Re: [dm-devel] [PATCH] HP SW support take 3

[Mike Christie <michaelc cs wisc edu>]

Christophe Varoqui wrote:
> I confirm a robust behaviour now with take 3.
> Here is a take 4 that move to an appropriate "best effort mode", ie always return success.
>
> The point is, whenever DM start submitting io the an asleep controler, precede with a START command. If it fails ... too bad, the consecutive io will fail and DM will try another PG. Had to do that because take 3 interprets an error where the controler switch have correctly happened.

ok so is it if the controller is already failed over and we send the 
START command, rq->errors had some value so I ended up failing the 
operation, right? Let me send a patch that will dump the sense and 
rq->errors info out so we can see if there is some nice ASC/ASCQ value 
that will tell us this occured like with the LSI boxes.

> I guess we could suppress the sense buffer allocation if this "best effort mode" is agreed on.
>
> I also added path->dev->name to DMINFO() calls to make for a more informative output.

ok thanks I will add more output like that to other print statements.