"Mark Zelden" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > On Wed, 19 Dec 2007 16:30:09 +0100, Vernooy, C.P. - SPLXM > <[EMAIL PROTECTED]> wrote: > > >"Mark Zelden" <[EMAIL PROTECTED]> wrote in message > >news:<[EMAIL PROTECTED]>... > >> On Wed, 19 Dec 2007 09:17:20 -0500, Mark Jacobs > ><[EMAIL PROTECTED]> > >> wrote: > >> > >> >Is there any advantage in migrating CTC's from ESCON to FICON? > >> > > >> > >> Of course. But I guess it could depend on the application. We saw > >much > >> better response times with MIM, VTAM and XCF CTCs when we migrated > >> to FICON. Of course now the CF links are faster (again) than using > >CTCs > >> so the XCF part wouldn't matter as much. > > > >Yes, it does, because of the protocol. With the CTC protocol a message > >is sent directly from the sender to the receiver. Via the CF structure, > >a message is put in the Structure, the CF notifies the receiver that > >there is a message and the receiver then retrieves the message. > > > >I just converted our testsysplex to CTC signalling paths and noted a 20 > >times performance inprovement. This is of course due to the shared CF > >engines, that perform relatively badly. However if I compare these CTC > >figures to our Production CF Structure figures I still expect an > >improvement there by a factor 2. > > > > Yes - of course with a shared CF engine. But with current hardware (link > technology, z9 engines) the links are once again faster. YMMV. > > Mark
I was at a Parallel Sysplex and Performance training earlier this month and the teacher told us, that CTCs ourperform CF signalling paths, because of the multiple step (write, notify, read) approach for the CF path versus the single step (what is written is synchronously read at the other side) approach for the CTC path. And as I said: if the CTCs for our production sysplex are going to perform as they do now in our testsysplex, and I so no reason why not, then they will double the XCF signalling performance. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
