[Info-vax] Wide area cluster, metro area network, seeking info

[Phillip Helbig undress to reply]

In article <edf76cb6-6de7-4d9a-a2cf-011bcb19997en at googlegroups.com>,
Rich Jordan <jordan at ccs4vms.com> writes: 

> We are looking at the possibility of putting VMS boxes in two locations, wi=
> th Integrity boxes running VSI VMS.  This is the very beginning of the rese=
> arch on the possibility of clustering those two servers instead of just hav=
> ing them networked.  Probably have to be master/slave since only two nodes =
> and no shared storage.

If you do a cluster, do it right.  What advantage does master/slave give 
you?  Note that a third node (at a third location) can be a really small 
box doing essentially nothing.

If there is no shared storage (hence you hint at there can be no quorum 
disk), use HBVS with (at least) one member at each location.  With a 
third (quorum) node and HBVS, your cluster will continue to work if one 
node is lost.  With master/slave, it won't, so what's the point?