Re: "Enhanced" MD code avaible for review

[Jeff Garzik]

Justin T. Gibbs wrote:
> > Jeff Garzik wrote:
> >
> > Just so there is no confusion...  the "failing over...in userland" thing I
> > mention is _only_ during discovery of the root disk.
>
>
> None of the solutions being talked about perform "failing over" in
> userland.  The RAID transforms which perform this operation are kernel
> resident in DM, MD, and EMD.  Perhaps you are talking about spare
> activation and rebuild?

This is precisely why I sent the second email, and made the 
qualification I did :)

For a "do it in userland" solution, an initrd or initramfs piece 
examines the system configuration, and assembles physical disks into 
RAID arrays based on the information it finds.  I was mainly implying 
that an initrd solution would have to provide some primitive failover 
initially, before the kernel is bootstrapped...  much like a bootloader 
that supports booting off a RAID1 array would need to do.

	Jeff



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