Re: 2.11BSD Device Names

[Ethan Dicks]

On Fri, Sep 16, 2016 at 2:52 PM, Glen Slick  wrote:
> On Thu, Sep 15, 2016 at 1:13 PM, Ethan Dicks  wrote:
>>> My question is, what is the device name in /dev for the first drive on the
>>> second controller?
>>
>> Isn't it rb?
>
> [ra8a - ra8h] block, major numer 5
> [rra8a - rra8h] character/raw, major number 14

I must be used to some DECism in Ultrix, then.  Wouldn't surprise me
if they did something different from real BSD (that or I'm
misremembering something else from 30 years ago).

-ethan

Re: 2.11BSD Device Names

[Glen Slick]

On Thu, Sep 15, 2016 at 1:13 PM, Ethan Dicks  wrote:
>> My question is, what is the device name in /dev for the first drive on the
>> second controller?
>
> Isn't it rb?
>
> -ethan

[ra8a - ra8h] block, major numer 5
[rra8a - rra8h] character/raw, major number 14

The low 6 bits of the minor number are the drive and partition. The
minor numbers for the drives and partitions on the second controller
are in the range 64-127.

# ls -l *ra8*
brw-r-  1 root   5,  64 Aug  1  1995 ra8a
brw-r-  1 root   5,  65 Dec 16  1991 ra8b
brw-r-  1 root   5,  66 Dec 16  1991 ra8c
brw-r-  1 root   5,  67 Dec 16  1991 ra8d
brw-r-  1 root   5,  68 Dec 16  1991 ra8e
brw-r-  1 root   5,  69 Dec 16  1991 ra8f
brw-r-  1 root   5,  70 Dec 16  1991 ra8g
brw-r-  1 root   5,  71 Dec 16  1991 ra8h
crw-r-  1 root  14,  64 Dec 31  1997 rra8a
crw-r-  1 root  14,  65 Dec 16  1991 rra8b
crw-r-  1 root  14,  66 Nov  7  1995 rra8c
crw-r-  1 root  14,  67 Dec 25  1991 rra8d
crw-r-  1 root  14,  68 Dec 25  1991 rra8e
crw-r-  1 root  14,  69 Dec 20  1991 rra8f
crw-r-  1 root  14,  70 Jan 19  1997 rra8g
crw-r-  1 root  14,  71 Dec 16  1991 rra8h

Re: 2.11BSD Device Names

[Glen Slick]

On Thu, Sep 15, 2016 at 1:08 PM, David Coolbear  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.

Re: 2.11BSD Device Names

[Ethan Dicks]

On Thu, Sep 15, 2016 at 4:08 PM, David Coolbear  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?

-ethan