On Sat, 6 Sep 2008 10:50:13 -0400, Lizette Koehler <[EMAIL PROTECTED]> wrote:
>A vendor has requested I update my GRS entries to the following statements: > > RNLDEF RNL(CON) TYPE(GENERIC) QNAME(SYSVTOC) > RNLDEF RNL(CON) TYPE(GENERIC) QNAME(SYSZVVDS) > > >My current statements are: > > RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(SYSZVVDS) > RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(SYSVTOC) > >I know from the Planning for GRS manual a CON: RESERVE requests should >result in only a global ENQ or a hardware reserve and a local (SYSTEM) ENQ. > >And an EXCL should: Convert a SYSTEMS to SYSTEM request > >Can anyone provide some insight as to what my impacts might be in making >this change? The vendor is going to be doing data set moves on my live >systems which will also be running a normal workload. > >Will this cause reserves to cause me a problem at the volume level? My >concern is we are running with EXCL and they need us to run CON on VTOC and >VVDS. I would like to try and understand any impacts this type of change >could have. > > #1 ... you need to treat them both the same (either convert both or don't convert both). Is this for LDMF? Are you GRS ring or STAR? If STAR, then you can change them. If RING, it depends on how many systems there are and there could be an performance impact. I don't convert them in my MIMplex but was requested to for LDMF. In looking at all the QNAMES being managed and not managed by MIM with a "DISPLAY COUNTS" command, SYSZVVDS alone has twice as many requests as the next largest requester which is SYSIGGV2. SYSVTOC is about 1/8 that. So if I managed them with MIM (MII) I know there would be some CPU impact, but that doesn't scare me as much as any possible performance impact. If I need to convert them to support LDMF for a DASD migration we are planning, I will probably dynamically add those QNAMES to MIM to manage for a night during batch, monitor and turn them off again in the morning. I suspect the biggest impact will be during batch anyway and at night there are spare CPU cycles so the CPU aspect of making the change doesn't concern me. BTW, I have 8 systems in my MIIplex spanning to sysplexes and they are using FCTC communication. 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
