Sorry, I should've said z13. Martin Packer, zChampion, Principal Systems Investigator, Worldwide Cloud & Systems Performance, IBM
+44-7802-245-584 email: [email protected] Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker Podcast Series (With Marna Walle): https://developer.ibm.com/tv/mpt/ or https://itunes.apple.com/gb/podcast/mainframe-performance-topics/id1127943573?mt=2 From: Martin Packer <[email protected]> To: [email protected] Date: 26/10/2017 09:33 Subject: Re: z14 FICON and (old) Brocade switch Sent by: IBM Mainframe Discussion List <[email protected]> I had a customer recently with old switches between z14 and DS8870. Both ends were rated higher than the switches and demonstrably - from 74-8 - the links had been negotiated down. That might or might not matter to you. Long ago I had a situation where customer was running PPRC at high speed across town over low-speed fabric. That caused errors and, IIRC, outages. That probably DOES matter to you. But, as always, finance might override that. Martin Packer, zChampion, Principal Systems Investigator, Worldwide Cloud & Systems Performance, IBM +44-7802-245-584 email: [email protected] Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker Podcast Series (With Marna Walle): https://developer.ibm.com/tv/mpt/ or https://urldefense.proofpoint.com/v2/url?u=https-3A__itunes.apple.com_gb_podcast_mainframe-2Dperformance-2Dtopics_id1127943573-3Fmt-3D2&d=DwIFBA&c=jf_iaSHvJObTbx-siA1ZOg&r=BsPGKdq7-Vl8MW2-WOWZjlZ0NwmcFSpQCLphNznBSDQ&m=76hc8NkIHhBlfUtAsX7AWtLrx3hr-uYlnBVSsN-WpEk&s=GrcAXo-2p9yQyKBKvdryd3Zki5P690Dv8WbJnYEJkBw&e= From: "Alan(GMAIL)Watthey" <[email protected]> To: [email protected] Date: 26/10/2017 09:27 Subject: Re: z14 FICON and (old) Brocade switch Sent by: IBM Mainframe Discussion List <[email protected]> What are they gossipping about? Certainly the new Multihop feature won't work on old SAN Switches. That's where you have three switches in the path. Ficon has only supported either a single hop or one hop (cascading) up until now. Also, old switches might not support dynamic routing. Old switches may only support static switching (port routing on really old switches and the slightly better device routing on less old switches). Old switches won't support 16Gbps either so they'll negotiate down to 8 or lower. That'll depend upon fibre type and distance as well. -----Original Message----- From: R.S. [mailto:[email protected]] Sent: 25 October 2017 2:38 pm Subject: z14 FICON and (old) Brocade switch I heard some gossips about z14 with new FICON Express16S+ and old FICON switches. Is it real issue or just FUD to sell new SAN devices? I have some 5100 switches (8Gbps) and I don't like to replace it just because it "wasn't certified". 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