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Configuring Host-Based File
C
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 storage-based mirroring (also called
array-based mirroring) and whether you want the mirroring to be synchronous or asynchronous.
Synchronous Mirroring
Figure C-1
Building A
Ethernet Switch
Server 1
Server 2
Server 3
Server 4
Fibre Channel
Switch
Fibre Channel
Disk Array
Original
IMPORTANT: The Business Continuity Clustering product does not perform data mirroring. You
must separately configure either storage-based mirroring or host-based file system 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
file system (NSS mirroring) that is part of OES 2 SP1 Linux. NSS mirroring is a checkpoint-based
synchronous mirroring solution. Data blocks are written synchronously to multiple storage devices.
It is an alternative to storage-based synchronous replication options.
IMPORTANT: NSS pool snapshot technology does not work in a business continuity cluster.
Section C.1, "Creating and Mirroring NSS Pools on Shared Storage," on page 142
Section C.2, "Creating NSS Volumes," on page 144
Section C.3, "Novell Cluster Services Configuration and Setup," on page 144
Section C.4, "Checking NSS Volume Mirror Status," on page 144
Synchronous
Mirroring
Building B
Ethernet Switch
Server 5
Server 6
Changes
Completion
Fibre Channel
Disk Array
Configuring Host-Based File System Mirroring for NSS Pools
®
Business Continuity Clustering
Server 7
Server 8
Fibre Channel
Switch
Mirror
C
NSS
TM
141
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Troubleshooting
