  Disk Multipath Information? 
 The Question is:
 
Hi Wizard,
 
I would like to know if there is any way (supported or unsupported) to extract
 information related to multi-pathing for disks using the f$getdvi lexical
 function.
 
In particular I would like to find out the current path, the primary path and
 the number of available paths to an HSG80 controlled disk.
 
If this is not possible, are there any plans to extend the functionality of
 this lexical function to extract this type of information?
 
Thanks and Regards
 
Edwin
 
 The Answer is :
 
  What is available and supported is included in the help text and
  the documentation for the particular OpenVMS release involved.
 
  The $getdvi system service itemcodes of interest include:
 
    DVI$_ALT_HOST_AVAIL
    DVI$_ALT_HOST_NAME
    DVI$_FC_NODE_NAME
    DVI$_FC_PORT_NAME
    DVI$_HOST_AVAIL
    DVI$_HOST_NAME
    DVI$_WWID
 
  The list of available paths is accessable via the OpenVMS system
  service $device_path_scan.  There is presently no DCL lexical
  function that is equivelent to this system service call.
 
  You can trivially create an image which calls this service, and
  returns values via DCL symbols -- this approach has the advantage
  of being entirely supported and (unlike parsing DCL command output)
  will not tend to fail if/when the output format of the DCL command
  is altered.
 
 Answer written or last revised on  5-SEP-2001 
