HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

159Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
6
Configuring the Optional
Advanced DRM Solutions
This chapter provides information on different Data Replication Manager (DRM)
configurations for special circumstances.
The topics discussed in this chapter are:
■ Bidirectional DRM Solution‚ page 159
■ Stretched Cluster DRM Solution‚ page 160
Bidirectional DRM Solution
DRM supports active/active bidirectional solutions by using two sets of storage arrays—one
set for each direction. This allows both sites to be actively processing data and backing up
each other in the event that one of the two sites fails.
As shown in Figure 25, there are two servers at each site. These site-specific servers could be
clustered during normal operations to provide high-availability applications. When a site
failure occurs, the application that was running at the failed site is moved to the backup
member of the surviving cluster, and is started using the surviving storage and the other half of
the surviving cluster.
With additional servers and storage, the bidirectional DRM configuration can scale up to 20
switches in each fabric, supporting, for example, 96 servers and 8 arrays at each site. All
intersite technologies—such as DRM over ATM, DRM over direct fiber, DRM over IP, and
DRM over WDM—support bidirectional use of DRM.
For more information on intersite technologies, refer to the HP StorageWorks Continuous
Access and Data Replication Manager SAN Extensions Reference Guide.