Re: "Enhanced" MD code avaible for review
From: Jeff Garzik
Date: Thu Mar 25 2004 - 19:18:16 EST
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.
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