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Figure 1-4
between the sites. BCC uses eDirectory and Identity Manager to synchronize cluster information
between the two clusters.
Figure 1-4
Server
1A
Fibre Channel
Switch
Using additional products, all services, applications, and data can be rendered through the Internet,
allowing for loss of service at one site but still providing full access to the services and data by virtue
of the ubiquity of the Internet. Data and services continue to be available from the other mirrored
sites. Moving applications and services to the Internet frees corporations from the restrictions of
traditional LAN-based applications. Traditional LAN applications require a LAN infrastructure that
must be replicated at each site, and might require relocation of employees to allow the business to
continue. Internet-based applications allow employees to work from any place that offers an Internet
connection, including homes and hotels.
1.4.3 Low-Cost Business Continuity Cluster Solution
The low-cost business continuity cluster solution is similar to the previous two solutions, but
replaces Fibre Channel storage arrays with iSCSI storage arrays. Data block mirroring can be
accomplished either with iSCSI-based block replication, or host-based mirroring. In either case,
snapshot technology can allow for asynchronous replication over long distances. However, the low-
cost solution does not necessarily have the performance associated with higher-end Fibre Channel
storage arrays.
24
BCC 1.1 SP2: Administration Guide for NetWare 6.5 SP8
depicts a four-site business continuity cluster that uses storage-based data replication
Multiple-Site Business Continuity Cluster
Four independent clusters in
geographically separate sites
Building A
Ethernet Switch
Server
Server
Server
2A
3A
4A
Fibre Channel
Disk Arrays
Cluster Site 1
Building B
Ethernet Switch
WAN
eDirectory
IDM
Server
Server
1B
2B
SAN
Disk blocks
Fibre Channel
Disk Arrays
Cluster Sites 2, 3, and 4
Building D
Building C
Server
4C
Server
Server
3B
4B
Channel
Channel
Fibre Channel
Switch
Server
4D
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