  Problem Configuring New SCSI Device? 
 The Question is:
 
I have added a digital dat drive TLZ-09 in a storage works ssb.  the disk
array contains the system disk dka0:
The system disk is on the internal scsi controller with cables to the ssb
unit.
 
I plugged in the tape drive on auto recogintion (default settings) I was
expecting the drive to auto-detect.
 
All disks are mounted in a cluster with $n$ defining the node number.  I
have a dlt tape drive in another node as MKB500:
 
It didn't????  any idea's
 
 
 The Answer is:
  In order for OpenVMS to recognize a new device without rebooting, you must
  run the autoconfigure procedure.  For OpenVMS Alpha, do this from a privileged
  account:
 
	$ run sys$system:sysman
 	SYSMAN&gt; io autoconfigure
	SYSMAN&gt; exit
 
  From OpenVMS VAX, do this from a privileged account:
 
	$ run sys$system:sysgen
	SYSGEN&gt; autoconfigure all
 
 
  Allocation classes for tape devices are set using the TAPE_ALLOCLASS system
  parameter.  The ALLOCLASS system parameter applies only to disk devices.
  You set these parameters using the SYSGEN utility.
 
  If you have done the above, or have rebooted, and the device is still not
  recognized, it is possible that the SCSI bus   is too long, that the SCSI bus
  is improperly terminated, that there is a SCSI ID unit number collision (with
  another SCSI widget or with the host controller(s) connected to the SCSI bus),
  or that there is a hardware problem with the SCSI device.
 
  Without additional system configuration information (which Alpha host,
  SCSI controller, multihost details, etc) it is not possible to say if
  there is a specific need for the use of allocation classes in this
  particular configuration -- the allocation classes are the "n" in the
  $n$ prefix.  The allocation class prefix is typically only required
  when one or more multipath storage devices exists in the configuration,
  or when there is a need to differentiate two (or more) storage devices
  with identical unit numbers.   With OpenVMS releases V7.1 later (V7.1-2
  and later prefered), port allocation class support is available.
 
  Multihost SCSI configurations do not permit the configuration of tape
  or other "non-reentrant" devices on the shared SCSI bus.  This
  configuration restriction is due to the results of the expected SCSI
  resets that can occur -- tape devices will rewind and reposition as
  expected as a result of a SCSI reset, triggering adverse effects on
  the host software accessing the tape device.
 
  Please contact your hardware support organization or Compaq Customer
  Services for assistance in configuring and troubleshooting the SCSI.
