[Info-vax] HZS70 Unit number question

[Jeffrey H. Coffield]

bill.hall at nav-international.com wrote:
> On Apr 24, 12:07 pm, "Jeffrey H. Coffield"
> <jeff... at digitalsynergyinc.com> wrote:
>> I have two Alphas (not clustered) connected to a HSZ70 that currently
>> has units D0 through D5 showing as DKC0 through DKC5. DKC0 through DCK4
>> are mounted on one system and DKC5 is mounted on the other.
>>
>> I have added some disks and want to add some new units but am concerned
>> about the SCSI disk numbering and the unit numbering. AFAIK the SCSI
>> controller takes a unit number (usually 7) so you could only have DKA0
>> through DKA6 on a bus.
>>
>> I have read the CLI reference manual on the HSZ70 and can't see any
>> mention of there being a conflict between the unit number and the SCSI
>> addressing. It does say that a controller can present up to 8 units on
>> each target ID number. Both controllers show a SCSI target(s) of (0).
>>
>> I only want to add two more units which would be DKC6 and DKC7 although
>> what the actual disk unit is is not important.
>>
>> Jeff Coffield
> 
> Jeff,
> 
> As you have your HSZ70 configured, you can "add unit" D0 through D7.
> You can add additional target addresses to your controllers that will
> allow more units (and do some load balancing if you have redundant
> controllers).
> 
> set this_controller id=(0,1,2,3)  ! up to 8 target id's, but must be
> unique on the host scsi bus, hosts are usually 6 and 7
> 
> This command will allow the controllers to present unit numbers 0-7,
> 100-107,200-207, and 300-307.
> 
> Bill

AHA, a CFL (green for lightbulb) comes on!.

DKA0 is really DKA000 and is SCSI id 0, SCSI id 1 is DKA100 so SCSI id 7
would be DKA700, not DKA7.

Thanks to you and the others who replied so quickly.
Jeff