The dynamic allocation space calculations are going to be based on the DYNALLOC number. As a simple example, if DFSORT calculates that it needs 6,000 cylinders of work space, and DYNALLOC=4 with DYNAPCT=50, it will need 4 volumes with at least 1500 cylinders of free space. But with DYNALLOC=6 and DYNAPCT=10, it will need 6 volumes with at least 1,000 cylinders of free space. The work data sets allocated for DYNAPCT are not factored into the initial work space allocation. Rather they are allocated with zero space and only extended later on if the sort unexpectedly requires more space and the initial DYNALLOC work data sets have been exhausted. So my suggestion would be to increase DYNALLOC to 6.
Have a nice day, Dave Betten z/OS Performance Specialist Cloud and Systems Performance IBM Corporation email: [email protected] IBM Mainframe Discussion List <[email protected]> wrote on 07/25/2016 04:30:16 AM: > From: "Vernooij, CP (ITOPT1) - KLM" <[email protected]> > To: [email protected] > Date: 07/25/2016 04:31 AM > Subject: DFSORT DYNALLOC/DYNAPCT question > Sent by: IBM Mainframe Discussion List <[email protected]> > > Hello DFSORT experts, > > The DYNALLOC description says that the default number of SORTWKs is > 4 and not to specify an unnecessary high number. > The DYNAPCT parameter allocates an extra number of SORTWKs to be > used in case the DYNALLOC number of SORTWKs appears to be not enough. > > I can: > > a. raise the DYNALLOC default to 6 SORTWKs > > b. set the DYNAPCT value to 50 > In each case 6 SORTWKs are allocated. What is the difference and > what is advisable? > > 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: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
