Mark, I converted SYSVTOC, SYSVVDS and SYSIGGV2 on a three way MAS back when we were still on parallel channels. The MIM file was on 3880-23 and really loved that cache, but the benefits were substantial, especially during the batch run hardware reserves on VTOCs and catalogs were a major pain. Converting SYSIGGV2 was to solve some soft embrace issues we were hitting.
Did the same thing on a two way MAS a few years later at two sites that also had a lot of the same contention. One with GRS and the other with MIM using the Turbo option. This was on ESCON and the benefits were noticeable but not as substantial. I would think that converting these three Reserves would be one of the first things you do if you go MIM or GRS, Star or ring. While they are very high in the overall count of reserves, the rate is actually quite low. 1,000,000 reserves in day is only 11 per second. I would think twice before doing this beyond three systems in a GRS ring though. Ron > > #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. > ---------------------------------------------------------------------- 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
