From: arne@vajhoej.dk   
      
   On 12/17/2025 5:52 PM, flexmcmurphy wrote:   
   > Setup (simplified):   
   > - SIMH VAX (have tried MicroVAX 3900 and VAX 8600)   
   > - OpenVMS VAX 5.5-2H4 ISO attached as an RQ device (read-only)   
   > - Booting directly from the ISO into standalone BACKUP   
   >   
   > In standalone BACKUP, the installation media always appears as DJAx   
   > (device type RA60), not as DUAx, for example:   
   >   
   > Available device DJA3: device type RA60   
   >   
   > As a result, restoring the saveset only works using:   
   >   
   > BACKUP DJA3:VMS2H4055.B/SAVE_SET DUA0:   
   >   
   > However, I have seen multiple reports (e.g. WinWorldPC forum, blog tutorials)   
   > where users claim to restore from the *same* OpenVMS 5.5-2H4 ISO using:   
   >   
   > BACKUP DUAx:VMS2H4055.B/SAVE_SET DUA0:   
      
   > 1) Under standalone BACKUP 5.5-2H4, what determines whether the boot   
   > device is assigned DUAx vs DJAx?   
   > 2) Is this affected by the VAX model (MicroVAX vs 8600/8650), SIMH MSCP   
   > configuration, or whether BACKUP was booted from that device?   
   > 3) Is DJAx actually the expected and correct name for RA60-based ISO   
   > media in this environment?   
   > 4) Using my setup is it at all possible for me to restore the save_set with   
   a command such as:   
   > $ backup dua3:VMS2H4055.b/save_set dua0:   
   > instead of   
   > $ backup dja3:VMS2H4055.b/save_set dua0:   
   >   
   > Any clarification would be greatly appreciated.   
      
   Traditional VMS disk device naming is:   
      
   D = disk   
   X = controller type, U=Unibus, I=DSSI, K=SCSI   
   Y = controller number, A=first, B=second, C=third ...   
   N = unit on controller, either 0=first, 1=second, 2=third ... or   
   0=first, 100=second, 200=third   
      
   RA81's and RA82's become DU disks.   
      
   Google indicate that RA60's become DJ disk. Not sure why. I am not old   
   enough to know RA60's. Maybe someone else can elaborate on why RA60's   
   are DJ and not DU.   
      
   Arne   
      
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