The total number of paths must be kept at 256 or less. With 2 cascading directors: (LPAR <-> CNTRL1) * (CNTRL1 <-> CNTRL2) * (CNTRL2 -> DASD). 4 * 8 * 8 would be 256. With a single director 16 * 16 is possible but not usually needed.
On Tue, Dec 31, 2013 at 8:26 AM, Dazzo, Matt <mda...@pch.com> wrote: > We have a new IBM DS8870 that I have to define to the IODF. We are going to > have (16) 2107 type LCU's controllers and about 3k total devices defined to > those 16 LCU's. We also have 16 FICON channels available to use, I was > thinking about defining 8 channels to each LCU. > > We currently have 4 channels defined to each LCU on our existing Shark > device. We do not experience any IO delays or contention with this config. > > My experience in this area as you can tell is a little limited. As far as > channels are concerned is the motto 'the more the merrier' apply here? Or > should I follow the existing standard of 4 channels to each LCU? Any > standard to follow? > > Thanks Matt > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
