How far apart are the two sites? Are you sending more data now than in the beginning? Are you sending this data across pure Ficon, or are you using network (like DWDM)? The first thing I would check is buffer credits on the ISL ports. If you start pushing a lot of data, if buffer credits are not high enough, you can get buffer depletion, which can cause IOS messages. In my past life, we also had a problem where one of the network switches (in the DWDM path) had a flaky SFP, which showed up intermittantly. Our network help desk looked at the switch, did not see anything, but when I got one of our network engineers to look, he found lots of errors on one of our ports. The failure rate was below the threshold to flag the port in error. When they replaced that SFP, the problem went away.
HTH Steve On Fri, 28 Jan 2011 07:25:32 -0600, Ibm Main <[email protected]> wrote: >Hi, >at our installation we ara having some conectivity problems. >We have two sites (S1 and S2), with two z10 EC (z/OS 1.11) each, connected >via FICON cascading. >When some system in S1 writes in tape or disc at S2 we get lot of IOS messages: >IOS050I CHANNEL DETECTED ERROR ON 8AB9,98,E7,**02,PCHID=0400 > >At the beginning everything worked well, but in the last weeks some JOBs are >failing. > >We have checked all fibers involved in the communication, changed FICON >SFPs, and no way to get rid of the message. > >Any ideas what can be issuing the message? > >Thanks! > >Regards, Chrstian. > >---------------------------------------------------------------------- >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 ---------------------------------------------------------------------- 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
