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From: Pascal Hambourg on 5 May 2010 06:22
Hello,

Robert Heller a �crit :
>
> I presume it is just a mirror set.

The RAID array, type, status and partitions can be checked with :

cat /proc/mdstat

> Just boot up Linux and use mdadm to remove the second disk:
>
> # assumung disk 2 is /dev/hdb (which would actually be bad for RAID over
> # IDE) and 'slice 6' == partition #6:
>
> # fail it
> mdadm -f /dev/md0 /dev/hdb6
> # then remove it
> mdadm -r /dev/md0 /dev/hdb6
>
> /dev/md0 is now a mirror set with only one disk (not real meaningful,
> but so what).
>
> I *think* you can just change the parition type to plain Linux (83) and
> mount it as ext2.

IIUC, the OP wants the removed RAID partition to be a FAT32 partition,
not a Linux ext2 partition. Anyway I would not touch the remaining
active RAID 1 partition, as it works as is and would require other
changes such as in the boot loader and fstab.
From: Pascal Hambourg on 5 May 2010 06:27
Robbie Hatley a �crit :
>
> Alas, but mdadm seems not to exist on this machine. I get:
>
> [root(a)localhost root]# mdadm --help
> bash: mdadm: command not found

Maybe it is not installed and you have to install it. Or the
distribution is so old that it uses raidtools or raidtools2 instead. You
can check the presense of mkraid that is part of this package.

> I'm currently running AMD Athlon XP 3000 Barton Core. Not sure if that's
> equiv. to 586 or 686.

It is compatible with 686.
From: Pascal Hambourg on 5 May 2010 06:30
Robbie Hatley a �crit :
>
> It's the redundant kind. Straight redundancy, no striping.
> The idea was to provide a constant running backup of everything on
> a separate physical hard disk

Mirroring RAID does *not* provide backup. It provides availability. It
won't protect against things such as "rm -rf /" or data corruption.
From: J G Miller on 5 May 2010 07:04
On Wednesday, May 5th, 2010 at 12:27:34h +0200, Pascal Hambourg wrote:

> Maybe it is not installed and you have to install it. Or the
> distribution is so old that it uses raidtools or raidtools2 instead.

Exactly, Red Hat 9 came with a 2.4 kernel and used the old
/etc/raidtab configuration with raidtools-1.00.3-2.i386.rpm.

The custom Red Hat GUI method of setting up RAID is again
found in the RH9 documentation which I previously provided a
URL for, this time in Chapter 10 at

<http://www.redhat.COM/docs/manuals/linux/RHL-9-Manual/custom-guide/ch-software-raid.html>
From: Jean-David Beyer on 5 May 2010 08:59
Robbie Hatley wrote:

> (That's how I made the triple booting system in the first place.)
> And this "DD" you mention to copy stuff.
>
By the way, the previous poster did not mention "DD", he said "dd". In
UNIX and Linux systems, CASE MATTERS!

--
.~. Jean-David Beyer Registered Linux User 85642.
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