From: Brian Downing <bdowning@wolfram.com>
To: "Ian K. Erickson" <ian@ns0.ipeg.com>
Cc: linuxppc-user@lists.linuxppc.org, linuxppc-dev@lists.linuxppc.org
Subject: Re: 15 partitions max prob revisited
Date: Tue, 19 Jan 1999 16:07:52 -0600 [thread overview]
Message-ID: <199901192207.QAA08969@wolfram.com> (raw)
In-Reply-To: <Pine.LNX.3.96.990119114919.10611D-100000@ns1.ipeg.com>
On Tue, 19 Jan 1999 11:51:15 -0800 (PST), "Ian K. Erickson" writes:
> On Tue, 19 Jan 1999, Brad Boyer wrote:
> > No, this is a Linux problem. You cannot have more than 15 partitions
> > on a drive because there are not device numbers allocated for anything
> > higher than partition number 15.
>
> Not that know anything about it, but out of curiosity: couldn't you use
> mknod to create >15 [hs]da's? Or could you recompile the kernal to allow
> them?
No. It works like this:
brw-rw---- 1 root wheel 8, 0 Sep 12 1994 /dev/sda
brw-rw---- 1 root wheel 8, 1 Sep 12 1994 /dev/sda1
brw-rw---- 1 root wheel 8, 2 Sep 12 1994 /dev/sda2
...
brw-rw---- 1 root wheel 8, 14 Sep 12 1994 /dev/sda14
brw-rw---- 1 root wheel 8, 15 Sep 12 1994 /dev/sda15
...so partition 16 would be major 8 minor 16, except:
brw-rw---- 1 root wheel 8, 16 Sep 12 1994 /dev/sdb
brw-rw---- 1 root wheel 8, 17 Sep 12 1994 /dev/sdb1
brw-rw---- 1 root wheel 8, 18 Sep 12 1994 /dev/sdb2
If we had more device nodes to play with, we could have devices that
work per SCSI id instead of the dynamically allocated ones we have now.
It's a huge pain when you remove a disk on a server and sdf-sdk fall
down to sde-sdj. Or worse -- when a faulty disk falls off the chain,
and when the (unsupervised) machine reboots -- everything is mounted in
the wrong place! :-)
-bcd
--
** Brian Downing
** UNIX Systems Administrator
** bdowning@wolfram.com
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next prev parent reply other threads:[~1999-01-19 22:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-19 15:00 15 partitions max prob revisited Keith Jacob
1999-01-19 10:33 ` Brad Boyer
1999-01-19 19:51 ` Ian K. Erickson
1999-01-19 22:07 ` Brian Downing [this message]
1999-01-20 3:43 ` Paul Mackerras
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