[dm-devel] How is the multipath pg policy group-by-nodename any different th an the failover policy ...

[Arthur Bergman]

On 27 Apr 2005, at 21:07, christophe varoqui wrote:

> The fact is, the world seems full of exotic hardware. This pgpolicy was
> asked by IBM for their ESS class controllers were each node has a 
> unique
> nodename whatever the number of paths to the node. Having a penalty
> switching a LU from one node to its peer, they were interested in group
> all paths to a node together.
>


Yep, I think I requested it for the San Volume Controllers (IBM 
standalone ESS derivative (and as I say that no doubt a ESS team member 
will flame me ;))

> Well, at least it's what I understood from the request :/
>
> One would have thought that group_by_serial was here to cover that
> scenario, but that hardware just doesn't work that way.

All the path have the same serial, but the show up from different nodes.

Cheers
Arthur


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