Revision 5ac3214f README

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(e.g. more than five or ten machines); at lower sizes, the
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computations they do can also be done manually.
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Most of the tools revolve around the concept of keeping the cluster
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N+1 compliant: this means that in case of failure of any node, the
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instances affected can be failed over (via ``gnt-node failover`` or
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``gnt-instance failover``) to their secondary node, and there is
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enough memory reserved for this operation without needing to shutdown
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other instances or rebalance the cluster.
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Available tools
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---------------
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path—usually ``/usr/lib/ganeti/iallocators`` or
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``/usr/local/lib/ganeti/iallocators``. See the man page hail(1).
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Cluster capacity estimator
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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The ``hspace`` program will, given an input instance specification,
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estimate how many instances of those type can be place on the cluster
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before it will become full (as in any new allocation would fail N+1
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checks). For more details, see the man page hspace(1).
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Integration with Ganeti
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-----------------------
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