Commit 5ac3214f authored by Iustin Pop's avatar Iustin Pop
Browse files

Update the README file with hspace informations

parent 9abe9caf
......@@ -8,6 +8,13 @@ Note that these tools are most useful for bigger cluster sizes
(e.g. more than five or ten machines); at lower sizes, the
computations they do can also be done manually.
Most of the tools revolve around the concept of keeping the cluster
N+1 compliant: this means that in case of failure of any node, the
instances affected can be failed over (via ``gnt-node failover`` or
``gnt-instance failover``) to their secondary node, and there is
enough memory reserved for this operation without needing to shutdown
other instances or rebalance the cluster.
Available tools
---------------
......@@ -42,6 +49,15 @@ instances. It needs to be installed in Ganeti's iallocator search
path—usually ``/usr/lib/ganeti/iallocators`` or
``/usr/local/lib/ganeti/iallocators``. See the man page hail(1).
Cluster capacity estimator
~~~~~~~~~~~~~~~~~~~~~~~~~~
The ``hspace`` program will, given an input instance specification,
estimate how many instances of those type can be place on the cluster
before it will become full (as in any new allocation would fail N+1
checks). For more details, see the man page hspace(1).
Integration with Ganeti
-----------------------
......
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