Hi, In the 90's and early 2000's i worked for a company that used Hiperbatch with a significant performance boost in batch processing.
I don't think is a viable choice anymore, mainly because of Sysplex processing and the evolution of storage subsystems. Best Regards Ituriel do Nascimento Neto z/OS System Programmer Em segunda-feira, 13 de março de 2023 às 14:54:58 BRT, Mark Jacobs <[email protected]> escreveu: Nope. Was never active at $currentjob, $previousjob-1, $previousjob-2, which covers the past 28 years of my career. Mark Jacobs Sent from ProtonMail, Swiss-based encrypted email. GPG Public Key - https://api.protonmail.ch/pks/lookup?op=get&[email protected] ------- Original Message ------- On Monday, March 13th, 2023 at 1:33 PM, Lennie Dymoke-Bradshaw <[email protected]> wrote: > While working at multiple sites I have seen customers activating the DLF > address space often. DLF supports a facility known as Hiperbatch, which was > introduced in the early 1990s. Hiperbatch is a way of making data available > in expanded storage from one job step of a batch job to another job step, > thereby reducing I/O. (Hope you all remember expanded storage folks.) The > manual for Hiperbatch is no longer distributed with those for z/OS but is > still available. It is dated 1994 and is still at Version 1 I believe. DLF > is controlled from the COFDLFxx member of PARMLIB. I understand there are 3 > ways to make a dataset eligible for Hiperbatch assistance, > > 1. Through a RACF profile in the DLFCLASS class > 2. Through the DLF exit (specified in the COFDLFxx member) > 3. Through the OPC/ESA (long since renamed) special resources dialog, > also using a DLF exit. > > > > I think that if DLF is active and the DLFCLASS class is active then each > data set OPEN will cause an extra RACF check to the DLFCLASS class to see if > the data set is eligible. I have seen these checks in zSecure Access > Monitor. > > > > So I have two questions. Number 1 is for most people. > > Is anyone still using Hiperbatch? > > > > Question 2 is for IBM. > > In many cases we can simply not start DLF and inactivate the DLFCLASS class > and thereby save processing cycles. What is the downside to this? > > > > > > Lennie Dymoke-Bradshaw > > https://rsclweb.com/ https://rsclweb.com > > > > 'Dance like no one is watching. Encrypt like everyone is.' > > > > > > > > > > > > > > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
