[Info-vax] HZS70 Unit number question

[Richard B. Gilbert]

Jeffrey H. Coffield wrote:
> 
> Michael Austin wrote:
>> Jeffrey H. Coffield wrote:
>>> 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
>>
>> SCSI or SAN/Fiber?  I know the HSG80 allowed devices to be configured to
>> only be able to see certain servers - aka "selective presentation". This
>> allows you to have any number of physical devices that can only be seen
>> by the system as presented by the controller.
> 
> The HSZ70 I have is SCSI. Don't know if they made a fiber version. 
<snip>
I believe that the fiber versions were designated HSGxx.