From: chd_1@nktelco.net (C. H. Dickman)
Subject: [pups] Major/minor device numbers and device names for MSCP drives?
Date: Mon, 19 Jun 2006 17:53:37 -0400 [thread overview]
Message-ID: <44971CE1.105@nktelco.net> (raw)
In-Reply-To: <00a601c6934e$b1e90b50$0401010a@GIZMO>
Robert Armstrong wrote:
> Probably this is documented somewhere, but I really need a pointer
> or a brief tutorial on the major/minor device numbers for mknod() and
> the device names for MSCP drives in 2.11bsd.
>
> If I have a really simple PDP with an RQDXn and one RDxx disk, then
> the device name is conventionally /dev/ra0x and the first partition,
> ra0a is (5,0), the second, ra0b, is (5,1), etc. Pretty easy.
>
> If I have two drives on my single RQDXn, then the second hard disk
> is /dev/ra1 and ra1a is (5,8), ra1b is (5,9), etc. I guess the offset
> of 8 must be the maximum number of partitions on a drive - OK, I'm
> still with you.
>
> But what if I have a second MSCP controller? Assuming that I've
> built the kernel to handle it and modified dtab to autoconfigure it,
> that is. What are the usual names and mknod() numbers for the drives
> on the second controller?
The second controller starts at ra8a (5, 8), and ra8a must be MSCP unit 0.
> Worse, what if the MSCP controller isn't a RQDX but is a real
> UDA/QDA ? Now the drives have their own MSCP unit numbers that can be
> anything from 0 to 250 - where does this figure in?
An MSCP unit number greater than 8 cannot be accessed from 2.11BSD.
> Same question for TMSCP - what if I have more than one tape
> controller? This case is easier, though, since TMSCP controllers
> normally have only one drive associated with them.
Don't know a think about it...
> Thanks,
> Bob Armstrong
>
-chuck
prev parent reply other threads:[~2006-06-19 21:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-19 3:15 Robert Armstrong
2006-06-19 6:57 ` Jochen Kunz
2006-06-19 14:51 ` Robert Armstrong
2006-06-19 15:08 ` Johnny Billquist
2006-06-19 21:43 ` C. H. Dickman
2006-06-20 15:45 ` Robert Armstrong
2006-06-19 21:53 ` C. H. Dickman [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=44971CE1.105@nktelco.net \
--to=chd_1@nktelco.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).