Not sure how this works on HDS disk, but with our V2X disk, we would take a snapshot and let it sit for a day. Then, after 24 hours, run the storage utilization report which would tell you how far apart the primary and secondary volumes were. Approximate amount of data changed in 24 hours - it would be a little low since you could have the same byte changed multiple times (which could be replicated) but only reported changed once when comparing old to new. It was close enough with a little fudge factor built in to calculate the pipe size for our mirror since our replication was not always on, but a scheduled push a few times a day. Target busiest days.
Jeffrey Deaver, Engineer Systems Engineering jeffrey.dea...@securian.com 651-665-4231(v) IS - "Creating competitive advantage with technology. Providing service that excels." OSS - " Where Innovation Happens" From: "Starr, Alan" <alan_st...@calpers.ca.gov> To: IBM-MAIN@bama.ua.edu Date: 05/25/2010 05:02 PM Subject: Calculating the pipe size for DASD mirroring Sent by: IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> Hello List, I was just asked to come up with statistics that describe the rate of DASD data changed (during some yet-to-be-determined period) so that we can calculate the bandwidth required to transmit the necessary (mirrored) data. The DASD hardware is HDS. I suppose that it's not necessary to pinpoint the changes down to the dataset or volume; if I can just get a number of bytes changed per period of time per subsystem, that should do. I've just started to peruse IBM manuals and redbooks but I'm wondering if any of you could point me to helpful tools. Thanks, Alan ---------------------------------------------------------------------- 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
