On Sat, 12 May 2007 01:34:38 +0100, Tony <[EMAIL PROTECTED]> wrote: >I don't know the answer. It may be in a Redbook.
I doubt it. I've never seen any reccomendation that directories be allocated so that they will fill up tracks. >I would think that the >starting point for any disk search is a track+cylinder location. That's correct >These have >become irrelevant or insignificant with virtual/raid devices. No. 3390 CKD is emulated on modern DASD. -- Tom Marchant > >-----Original Message----- >From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] >Behalf Of Tom Marchant >> >>Yes, Search key High or Equal is used for PDS directrory search. And the >>search will complete with the last used directory block, whose key is eight >>bytes of x'FF'. The key to a directory block other than the last is thelast >>member name in that block. That doesn't explain why you'd want the >>directory to be allocated in full tracks, though. ---------------------------------------------------------------------- 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
