Been seeing many comments about migrating from HFS to zFS and one comment had the statement of the performance boost (heard it at SHARE) coming in z/OS V1R11. Indeed this is true for where one will see it (too lengthy to explain here). Yes, there were many zFS sessions I attended at the last SHARE but one was memorable. An new feature is being added in z/OS V1R11 where the one system which owns zFS amongst all of the systems may start out on one system you choose but will migrated around to where "it" thinks it will get the "best" peformance.
We in the room asked the questions, "Can this movement be controlled?" Answer was "NO". "Is their a command to move it just in case we have to move it based on non- performance reasons?" "NO" "Gee, is there something telling us it is moving or has moved?" "NO" "OK, is the something which gives us a hint why it moved?" "NO, just that you will have to trust us to do what is in your best interest" "To move if off an LPAR which has it, how do we do it?" "IPL and it will move" "So do we specify where it will move?" "No" "Hey, might it move back to where it was after the IPL?" "If it is deemed by IBM, that is the best place for performance. Soooooo why would you not want it any other place?" Learned there is a parameter which is defaulted to keep it working like it does today but once you select the "NEW zFS Super-dupper Performance Option", then you get the GOOD, BAD, and UGLY plus a bunch of unknowns. The IBM Speaker was mystified why we were wanting any kind of control just in case it moved someplace it might not want to be based upon our (and not IBM's) desire(s). In his defense he was taking a lot of notes and maybe our suggestions will show up someplace in the future. But in the end he was still mystified why anyone would want any control over IBM doing this to get really better performance. Gee, seems like I heard that kind of thought back in the 20th Century. jim ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
