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Two Clusters with Mirrored NSS Volumes in Separate Buildings
Figure 10-2
The maximum distance for a single stretch of fibre without optical repeaters to boost distance is
about 10 kilometers. There are various devices available that convert Fibre Channel to IP in order to
extend SANs to WAN scale.
NSS mirroring is synchronous, and so mirror I/Os must complete before the next I/O can be sent.
Performance is a function of time to do an I/O over the longest link.
10.10.2 Requirements for NSS Mirroring
NSS partitions must be mirrored after they are created. If you have an existing partition that you
want to mirror, you can either create another partition of equal size on another device to mirror the
first partition to, or let the mirroring software automatically create another partition of equal size on
another device.
Novell Cluster Services should be installed and running prior to creating and mirroring partitions on
shared storage.
When you create a Novell Cluster Services system that utilizes shared storage space (a Storage Area
Network or SAN), it is important to remember that all servers attached to the shared device, whether
in the cluster or not, have access to all of the volumes on the shared storage space unless you
specifically prevent such access. Novell Cluster Services arbitrates access to shared volumes for all
cluster nodes, but cannot protect shared volumes from being corrupted by non-cluster servers.
10.10.3 Creating and Mirroring NSS Pools on Shared Storage
Prior to creating and mirroring NSS partitions on shared storage, ensure that you have the following:
OES 2 Linux is installed on all servers that will be part of the cluster
152 OES 2 SP2: Novell Cluster Services 1.8.7 for Linux Administration Guide
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Troubleshooting
