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

Building a Metropolitan Cluster Using MetroCluster/SRDF
Designing a Disaster Tolerant Architecture for use with MetroCluster/SRDF
Chapter 4 127
Two Data Centers and Third Location with
Arbitrator(s)
This is the recommended and supported disaster tolerant architecture
for use with MetroCluster with Symmetrix SRDF. This architecture
consists of two main data centers with an equal number of nodes and a
third location with one or more arbitrator nodes; see Figure 4-1.
Figure 4-1 Two Data Centers and Third Location with Arbitrators
The local EMC Symmetrix disk array is called the R1 disk for all nodes
and packages in a given data center. The remote EMC Symmetrix disk
array, where the data is replicated is called the R2 disk. In Figure 4-1
SRDF link
R1 R2
replicated data for package A
R1 R2
replicated data for package B
R2 R1
replicated data for package C
R1
replicated data for package D
node 1
pkg A
Data Center A
Highly Available
R2
node 2
pkg B
PVlinks
EMC
disk array
Symmetrix
network
SRDF link
network
PVlinks
Network
arbitrator 1
Third Location
arbitrator 2
networknetwork
Power
Power Circuit 5 Power Circuit 6
Circuit
1
A
Power
Circuit
2
node 1a
pkg C
Data Center B
node 2a
pkg D
PVlinks
network
network
PVlinks
Power
Circuit
3
Power
Circuit
4
B
D
1
C
1
EMC
disk array
Symmetrix
C
D
B
1
A
1