with a higher allocation. Thanks. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- Please note: This message originated outside your organization. Please use caution when opening links or attachments. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
