Re: Is there a grand plan for FC failover?

James Bottomley
2004-01-29T16:01:50Z

On Thu, 2004-01-29 at 10:24, Philip R. Auld wrote:
> I think the place to do load balancing would be below the block queue so that
> the IOs are coalesced. IMO, until you've merged the individual block requests
> you can't make a good decision about how to balance the load.

Yes, that's what I think too, so the elevator should go above dm, with a
vestigial elevator between dm and sd simply for SCSI to use in queuing.

Unfortunately, the way it works today is that the elevator is between dm
and sd. I know people are thinking about how to change this, but I'm
not sure how far anyone's got.

James