Date: Sun, 02 Sep 2007 09:05:20 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Modulok <modulok@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: root on gmirror and disk failure... Message-ID: <46DA6EC0.7050705@infracaninophile.co.uk> In-Reply-To: <64c038660709012014s2ce2751bl3c2618538411d220@mail.gmail.com> References: <64c038660709012014s2ce2751bl3c2618538411d220@mail.gmail.com>
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Modulok wrote:
> The provider, /dev/mirror/gm0, is not being created. This is
> significant for obvious reasons: no mirror means no provider which
> means no root. The module /boot/kernel/geom_mirror.ko is loaded, as I
> have manually loaded it via the loader(8) prompt and attempted the
> simulated failure again with identical results. It's the provider that
> isn't being created, for whatever reason.
>
> Suggestions? (Other than purchasing a hardware RAID card).
I've seen these symptoms before. It appears to be a "feature" of
certain Motherboards. If you're lucky there will be some BIOS
options you can toggle to make it behave better -- usually to do
will telling the motherboard *not* to do any sort of RAID stuff itself.
Otherwise, look for BIOS updates, or switch to a different
Motherboard. Systems supplied with hot swap drives (meaning SATA
rather than IDE) tend to work better. Or install a hardware RAID
controller.
I've also a feeling that there's a behavioural difference between
'only one drive present' and 'one working drive and a blank disk'
but haven't really tested that theory out, as we solved the original
problem by other means.
Cheers,
Matthew
- --
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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