Barbara Nitz kindly wrote: > Also, I seem to remember that the checkpoint is always serialized via RESERVE.
True. See JES2 Init and Tuning Guide (z/OS v1.12): "For the checkpoint data set(s) that reside on a DASD volume, JES2 processing uses RESERVE and RELEASE logic with a software checkpoint lock to prevent JES2 members from simultaneously referencing and updating information kept in the checkpoint data set." >I don't see any reason not to change the RNLS, as then JES shouldn't have any >reason to even be aware that there is another JES on another system. Perhaps, but also from same book, this quote: "For checkpoint data sets residing on DASD, IBM suggests that you add the checkpoint data set(s) to the RESERVE conversion resource exclusion name list (RNL) to prevent global resource serialization (GRS) from limiting access to that data set and degrading performance." For your other questions, I leave it to other gurus to help you... ;-) Groete / Greetings Elardus Engelbrecht ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
