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

Building a Metropolitan Cluster Using MetroCluster/CA
Preparing an MC/ServiceGuard Cluster for MetroCluster /CA
Chapter 388
• Primary (PVOL) and secondary (SVOL) volumes must be correctly
defined and assigned to the appropriate nodes in the XP hardware
configuration.
Figure 3-8 XP Series Primary and Secondary Volume Definitions
• Primary devices (PVOLs) must be locally protected (RAID 1 or RAID
5).
• Secondary devices (SVOLs) must be locally protected (RAID 1 or
RAID 5).
Setting Fence Levels
All devices defined in a given device group must be configured with the
same fence level. A fence level of DATA or NEVER results in synchronous
data replication; a fence level of ASYNC is used to enable asynchronous
data replication.
Data Center B
XP Series Array
PVOL
SVOL
CA link may be bidirectional
BC1
BC2
Data Center A
PVOLa
Optional
BCs
XP Series Array
SVOL
PVOL
BC3
BC4
SVOLa
Optional
BCs
Redundant, CA links
up to 100 kilometers with DWDM
for different disk devices
There may be multiple P/S devices
Packages with primary nodes
in this data center see this
XP as the primary side and
the XP in Data Center B
as the secondary side.
Packages with primary nodes
in this data center see this
XP as the primary side and
the XP in Data Center A
as the secondary side.