22 Mar
2007
22 Mar
'07
7:35 p.m.
On Thu, 22 Mar 2007, David Betz wrote:
I have a MicroVAX II that is able to boot into Ultrix
4.3 single user mode.
If I type "mount" it says that /dev/ra0a is mounted on /. I assume that is my
ESDI hard drive since the drives plugged into my SDC-RQD11-EC ESDI controller
are the only ones plugged into my system. So, my question is, what would the
second drive on that controller be called? Would it be /dev/ra0b or
/dev/ra1a? In other words, what do the "0" and "a" parts of the
device name
mean? Is "0" the controller and "a" the device on that controller?
0 is the drive and a is the partition.
However, bear in mind that (this being Unix) the *real* magic is done in
the directory entry. If you take a close look, you'll see that /dev/ra0a
is a block special device with two parts: the device number (index into
the devsw[] array) and unit number. You can create a special file with
*any* name that maps to the same device as /dev/ra0a.
--
roger ivie
rivie at ridgenet.net