Hi T. Rob, Thanks for that - having never needed RQSTR or SRVR channels before this has made me realise that I don't really understand the mechanisms behind them.
I couldn't find anything about this in the Intercommunication manual - where is it all documented? I'm particularly interested in your set up using RQSTR channels instead of RCVRs. Also, with regard to the original question, it's interesting to note that the Sys Admin guide entry for the runmqchl command only specifies its use for SDR or RQSTR channels - presumably SRVR channels should be there as well. Cheers, Paul -----Original Message----- From: Wyatt, T. Rob [mailto:[EMAIL PROTECTED] Sent: 20 February 2004 17:27 To: [EMAIL PROTECTED] Subject: Re: Automatic Channel Restart Paul, "What's the difference between a fully qualified SVR channel and a SDR then?" Consider the following definitions: QMGRA def chl(sDr.to.b) chltype(sdr) conname(b) def chl(sVr.to.b) chltype(svr) conname(b) QMGRB def chl(sdr.to.b) chltype(RQSTR) conname(a) def chl(svr.to.b) chltype(RQSTR) conname(a) QMGRC def chl(sdr.to.b) chltype(RQSTR) conname(a) def chl(svr.to.b) chltype(RQSTR) conname(a) If you are on QMgr B and start the channels, you won't see any difference between them. On the other hand, if you start the channels from C, SVR.TO.B will connect to you on C while SDR.TO.B will start a channel to B. "Why would you use one?" We've found some uses for implementing failover configurations. We considered them a security risk and of limited use for quite a while, back before we had Joergen's BlockIP exit. "Also, in the RQSTR-SDR configuration, do you turn triggering off for the SDR channel's Xmitq to prevent the channel going into retry?" Not at our shop, anyway although I'm guessing some do. In all cases, we opt to let the messages flow to their final destination rather than batching them up. We just don't bother with RCVRs at all and always use RQSTRs. We've found that having RQSTRs in place helps us recover from some outages where we do not have visibility to the remote QMgr and are generally convenient to have around. We've surprised a number of our vendors and business partners by starting their SDR channels when they failed to trigger. -- T.Rob Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
