There are more benefits from RLS for catalogs then only performance: >From the z/OS 2.1 Roadshow, brought by the always enthusiastic Frank Kyne, >(where he announced his move to Cheryll). - performance: much more caching space and enq'ing on the record i.s.o. on the catalog - availability: no more downtime splitting of catalogs for performance reasons and other maintenance. - integrity: simultaneous updates by utilities and CAS and Sysplex level control of closing and serializing catalogs - recovery: no more long and error prone forward recovery.
Kees. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of R.S. Sent: 08 December, 2015 17:09 To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: RLS implementation for CDS's in DFHSM RLS does require CF (coupling facility). Not everyone has CF. Assuming one get internal CF for free, there's still effort to transform monoplex to parallel sysplex (even single-member one). And the risk of outage when something goes wrong. Q: What is the performance gain from having Catalog in RLS? -- Radoslaw Skorupka Lodz, Poland W dniu 2015-12-08 o 13:56, Vernooij, CP (ITOPT1) - KLM pisze: > Is RLS really so few used or so scary? > > I remember a quote from a z/OS course where RLS for Catalogs was introduced. > The Catalog people asked the VSAM people all kinds of questions because they > were afraid of consequences. The VSAM people replied: come on, your catalog > is only a KSDS, so why are you afraid of RLS? Thereby implying that RLS is so > common and reliable that nobody should worry about it anymore. > > Is it that common and reliable? > > Kees. > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Kenneth J. Kripke > Sent: 08 December, 2015 9:38 > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: RLS implementation for CDS's in DFHSM > > This is an inquiry to see if there are shops that have implemented Record > Level Sharing for their CDS's in DFHSM. > > 1. Concerns are how frequent have other shops experienced failures in > the SMSVSAM asid. > > 2. Do you have multiple ARCMDxx members to cover in the event of an > SMSVSAM outage? > > 3. Have you had to go through a recovery scenario due to an SMSVSAM > outage? > > > > > > Sincerely; > > > > Kenneth J. Kripke > > > > Kenneth J. 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