2.11BSD Device Names

Ethan Dicks ethan.dicks at gmail.com
Thu Sep 15 15:13:52 CDT 2016

On Thu, Sep 15, 2016 at 4:08 PM, David Coolbear <david at thecoolbears.org> wrote:
> For 2.11BSD on the PDP-11, in the stand alone utilities that are found on
> the installation tape, the storage devices are named:
> dn(x,y,z) where dn is the mnemonic for the driver, x is the controller
> number, y is the unit number and z is the partition on the unit. So the
> first partition on the first drive on the first MSCP controller is
> ra(0,0,0). It's fairly easy form the install tape to disklabel and mkfs a
> drive on a second controller.

Sure... driver name, then a vector of controller, unit, and partition...

> Once UNIX is running, things change. The devices in /dev are named ra0 for
> the first unit on the first controller, ra1 for the second unit on the
> first controller and etc. I don't see a way in the naming convention to
> identify other controllers.
> My question is, what is the device name in /dev for the first drive on the
> second controller?

Isn't it rb?


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