Why 24? It has to do with the assignment of drive letters,
such as A, B, C, D, E, F, G, and so on. While there are 26 letters in the alphabet, only 24
of those letters are available for assignment to hard drives. Since the discrete point of
disk failure is now a mount point, it??™s limited to the number of available drive letters.
In any event, I dislike the use of multiple instances on a single node. It requires
more configuration and more to manage. At the moment, however, server consolidation
is popular, so running multiple instances on a single node might be a scenario
you need. Keep in mind that under a cluster environment, an instance is also considered
a virtual server, so you must have a separate IP address for each instance. You
also need to take a great deal of time reviewing your configuration. You don??™t want to
be in the position where clustering is ineffective because you didn??™t partition your
resources properly, allowing for all of them to be run on a single node. Management
will not react favorably.
CHAPTER 7 n CLUSTERING 187
Failover in a Cluster
Hopefully, the process of failover will never occur.
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