HP OpenVMS Systems

ask the wizard
Content starts here

MOUNT, Labels, Logicals, and Device Naming?

» close window

The Question is:

Am I doing something wrong or using the wrong commands? I can get the last 2
 drives to mount but not the other 4. I'm stumped.

The Answer is :

  Some of your disk devices apparently have a volume label that mimics
  the semantics of an OpenVMS physical disk device name, and some do not.
  Use the following command to MOUNT an arbitary disk device "ddcu:" and
  determine its volume label:
  Once you know the volume label, add the command to the system startup
  SYSTARTUP_VMS.COM or -- if this is a cluster -- consider creating and
  using a locally-customized version of SYS$EXAMPLE:MSCPMOUNT.COM.
  If you wish, you can use the following command to change the volume
    $ SET VOLUME/LABEL=label ddcu:
  The typical MOUNT command is as follows:
    $ MOUNT ddcu: volume-label [logical-name]
  You could then use th logical name explicitly specified on the MOUNT
  command (if any) or the MOUNT-created DISK$volume-label logical name
  (see below) to create any additional logical names that are required.
  For instance:
    $ DEFINE/SYSTEM/EXECUTIVE new-logical-name DISK$volume-label
  When you mount a disk device on any recent OpenVMS version, the OpenVMS
  MOUNT command will transparently create both the logical name specified
  by the logical name parameter on the MOUNT command (if specified) and a
  volume logical name that is created by appending the volume label onto
  the string DISK$.   (In the case of your volume with the volume label
  DKB0, the logical name generated by MOUNT would be DISK$DKB0.)  For
  more and more specific information on MOUNT, please see HELP MOUNT or
  the MOUNT documentation in the OpenVMS documentation set.
  The OpenVMS Wizard would encourage using volume labels which related
  to the contents of the disk and that do not -- and this approach is
  solely to help reduce the confusion, there is no technical prohibition
  against this usage -- mimic the OpenVMS physical device naming.
  The OpenVMS Wizard prefers to use the DEFINE command, as the parameters
  on this command -- unlike the ASSIGN command -- follow the "from to"
  order found on most other OpenVMS commands.  (ASSIGN follows the older
  RSX-derived parameter ordering; the "to from" parameter ordering.)  This
  consistency can help reduce some of the confusion with parameter ordering,
  particularly when using parameters -- such as using device labels that
  closely parallel device names -- that are already somewhat confusing.
  Both the DEFINE and the ASSIGN commands are fully supported.
  When referencing devices, the OpenVMS Wizard would encourage using
  the DISK$label logical names and not the physical device names.
  This makes the effort involved in reorgnizing or in upgrading the disk
  storage far simpler.

answer written or last revised on ( 16-SEP-2002 )

» close window