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Novell Business Continuity Clustering 1.1 Administration Guide for Linux
Figure 1-4
Multiple-Site Business Continuity Cluster
Using the Novell Portal Services, iChain
®
, and ZENworks
®
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.
Low-Cost Business Continuity Cluster Solution
The low-cost business continuity cluster solution is similar to the previous two solutions, but
replaces Fibre Channel arrays with iSCSI 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.
Server
2D
Server
3D
Server
1D
Server
4D
Fibre Channel
Switch
Fibre Channel
Disk Arrays
Building D
Ethernet Switch
Server
2C
Server
3C
Server
1C
Server
4C
Fibre Channel
Switch
Fibre Channel
Disk Arrays
Building C
Ethernet Switch
Server
2B
Server
3B
Server
1B
Server
4B
Fibre Channel
Switch
Fibre Channel
Disk Arrays
Building A
Building B
Server
2A
Ethernet Switch
Server
3A
Server
1A
Server
4A
Fibre Channel
Switch
Disk blocks
Ethernet Switch
WAN
eDirectory
DirXML
Four independent clusters in
geographically separate sites
Cluster Sites 2, 3, and 4
SAN
Cluster Site 1
Fibre Channel
Disk Arrays
Summary of Contents for BUSINESS CONTINUITY CLUSTERING 1.1 SP1
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