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Configuring Host-Based File
D
System Mirroring for NSS Pools
Several methods and scenarios exist for mirroring data between geographically separate sites. Each
method has its own strengths and weaknesses. For a Novell
system, you need to choose either host-based mirroring or SAN-based mirroring (also called array-
based mirroring) and whether you want the mirroring to be synchronous or asynchronous.
Synchronous Mirroring
Figure D-1
Building A
Ethernet Switch
Server 1
Server 2
Server 3
Fibre Channel
Switch
Fibre Channel
Disk Array
Original
IMPORTANT: The Business Continuity Clustering product does not perform data mirroring. You
must separately configure either SAN-based mirroring or host-based mirroring.
Storage-based synchronous mirroring is preferred and is provided by storage hardware
manufacturers. For information about storage-based mirroring, consult your storage system vendor
or see the storage system vendor documentation.
Host-based synchronous mirroring functionality is included with the Novell Storage Services
(NSS) file system (NSS mirroring) that is part of NetWare 6.5. NSS mirroring is a checkpoint-based
synchronous mirroring solution. Data blocks are written synchronously to multiple storage devices.
It is an alternative to SAN-based synchronous replication options.
IMPORTANT: NSS pool snapshot technology does not work in a business continuity cluster.
Section D.1, "Creating and Mirroring NSS Partitions on Shared Storage," on page 138
Synchronous
Mirroring
Server 4
Changes
Completion
Configuring Host-Based File System Mirroring for NSS Pools
®
Business Continuity Clustering
Building B
Ethernet Switch
Server 5
Server 6
Server 7
Fibre Channel
Switch
Fibre Channel
Disk Array
Mirror
D
Server 8
TM
137
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