Multipath behavior

["Billy Crook" <bcrook@xxxxxxxxxxxxxxxxxxxxxx>]

I am considering implementing multipath for iSCSI.  Documentation is
scant though, so I thought I'd ask my questions here.

Does mdadm multipath loadbalance IO, or just allow for failover, or both?
Is there any advantage to notifying mdadm pre-emptively if possible
before a path goes down?
I assume bringing a path online has to be done manually like adding a
disk.  Can spare paths be used?

The kernel involved is 2.6.18-53.1.14.el5.

Thank you for your time.
-Billy Crook
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