Sorry list! Now I did it! That was obviously meant for John.
I apologize! Alan -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Starr, Alan Sent: Thursday, May 27, 2010 09:17 To: IBM-MAIN@bama.ua.edu Subject: Re: Calculating the pipe size for DASD mirroring Thanks John John, I hadn't realized that you actually consult for IntelliMagic these days. Dank je wel for your help and for putting Brent on to me. This list is helpful at times but I do wish that some respondents would read the question more carefully and remain closer to the topic when they reply. (o; Life here at CalPERS is BORING! I had to come back to the USA because my parents were ill. Now that they're gone, I'm feeling like it's time for me to move on. I'm tired of living apart from Paulo for half the year because he can't get a visa to remain here with me. We're legally married in California, for God's sake! Grumble... grumble... whine... moan... (o; LOL! How's the job market in Europe these days? I was glad to hear that all is well with the family. Your news regarding your gaggle of boys reminded me of how much time has passed. A -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of John Ticic Sent: Thursday, May 27, 2010 00:28 To: IBM-MAIN@bama.ua.edu Subject: Re: Calculating the pipe size for DASD mirroring >If you want a complete independent source with top notch tools and >expertise go to the one many of the storage companies do Intellimagic. > >http://www.intellimagic.net/en/product.phtml?p=Copy%20Services > >We license some of their tooling directly now and have had good >experience with the tools and the available expertise. > >Getting this wrong is can be very painful and upset your cost model >for a proposal so IMHO it is worthwhile to engage with en expert >either allied with your storage vendor of choice or independent. > > >>> >Out of curiosity, how do they stack up against Dr H Pat and his pals over >at _www.perfassoc.com_ (http://www.perfassoc.com) ? > Dr. Pat Artis (www.perfassoc.com) and Dr. Gilbert Houtekamer (www.intellimagic.net) wrote the book titled 'MVS I/O Subsystems: Configuration Management and Performance Analysis' together. Alan, you've already had some good answers and there is a wealth of information available in RMF that can help you calculate throughput. Two of the easiest ways (if you have the right hardware) is to look at the LINK statistics (SMF 74.8) or the FICON switch port values (74.7). Both of these records will give you the write MB/s per link or port. If you intend mirroring all write activity, you now simply have to find the largest interval (peak) and add a safety margin. There are still various link replication details (compression, etc.) but you already have a good starting point. Note: The highest I/O rate typically does not correspond to the interval with the highest throughput. For some technical reading, look at our whitepapers (http://www.intellimagic.net/en/doc.phtml?p=Whitepapers) where we go into detail on obtaining information for sizing synchronous and asynchronous replication. John (alias john.ti...@intellimagic.net) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu 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 lists...@bama.ua.edu 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
