On Thu, 8 Sep 2005 14:43:05 -0500, Craddock, Chris <[EMAIL PROTECTED]> wrote:
>Has anyone checked to see whether there's any practical reason (i.e. >$$$) to migrate at all? Disk is pretty cheap these days and HSM is a >notable pig in most shops, ours included. > >I question the value of spending CPU cycles shoveling bits from one cold >place to another - typically in the same array. If it were mine, I'd >leave it spinning on disk until it was so old it had cobwebs on it. Then >if I cared enough about the space, I'd shove it out to a big fat tape >vault and forget about it. YMMV. > Exactly! I'm sure it does depend on the shop's ML1 rules, but most of the shops I've been at (including this one) migrate way to aggressivly to ML1. After a normal weekend or after a 3 day weekend like we just had you wouldn't believe how much [EMAIL PROTECTED] gets recalled. Monday mornings are a nightmare for ML2 tape recalls too (which doesn't make a lot of sense to me - except that some of the ML1 to ML2 rules might be in multiples of 7 days). I've had this discussion many times with storage admins. Perhaps this is mostly "history" and the problem with changing all that ML1 data to real DASD is getting / justifying the "extra" DASD. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America and Farmers Insurance Group mailto: [EMAIL PROTECTED] Systems Programming expert at http://Search390.com/ateExperts/ 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
