"BillD" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]> ... > Before SMS came along, it was a good idea to get all the space needed > in the first extent and allocate a 10-20% secondary for > contingencies. This was known to be more efficient.
Why? Why before SMS? With older, real devices, extents could generate larger headmoves which could hirt performance. With current, cached disk devices, this does not count anymore. With faster > devices and SMS maybe getting secondary extents as a matter of course > is no big deal. Coding secondary extents larger than the primary > still makes no sense to me. > It depends, mainly on how much data is created. Compare it to the SPACE=(CYL,(0,100)) for dump datasets that might or might not be used. On the other hand, allocating a large primary extent and releasing unused space is as efficient. Ps: this newsgroup is a mirror of a listserver. Use this listserver to address the majority of this group's population. Information will be automagically inserted below. Kees > Any comments? > > Sincerely, > Bill Davis > Sr. Programmer/Analyst > Good Samaritan Hospital/PHP > ********************************************************************** 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
