[dm-devel] Device-mapper-multipath RDAC

[Chandra Seetharaman]

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.
> 
> Thanks
> Nuno Fernandes
> 
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-- 

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    Chandra Seetharaman               | Be careful what you choose....
              - sekharan at us.ibm.com   |      .......you may get it.
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