On Thu, Sep 15, 2016 at 1:08 PM, David Coolbear <da...@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. > > 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?
man ra major device number(s): raw: 14 block: 5 minor device encoding: bits 0007 specify partition of RA drive bits 0070 specify RA drive bits 0300 specify RA controller ra{0-7}{a-h} would be the 8 partitions on the 8 drives on the first controller ra{8-15}{a-h} would be the 8 partitions on the 8 drives on the second controller ra{16-23}{a-h} would be the 8 partitions on the 8 drives on the third controller ra{24-31}{a-h} would be the 8 partitions on the 8 drives on the fourth controller. ls -l /dev/*ra* If you don't see the device you need than you can use /dev/MAKEDEV to create it with the appropriate major and minor device numbers.