Re: Multipath behavior

[Neil Brown <neilb@xxxxxxx>]

On Tuesday April 22, bcrook@xxxxxxxxxxxxxxxxxxxxxx wrote:
> 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.

I recommend against using md based multipath.  It is not being
seriously maintained.
dm (aka device mapper) based multipath is where the action is.

NeilBrown
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