On Tue, 2 Sep 2008 17:48:28 -0500, Andrew Metcalfe <[EMAIL PROTECTED]> wrote:
>We are not using shared ZFS (or HFS for that matter). We merged three >plexes into 1 a couple of years ago (for charging reasons), and we only share >the minimum dasd to allow the plex to work (Couple/logger etc). All systems in >the plex are in the same MII-plex, but have their own MAS, RACF d/b, SMS >environment, Unix environment. We cannot use shared ZFS, as all systems >need to have access to any datasetst that are shared and this is not how our >dasd is setup. We are actively working toward a single RACF d/b, single JES >environment but slowly! The sharing environment can be a subset of the sysplex (IOW, not all systems have to participate). > >The common MII environment means that we occaisionally get some false >contention for same named datasets but is manageable. > >We never saw contention with HFS - I need to check the propogation of >SYSZDSN in MII, but now we are seeing contention with ZFS - I assume a >Vsam major name is getting propogated for ZFS when (perhaps) SYSZDSN was >not - -need to check tomorrow. > >That said, I can put a system name in the automount policy, but if a batch >job runs on a different system it will store data into different datasets and >therefore potentially not have the latest data. > >e.g. job ABC runs with USER=DEF on system A and the automount causes ZFS >file UNIX.SYSA.DEF to be mounted. If the job saves data in this ZFS and later >runs on system B (which will mount UNIX.SYSB.DEF), it will not have the latest >version of the data. > So the same HFS data set was shared R/W before even though you didn't have a shared file system environment, correct? And you never ran into problems or r/w sync errors? Based on what you wrote above, a shared file system between SYSA and SYSB is a requirement or you have to force the jobs that are writing to and reading the HFS / zFS to run on the same LPAR. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:[EMAIL PROTECTED] z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
