[ale] RAID reconstruction

[Danny Cox]

David,

On Sun, 2002-11-24 at 18:25, David Corbin wrote:
> speed=6155K/sec is what the /proc/mdstat says.  Seeing as that is more than any number set in my system, I don't really know how to interpret it (too fast, or way too slow).  This is an two-drive IDE system, for reference....I kind of figured that since it is IDE, I'd see a lot more CPU utilization if it was I/O bound (It's about 5% CPU on a Pentium 200).

Well, that's another "trick" coming into play.  On a resync, the parity
block is recalculated, and compared to the extant parity block.  If it
matches, no write is performed.  So, on a resync, it can go much faster
than on the initial sync.  I'd say the figure you're getting is the raw
read rate for the N drives involved.

> -- 
> Danny Cox <danscox at mindspring.com>
> No Organization at ALL

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