On Mon, 3 Apr 2006 22:50:45 -0400, Bruce Black <[EMAIL PROTECTED]> wrote:
>I'm having trouble understanding exactly what you are asking. >By USP I assume you mean an Hitachi USP. MP Reply: Yes, HDS TagmaStor or USP is what I am using. >As I understand it, the USP >can have its own disks internally and can also front-end other control >units. It can emulate 3990 and 2105. > >Do you mean having two logical CUs in the USP, one 2105 one 3990, >accesing the same disk? MP Reply: Yes - this is what I mean. We see it happening like this: a) It is a predefined control unit whether it be nn (00-1F) for ficon or 00-0F for escon (hard wired) b) device type is still 3990 c) dasd subsystem knows device as 3390 d) Each cpu would have its own way of connecting to the disk subsystem.. whether it be via escon or ficon..so long as it uses only one access method. >Or do you mean an external disk, accessed through the USP, and you also >want to attach a 3990 to those same disks? I suppose it depends on the >kind of disks. > >If you want an external 3990 to access the internal USP disks, no way > >-- >Bruce Black >Senior Software Developer >Innovation Data Processing > >---------------------------------------------------------------------- >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 ---------------------------------------------------------------------- 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
