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

[Phillip Helbig undress to reply]

In article <d460f2c9-7c6d-4c56-b8fb-61d7e669ebdcn at googlegroups.com>,
Rich Jordan <jordan at ccs4vms.com> writes: 

> The point: the system at the second location will be a backup site and/or 
> disaster recovery box.  There is no third location and I have no info on 
> the likelihood of getting one. 

A two-node cluster either has each node with equal votes, and both must 
be present, or one has more than the other, and the cluster needs it to 
survive.  In either case, if you lose the main site, some manual 
intervention will be necessary to allow the cluster to continue.  And 
that might not be worth much without access to data.  It is possible for 
the two nodes to share storage, but unless that is at a third location, 
with your setup above things won't work at all if you lose one of the 
sites.  HBVS, at least if we are talking about several kilometers 
between the nodes, say, is probably the way to go.  (The individual 
members can be anything VMS sees as a disk, i.e. could come from a SAN 
or whatever.)

Unless the office is at one of the locations, just put a third 
node---the smallest you can find---in the office.  (You could also put a 
quorum disk there, and could thus keep going after losing one of the big 
sites, but a node probably offers more for little or no additional 
cost.)