Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Building an Extended Distance Cluster Using MC/ServiceGuard
Two Data Center Architecture
Chapter 254
Two Data Center FibreChannel Implementations
FibreChannel Using Hubs
Although this architecture should work with the maximum number of
nodes allowed in an MC/ServiceGuard cluster, this cluster architecture
has been tested with a maximum of 4 nodes. Therefore, the largest
configuration currently supported is 2 nodes per data center as shown in
Figure 2-1.
Figure 2-1 Two Data Centers with FibreChannel Hubs
This configuration can be implemented using any HP-supported
FibreChannel devices. Disks must be available from all nodes using
redundant links. Not all links are shown in Figure 2-1. The two cluster
lock disks should be located on separate FibreChannel loops to guard
against single point of failure. The lock disks can also be used as data
disks. They must be connected to all nodes using redundant links (not all
links are shown in Figure 2-1).
Nodes can connect to disks in the same data center using short wave
ports, and hubs can connect between data centers using long-wave ports.
This gives you a maximum distance of 10 kilometers between data
centers, making it possible to locate data centers in different buildings.
Data Replication
using
Short-wave ports
up to 500 meters
Long-wave ports
up to 10 kilometers
MirrorDisk/UX
cluster
lock
A
node 1a
pkg C
node 2a
pkg D
Power
cluster
lock
B
B
Data Center B
FibreChannel
Hub
FibreChannel
Hub
A
Circuit
4
Power
Circuit
3
cluster
lock
A
node 1
pkg A
node 2
pkg B
Power
cluster
lock
A
B
Data Center A
FibreChannel
Hub
FibreChannel
Hub
A
Circuit
2
Power
Circuit
1
FCAL loop 1
FCAL loop 2