topic Re: Mknod command in Operating System - HP-UX

Mknod command

Kevin_107 — Mon, 21 Oct 2002 11:18:20 GMT

Sorry that should have read...When issuing the mknod command how do I determine the minor number ?!?!

Re: Mknod command

Clemens van Everdingen — Mon, 21 Oct 2002 11:21:33 GMT

Hi,

You will have to look in /dev/vgxx for example to see waht minors already exist and pick that does not exist.

C.

Re: Mknod command

Emmanuelle — Mon, 21 Oct 2002 11:25:03 GMT

ll /dev/vg*/group

Re: Mknod command

Andreas Mueller_1 — Mon, 21 Oct 2002 11:29:35 GMT

Kevin,

in order to keep somewhat of a system standard, I usually assign my minor numbers to match my VGnn, i.e vg01 would have a minor number of 00x010000, vg02=00x020000 and so on.

Andy

Re: Mknod command

Clemens van Everdingen — Mon, 21 Oct 2002 11:30:10 GMT

Hi,

correct ! I forgot the /group

C.

Re: Mknod command

Chris Fadrowski — Mon, 21 Oct 2002 18:15:09 GMT

just be careful to remember this is in hex. When you get up to lets say vg11 and higher you will need to convert this number (11). And the Letter associated with it... ie... 00x0E0000

Re: Mknod command

doug hosking — Tue, 22 Oct 2002 08:54:28 GMT

It's not clear to me from the question why previous responders assumed the question was about disks. Every device file has a major and minor number, with the minor number generally containing information about the unit number and (sometimes) operational modes for the device. These modes vary from driver to driver (such as whether a tape drive should rewind on last close, or configuration attributes for a terminal device), so it's not possible to give a totally useful answer without knowing which specific device file you're talking about, and, in some cases, which version of HP-UX you are running.

Re: Mknod command

Clemens van Everdingen — Tue, 22 Oct 2002 09:27:04 GMT

Hi,

Doug is right !
There are other possibilities.
For example a jukebox device or modem devive etc.
Bu tmost of the time the documentation about the device will guide you.

C.

Re: Mknod command

T G Manikandan — Tue, 22 Oct 2002 09:38:11 GMT

minor number's format is like so 0xxx0000 whereby xx can have the value between 00 and ff

It depends on the maxvgs parameter.
The default value of maxvgs(maximum volume groups) is 10.

Like
vg00 = 0x000000
vg01 = 0x010000

If maxvgs is more than 10,then
vg10=0x0a0000
vg15 = 0x0f0000

It is not that it should be in this order.
you can use the minor numbers if they are not used.
They should be unique.
YOu can just do a
ll /dev/vg*/group
to find out the used ones.

Thanks

Re: Mknod command

Trevor Parfitt — Tue, 22 Oct 2002 09:42:10 GMT

Volume groups do not have to begin with vg
So I use the command

find .|grep group|xargs ll|sort -k6