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 4140
See the SymCLI manual for instructions on creating the appropriate
pseudo device files.
• R1 and R2 devices must have been correctly defined and assigned to
the appropriate nodes in the internal configurations that is
downloaded by EMC support staff.
Figure 4-8 EMC R1 and R2 Definitions
• R1 devices are locally protected (RAID 1 or RAID S).
• R2 devices are locally protected (RAID 1, RAID S or BCV).
NOTE It is highly recommended that the R2 device is locally protected with
RAID 1 or RAID S. If the R2 device is protected with BCV, and if it
fails and there is a failover, the package cannot operate on the BCV
device. The R2 device has to be fixed, the data has to be restored
from the BCV device to the new R2 device, before the package can
start.
Data Center B
Symmetrix Array
R1
R2
SRDF link may be bidirectional
B1
B2
Data Center A
R1a
Optional
BVCs
Symmetrix Array
R2
R1
B2
B1
R2a
Optional
BVCs
Redundant, hardwired ESCON links
up to 60 kilometers with repeaters
for different disk devices
There may be multiple R1/R2 devices
Packages with primary nodes
in this data center see this
Symmetrix as the R1 side and
the Symmetrix in Data Center B
as the R2 side.
Packages with primary nodes
in this data center see this
Symmetrix as the R1 side and
the Symmetrix in Data Center A
as the R2 side.