My original question follows:
>I've read most of the archived material from this list, but
>haven't found the answer to my question. I'm adding a Seagate
>ST15230N disk as an external drive on an Alpha 3000/400 running
>OSF 3.0. I've made the physical connections. The drive shows
>up at scsi1.
>
>My question concerns the syntax in the config file to add the
>device definition of the new disk. At present the config file
>has the following two lines for disk devices:
>
>device disk rz3 at scsi0 drive 24
>device disk rz4 at scsi0 drive 32
>
>What does the number 24 represent after drive? Where does that
>come from?
>
>I'm planning on adding the line for the external drive after the
>line for the scsi1 controller. It would look like this:
>
>device disk rz6 at scsi1 drive ?
>
>What do I put in place of the question mark? I have been through
>the man pages and the manuals. Any help would be greatly
>appreciated.
>
>Kathy
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
My thanks to the many wonderful people who answered!
Selden E Ball Jr helped me to understand it best with the following
explanation:
The number in the last column represents the additional
offsets for LUNs. The SCSI standard provides for each
device to recognize 8 logical units at each SCSI ID.
Most disks are set to recognize LUN 0, so you need to specify
the appropriate multiple of 8 as the LUN offset in that
column. Device 0 on SCSI bus 0 is at lun offset 0.
Device 0 on scsi bus 1 is at lun offset 64.
So, I took Selden's (and others) advice to boot genvmunix and use
the "doconfig" command with no argument. It created a new system-
specific configuration file and all of the appropriate /dev files.
For the record, the line the system added in the config file was:
device disk rz9 at scsi1 drive 72
Thanks again,
Kathy
Received on Tue Oct 10 1995 - 19:28:18 NZDT