CICS/VSAM transparency may not solve this problem. You would need to implement DB2 data sharing and that's not simple if you don't already use data sharing.
ISI Pty in Melbourne also market a VSAM transparency product. I supported this product for many years and it is still in use at one large Australian bank. The ISI version works better than the IBM product which was a bought-in product from a 3rd party vendor. For less complex VSAM applications, I considered trying to transform VSAM read/writes to CF equivalents because the code path overhead is large for high volume VSAM I/O. The magic is in the intercepts for batch and CICS. On Wed, Mar 8, 2023 at 12:57 PM Dale R. Smith <[email protected]> wrote: > On Wed, 8 Mar 2023 11:35:09 +1300, Laurence Chiu <[email protected]> wrote: > > >Just to explain why we need two LPARs. The application uses a VSAM dataset > >which is updated for all incoming transactions. If we want to run two > >instances of that application on two different LPARs to provide > >availability even if one of the LPARs goes offline for any reason, then > the > >VSAM dataset needs to be shared across the two instances when both are > >running to support concurrent access. > > > >The only other option for the two LPARs on the same CEC is possibly VSAM > >ShareOptions but given this is a package from a vendor, it might not be > >coded to support the right queueing and de-queueing of access to that > >dataset. > > IBM has a product called "CICS VSAM Transparency for z/OS" that claims you > can migrate VSAM Files to Db2 Tables without having to change any program > code. > https://www.ibm.com/support/pages/ibm-cics-vsam-transparency-zos > > From the web page: > > IBM CICS VSAM Transparency for z/OS > > Helps you migrate valuable data from VSAM files to Db2 tables in a manner > that can evolve as business needs change > > IBM® CICS® VSAM Transparency helps you move valuable data from VSAM files > to Db2® tables. This migration can evolve as your business requirements > dictate, without having to modify your CICS® and batch VSAM application > programs. You can access the Db2® data 24x7, as well as integrate your data > with new and existing Db2® applications, preserving your core investments > and avoiding costly application rewrites. > > I'm sure it's not cheap, but it would allow you to share the data and it > may be cheaper than what you would need to do to share a VSAM file. > > I have no experience with the product so I don't know if it works as > advertised. > > -- > Dale R. Smith > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Wayne V. Bickerdike ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
