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

Building a Metropolitan Cluster Using MetroCluster/SRDF

Preparing a Cluster for MetroCluster/SRDF

Chapter 4146

due to a failure of a remote device or an RDF link, the data flow to the

other Symmetrix will be halted in less than one second. Once mirroring

is resumed, any updates will propagate with normal SRDF operation.

Figure 4-12 shows that when there is a break in the links between two of

the Symmetrix frames, the use of consistency groups (dashed oval lines)

ensures that the other two links are also suspended.

Figure 4-12 2 X 2 Node and Data Center Configuration with Consistency

Groups

node 3

pkg C

Data Center B

node 5

Third Location

node 1

pkg A

node 2

pkg B

node 6

Data Center A

(Arbitrators)

node 4

pkg D

When these links

both go down...

These links are

suspended by EMC

PowerPath...