On Tue, 17 Jan 2017 09:02:57 -0700, Lizette Koehler <[email protected]> wrote:
>Cross posting to TSO REXX and IBMMAIN > >Long ago IBM Created an APAR OY44087 which provided some guidance and formula >on >how to calculate space for the JES2 Ckpt and Spool space. > >I am looking to create a REXX/ISPF function or Excel to mimic this process. >However it is lacking on how some of the newer control blocks, like BERTS, >would >affect this calculation. > >Does anyone have any idea how to create a process for generating the sizing for >JES2 based on the newer resources that have been added since OY44087? > >I know if I try to increase a resource and there is insufficient space, JES2 >will prevent the change from occurring and then tell me what it needs. I think >issuing the command to "see if it works" is not a really practical method. >Particularly if you really did not want to change it at that time. > >I looking to build a "what-if" tool that could help one validate the JES2 >environment will be able to handle any resource changes. And if it cannot, >then >what should it be raised to. > >Thanks > >Lizette Koehler >statistics: A precise and logical method for stating a half-truth inaccurately I believe the last time IBM documented any kind of CheckPoint Size Calculation was in z/OS V1R1.0 JES2 Initialization and Tuning Guide (SA22-7532-00) . Of course, it's just a wee bit out of date now! I support an inhouse written product that runs on VM/CMS that displays job information from the JES2 Spool and CheckPoint. We have had various versions of a VM/CMS REXX program over the years to calculate the minimum CheckPoint size needed based on several different JES2 settings. The code I have is out of date also, but your query here prompted me to create a new version. It took a while to figure out the various sizes and amounts of the different CheckPoint records. I have tested it with the settings we have for two different JES2 systems that I have access to and it seems to calculate the CheckPoint size correctly. It supports the various CheckPoint Levels thru Z22, (we are currently at Z11). I will email you the REXX code I have since there doesn't seem to be enough interest to post it to the list. The code is pure REXX, (VM/CMS not required), so you can use it as a basis to create an interactive app if you want, by adding a ISPF front-end, or just modify the variables and run it as is. -- Dale R. Smith ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
