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




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


----- CTO @ Fotango Ltd +447834716919 http://www.fotango.com/


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