On Mon, 14 May 2007 16:26:48 +0200, R.S. <[EMAIL PROTECTED]> wrote: >Well, it's safe, convenient, error-proof, but EXPENSIVE.
Yes... it has a cost. As I said, the cost of duplexing test data is probably a nit. For production, yes we are duplexing things that *may* not be needed for DR (but who really knows... and I hope we never find out). The landscape has changed over the years so perhaps we will re-visit this again some day. But just because DASD is mirrored doesn't mean a (virtual) tape data set isn't needed as input from a previous day's, week's or month's run of some application. But the other benefit (and part of the reasoning behind it and getting approval for the $$$) is the size of these back end volumes (MVCs for those of you speaketh VSM). If one of those puppies gets destroyed or is unreadable... that's a lot of data (typically hundreds of virtual volumes) on a single tape. And we've had our share of bad media issues. So at that point the extra cost (beyond in-house recovery) is shipping the duplex MVCs off site and storing them, Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group: G-ITO mailto:[EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- 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
