HP OpenVMS Systems

SCSI Hardware questions?

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The Question is:

 
This is more of a hardware related question.  I have multiple versions of
OpenVMS(6.2-1H3, 7.1-1H2, 7.1-2) with different Scsi disks.
With the new different scsi configurations what are the maximum distances
for the different scsi busses?
I know that SCSI slow was 4M ans SCSI Fast was 3.  What about Ultrascsi,
fast wide scsi, etc.
 

The Answer is :

 
  Information on the maximum permitted length of a SCSI bus is inherently
  rather dangerous information, as a shorter SCSI bus is always a better
  choice over a longer SCSI bus.
 
  The permitted length of the SCSI bus is not dependent on the OpenVMS
  version.
 
  For specific information on the maximum SCSI bus length supported,
  check the particular SCSI controller documentation or (for integrated
  SCSI controllers) the system documentation, or contact the customer
  support center for assistance.
 
  The maximum UltraSCSI domain is 74 meters.  There exists at least a
  page of rules, and of conversions of SCSI widgets into meters.
 
  The maximum SCSI bus (using DWZZA/DWZZB) is 53 meters.  Like the
  UltraSCSI requirements, there exists at least a page of rules, and
  of conversions of SCSI widgets into meters.
 
  A more appropriate Wizard would be the one lurking over at:
 
    http://www.storage.digital.com/
 

  

     

     
answer written or last revised on ( 8-FEB-1999 )
     
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