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

[Nuno Fernandes <npf-mlists eurotux com>]

On Monday 24 September 2007 19:33:32 Chandra Seetharaman wrote:
> On Mon, 2007-09-24 at 17:06 +0100, 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?
>
> Hardware handler is needed only for RDAC mode, AVT would work without
> the hardware handler.
>
> The decision to use RDAC or AVT depends on your configuration.
>
> > When it's turned on, luns keep on jumping from controller to controller..
>
> dm-multipath will use the other path (in AVT mode, IOW, jump) only if
> I/O in the current path fails.
Yes, but it keeps on jumping because of the multipathd monitoring of alive 
paths.

I'm was already in the process of using
linux-2.6-md-add-dm-rdac-hardware-handler.patch from 
kernel-2.6.18-36.el5.src.rpm (from RHEL5U1 Beta) to rebuild RHEL5.0 stable 
kernel.. Hope it works..

Best rgds
Nuno Fernandes

>
> > Thanks
> > Nuno Fernandes
> >
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