Boot from Raid

[Stephen P Richardson]

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Quoting leavitt@webcom.com:
> 
> > > > 2.51. We would like to boot the 4000 from the raid and mirror the root =
> > > > volume. Is there any danger to booting booting from the array? Is there =
> > > The recommended method of disaster recovered is "high-availability"...
> > > dd your root disk to an equivalent internal disk on a nightly basis.

	I hesitate to get into this.... but if the thing that you
	are trying to protect yourself against is an errant program
	or a misapplied patch, mirroring will only faithfully
	reproduce the error on the mirrors.  It provides no protection
	against these errors.  If, however the thing that you are
	trying to protect against is a sudden crash from a failing
	disk, mirroring my just be the ticket.

	It remains to be seen if (by me anyway) if the mirroring will
	actually prevent a crash from a failed root disk, and even if
	it does, will it leave what is running in a state that is
	useful?

	dd with tweaks for vfstab works fine - I've employed this and
	tested it many times over quite a few years without any
	problems.
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Regards,
Stephen

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