inventory database template
This section expands the cluster concept for protection against the failure of a server
introduced in inventory database template to include clustering for load distribution. We discuss three
different forms of clusters based upon the example of a file server. The three different
forms of inventory database template cluster are comparable to the modes of multipathing software.
The starting point is the so-called shared-null configuration. The components
are not designed with built-in redundancy. If a server fails, the file system itself
is no longer available, even if the data is mirrored on two different disk subsystems and
redundant I/O buses are installed between server and disk subsystems.
In contrast to the shared-null configuration, shared-nothing clusters protect against
the failure of a server. The basic form of the shared-nothing cluster was discussed in
relation to the protection of a file server against the failure of a server.
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