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Date:      Tue, 08 May 2001 01:08:48 +0200
From:      alex <ml-freebsd-hardware@phobgate.de>
To:        freebsd-hardware@freebsd.org
Subject:   Gigabyte GA-7ZXR with onboard Promise IDE RAID 0+1 Controller - booting FreeBSD-4.2 from mirrored Array
Message-ID:  <1441650205.989284128@[192.168.2.94]>

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hi there,

I have a Gigabyte GA-7ZXR with the onboard Promise IDE ATA100 RAID 
Controller (supports RAID 0 and 1, single / mixed). I installed FreeBSD 4.2 
release on a RAID 1 (mirroring) and rebooted. No problems so far. But when 
I power off and remove one disk, FreeBSD stops while booting missing 
/dev/ar0 (I installed on /dev/ar0s1a, b, e, f -> RAID Array) with the 
following message:

can't stat /dev/ar0s1a: No such file or directory

any ideas?

On the other side, while installing / partitioning the disk I had /dev/ad4 
and /dev/ad6 as options too for partitioning, not only /dev/ar0 ...?? This 
makes me wondering, does FreeBSD see them as an Array and additionally as 2 
single disks?
When i think about this, does FreeBSD recongnise a broken Array as a 
'standalone disk' (no array, just the disk itself) instead 'this disk is 
part of array which is just not complete'..? when using mirroring, this 
shouldn't be handled this way, i think. in my opinion mirroring means, the 
still systems runs, even with only one disk. or am i wrong?
maybe at the time 4.2 was released, there was no support for booting a 
broken mirrored array. if it's now, then please tell and forgive me :)
I was looking for documentation for this Promise Controller under FreeBSD 
but didn't find something usefull about support of Arrays under FreeBSD 
(stripe / mirror), that's why i ask you.

hope you can help me, thanks in advance.
if you need more informations, tell me.

alex


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