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Re: [dm-devel] Device-mapper-multipath RDAC



On Tuesday 25 September 2007 06:54:39 Hannes Reinecke wrote:
> Nuno Fernandes wrote:
> > hello,
> >
> > Just a question:
> >
> > With recent support for rdac hardware handler in kernel 2.6.23-rc7, what
> > configuration should be in storage DS4700? AVT (Automatic Volume
> > transfer) turned on or off?
>
> Off. AVT is the acronym for 'Automated Volume Transfer', ie the array tries
> to transfer the volumes from one controller to the other automatically.
>
> > When it's turned on, luns keep on jumping from controller to controller..
>
> Indeed. That's to be expected.
>
> As a rule:
>
> - With rdac hardware handler: AVT off
I'm in the process of testing avt in the kernel.

> - Without hardware handler: AVT on
With this situation i don't have any point of failure but the lun keeps on 
jumping (because of the alive path check of multipathd) and the performance 
is awfull.

Best regards
Nuno Fernandes

>
> Cheers,
>
> Hannes


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