"Paul Gilmartin" <[email protected]> wrote in message news:<listserv%[email protected]>... > On Fri, 10 Jul 2009 14:51:10 -0400, Bob Rutledge wrote: > > > > From the z/OS V1.11 Preview, > > > >"In z/OS V1.11, DFSMSdfp processing is planned to be changed to indicate > >end-of-file (EOF) during the allocation of data sets on DASD that are not > >SMS-managed and have either sequential or an undefined data set organization." > > > "Indicate" is an interesting word. It doesn't say it physically > writes an end-of-file. Is this a logical rather than physical > end-of-file. > > Is this for data security or convenience? Can the residual > data still be read with EXCP? >
I think 'indicate' is the same method as for SMS datasets. AFAIK DS1LSTAR is set to zeros and the Acces Methods 'know' then that this is an empty dataset. These datasets can occupy 0 tracks, which is pysically impossible if a EOF was written in the dataset. Secondly, the EXCP question is similar to the 7 sysprogs and the ligthbulb (and please don't reply if there were 5 or 8): if you need to securely delete your data, delete it with the EREASE feature. Any other 'delete' will leave the data on the track and is therefor unsecure. I can think of a dozen ways to read it. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
