As they say on the radio... "Long time listener, first time caller",
     or in this case "Writer".

     I'm looking at ways to increase protection on my disk "Farm" in case
     of a disk-crash. Currently on a HP3000/957SX, I have about 18GB, on 10
     drives, in 1 volume-set. Of the 18GB, about 13GB is used (28% free
     space), of the 13GB, only 3.5GB is user data. The rest is source-code,
     executables, etc., and 2 copies of the user data. All of the user data
     is in Image databases (ASK/MANMAN System)

     My primary concern is losing user data that has been entered during
     the day, before the nightly back-up. We are a manufacturing facility,
     so although downtime is a concern, the loss of data is most critical.

     One given is to set up User Volume Sets (SYSTEM, PRODUCTION, TEST).

     I'm looking for some feedback from the list about any concerns or
     problems in using Mirrored Disk. With adding 4 more disk drives, I can
     set up the following configuration:

        System:         2 drives
        Production:     4 drives
        Prod Mirrored:  4 drives
        Test & other    4 drives

     My concern is the possibility of an I/O bottleneck by bringing the
     production data down to 4 drives, when it used to be spread over 10.

     Thanks in advance for any responses to the above.


     Bob Mueller                        [log in to unmask]
     M.I.S. Manager                     Phone: 201-967-3680
     Datascope Corp. - PM Division      Fax: 201-265-1867