Gil, That was probably written 20 years ago when a volume meant a SLED and it would have been prudent to protect yourself against a disk failure. With RAID the need for separate volumes for these backups is debatable.
To get the same hardware separation with RAID you need a map of Device Number and Array Group to figure out which volumes share common disk drives. With parity and dynamic sparing protection you would probably be making your life way more complex than it needs to be. I would not blindly follow every recommendation like this from IBM. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Gilbert Cardenas > Sent: Wednesday, August 12, 2009 8:27 AM > To: [email protected] > Subject: Re: [IBM-MAIN] Backing up CDS's to DASD > > Thanks for the info Dave. The section I was reading was in the z/OS > 1.9 Admin Guide Chapter 12 page 474 that says: > > If you decide to back up the control data sets and journal data set to > DASD, you must preallocate the data sets. Also, allocate the different > versions of the backup data sets on different volumes. This better > ensures that you can recover your backup versions. > > What you say makes more sense than the above when using SMS. > > Thanks again, > Gil. > > ---------------------------------------------------------------------- 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
