ISTR that SMS will put an EOF at the beginning of a newly allocated SMS-managed dataset if/when SMS determines that the dataset's DSORG=PS. It didn't seem to matter if this information came from the DATACLAS or DD statement.
I don't remember where it was documented, only that I stumbled across it while on a mission to eliminate datasets that HSM wouldn't migrate because they'd never been opened. Tom -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Ron Hawkins <[EMAIL PROTECTED] LE.COM> To Sent by: IBM IBM-MAIN@BAMA.UA.EDU Mainframe cc Discussion List <[EMAIL PROTECTED] Subject .EDU> Re: ps dataset 02/14/2007 07:44 PM Please respond to IBM Mainframe Discussion List <[EMAIL PROTECTED] .EDU> Ted, I've searched for a definitive reference on this but nothing turned up quickly. However, every reference I did find specifies that the EOF is written for SMS Managed Datasets. A DATACLAS can be used by both SMS and non-SMS managed datasets, but a dataset is not SMS managed unless it has a STORCLAS and ultimately gets allocated to an SMS Volume. So I'm led to believe that the presence of a DATACLAS does not cause SMS to write an EOF when allocating a non-SMS dataset. Ron > > Data Class is the only optional construct under SMS. > If you have it defined for the dataset (through the ACS routines) the EOF > will be there. > SMS opens and closes the data set to ensure the DCB is enforced. > Without it, and without SMS, this is not done. > > Funny, I thought I said this a day or so ago. > Either my post didn't go through, or nobody read it. ---------------------------------------------------------------------- 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