On 2006-05-19T06:40:54, Alan Robertson <[EMAIL PROTECTED]> wrote:
> Normally, you want only one subcluster - total. We are not doing
> clusters of clusters here. Just one single cluster which spans sites.
> Also known as a split-site cluster.
(Actually, I believe they are more commonly known as "stretch
clusters".)
I believe it is more appropriate to treat these clusters as
stacked/layered clusters.
This is the way how for example Novell's Business Continuity Cluster
product models this, and also, to my knowledge, Veritas's solution,
whose name I forgot. Stretch clusters are, to the best of my knowledge,
somewhat limitted because they essentially pretend that it is a flat
structure, but it isn't in practice...
Anyway, treating it like this also helps with other forms of
layered/stacked clusters, say virtualization.
> Of course, one could always have a corporate intranet which had three
> sites - with each one taking over for one of the others in sort of a
> ring arrangement. Site A is backed up by B. Site B is backed up by C.
> Site C is backed up by A. I have no idea how common this is...
BCC sees 2 and 3 site arrangements fairly easily, or so I'm told.
Sincerely,
Lars Marowsky-Brée
--
High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business -- Charles Darwin
"Ignorance more frequently begets confidence than does knowledge"
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