I have been converting our HFS datasets to ZFS. We are now getting contention using ZFS where we were not when using HFS.
I have the same named task (DDL72HFS) running on several systems within the sysplex. The OMVS segment for DDL772HFS contains HOME(/u/DDL72HFS). The first instance of DDL72HFS causes the ZFS to be mounted (via automount). Subsequent instances of DDL72HFS on other systems in the plex cause: MII1038 ZFS CONTENTION WITH ZFS OWNS EXCL ON GLL6 MII1039 ZFS NEEDS EXCL SYSDSN UNIX.DDL72HFS IKJ56225I DATA SET UNIX.DDL72HFS ALREADY IN USE, TRY LATER+ IEF196I IKJ56225I DATA SET UNIX.DDL72HFS ALREADY IN USE, TRY LATER+ IKJ56225I DATA SET IS ALLOCATED TO ANOTHER JOB OR USER IEF196I IKJ56225I DATA SET IS ALLOCATED TO ANOTHER JOB OR USER IOEZ00003E While opening minor device 17401, could not open dataset UNIX.DDL72HFS. We did not see this contention when the datasets were HFS, but since going to ZFS we get these messages. I am guessing that ZFS is using ENQ where HFS was not (or at least not the same ENQ - HFS vs VSAM). What I need to achieve is to remove the contention. I could do this by: a) adding a sysname qualifier to the automount policy in u.map e.g. UNIX.&SYSNAME..<uc-name>. b) changing the HOME setting to /tmp/ddl72hfs Either of these would work for this particular task as it doesn't store anything in its Unix files. However, there are other instances of batch jobs that run on separate systems using the same userid that would need to store persistent data e.g. jobs run with USER=WHL and the OMVS segment for WHL has HOME (/u/whl). This currently causes contention across the two systems for UNIX.WHL dataset. If I change either automount to add a system identifier or HOME to specify /tmp, I lose the persistence of the data that may be stored in the Unix files. How have others managed this situation? Did I miss something? Thanks Andrew Metcalfe Barclays Bank Plc ---------------------------------------------------------------------- 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
