Hello everyone, I received some information back from IBM. *If data loss cannot be tolerated at the DR site, STG_DUPLEX in the LOGSTREAM definition must be set as YES.* *CICS cannot tolerate LOGSTREAM data loss.*
Just sharing information here, in case someone runs into a similar situation in the future. On Wed, Aug 28, 2019 at 7:34 PM Cameron Conacher <[email protected]> wrote: > Hello folks, > I have a question and precious little information. > We use CDC IIDR to support replicating VSAM file updates downstream from > our CIC applications. > > We have a LOGSTREAM defined in the Coupling Facility of our SYSPLEX. > Apparently, there is a VSAM file that is defined behind the CF LOGSTREAM. > I know very little about this. We simply requested the LOGSTREAM to be > made available to our CICS Regions, and our IBM resources waved their magic > wands and it was there. > > Anyway, I pro-actively defined all LOGSTREAMs that we would be requiring > for production, well ahead of when we would actually require them. > > Sometime later but before we installed out application change we ran a > Disaster Recovery test event. > When the DR event ran, there was a hiccup with our LOGSTREAM. > Sadly no diagnostic information was collected and saved. > I had our IBM folks redefine the LOGSTREAM and we were back in business. > > So, I now have a couple of questions for anyone that can help me > understand things. > > At the time CF structures are defined, is the VSAM file also automatically > defined? > Are these two separate/distinct steps? > > When Coupling Facility structures are defined, would this definition be > part a "normal" mirroring process that manages DR? > Is the LOGSTREAM something special I should call out to IBM to indicate it > requires DR attention? > Assuming that file systems are mirrored even for the CF, would data in the > LOGSTREAM VSAM file be mirrored to the DR site? > Would it make any difference if the VSAM file were never used, and > therefore present as an unloaded (never used) VSAM file? > I assume that a never used VSAM file would have nothing mirrored to the DR > site. > Would that present any difficulties to starting the DR site? > Maybe the VSAM file is automatically defined for the LOGSTREAM at SYSPLEX > startup time, if none is available from the catalog? > But if one is available in the catalog, maybe it cannot be in an unloaded > state at SYSPLEX startup time? > > Anyway I would appreciate any information anyone might share. I am just > curious about this at the moment. > I do not have a burning problem. I would simply like to understand a bit > better. > > Thanks > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
