[dm-devel] [RFC] pathchecker

[Joe Thornber]

On Mon, Mar 01, 2004 at 10:38:06PM +0100, christophe varoqui wrote:
> I confirm the current event notification scheme is useable for the 
> pathchecker. I have a prototype I'll post this week.

Excellent.

> Speaking of that I call for comment on the saneness of the following 
> general rule : what about the multipath configuration tool isolating 
> failed paths in a fallback PG ? They would be marked Active as no IO 
> went through them, and thus be exercised in case high priority paths all 
> fail. If they are hot-activated by the controler (think a controler LUN 
> handling switchover), they will work as-is. If they are really failed, 
> they will just be marked as such.

I think you'll need a set of fallback PGs corresponding to the
original PGs.

I think it's a good idea, definitely worth trying.  It'll reduce the
chances of io failing when there really is a valid path.

- Joe