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Date:      Thu, 20 Sep 2001 16:46:39 +0200 (SAST)
From:      Khetan Gajjar <khetan@za.uu.net>
To:        <questions@freebsd.org>
Subject:   HPT370 RAID recovery
Message-ID:  <20010920164124.K27356-100000@bofh.fw.uunet.co.za>

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Hi.

FreeBSD Version: 4.4-RC
FreeBSD Vintage: 5 Sep 2001
Hardware query : HPT370-based RAID controller

I installed FreeBSD on a system where the the drives attached
to the RAID controller are configured in a mirror. The system
installs, boots and operates correctly, but when I tested a disk
failure by removing power to a disk, the system appears to hang,
and complains about ar0 losing a subdisk.

I then rebooted the machine, and the system panics, because
it is unable to mount root on ar0s1a. This sounds like broken
behaviour. Is the only way to carry on using the system by
adding in an additional disk, rebuilding the RAID and then
carrying on as normal ?

dmesg shows:

atapci0: <HighPoint HPT370 ATA100 controller> port 0xd800-0xd8ff,0xdfe0-0xdfe3,0xdfa8-0xdfaf,0xdfe4-0xdfe7,0xdff0-0xd
ff7 irq 9 at device 9.0 on pci1
ar0: 29319MB <ATA RAID1 array> [3737/255/63] subdisks:
  ad4: 29319MB <FUJITSU MPG3307AH E> [59570/16/63] at ata2-master UDMA100
  ad6: 29319MB <FUJITSU MPG3307AH E> [59570/16/63] at ata3-master UDMA100
Mounting root from ufs:/dev/ar0s1a

Khetan Gajjar.
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