/ - Diff - snf-ganeti - Greek Research and Technology Network's projects

     If the input file name is ``-`` (a single minus sign), then the request
     data will be read from *stdin*.
     Apart from input data, hail collects data over the network from all
     MonDs with the --mond option. Currently it uses only data produced by
     the CPUload collector.
     ALGORITHM
     ~~~~~~~~~
-...
       in the JSON request itself. This is mostly used for debugging. The
       format of the file is described in the man page **htools**\(1).
     \--mond
       If given the program will query all MonDs to fetch data from the
       supported data collectors over the network.
     \--mond-data *datafile*
       The name of the file holding the data provided by MonD, to override
       quering MonDs over the network. This is mostly used for debugging. The
       file must be in JSON format and present an array of JSON objects ,
       one for every node, with two members. The first member named ``node``
       is the name of the node and the second member named ``reports`` is an
       array of report objects. The report objects must be in the same format
       as produced by the monitoring agent.
     \--ignore-dynu
       If given, all dynamic utilisation information will be ignored by
       assuming it to be 0. This option will take precedence over any data
       passed by the MonDs with the ``--mond`` and the ``--mond-data``
       option.
     \--simulate *description*
       Backend specification: similar to the **-t** option, this allows
       overriding the cluster data with a simulated cluster. For details

     it is possible to make it go into a corner from which it can find no
     improvement, because it looks only one "step" ahead.
     The program accesses the cluster state via Rapi or Luxi. It also
     requests data over the network from all MonDs with the --mond option.
     Currently it uses only data produced by CPUload collector.
     By default, the program will show the solution incrementally as it is
     computed, in a somewhat cryptic format; for getting the actual Ganeti
     command list, use the **-C** option.
-...
       primary instances of the node)
     - standard deviation of the dynamic load on the nodes, for cpus,
       memory, disk and network
     - standard deviation of the CPU load provided by MonD
     The free memory and free disk values help ensure that all nodes are
     somewhat balanced in their resource usage. The reserved memory helps
-...
     that it's recommended to not have zero as the load value for any
     instance metric since then secondary instances are not well balanced.
     The CPUload from MonD's data collector will be used only if all MonDs
     are running, otherwise it won't affect the cluster score. Since we can't
     find the CPU load of each instance, we can assume that the CPU load of
     an instance is proportional to the number of its vcpus. With this
     heuristic, instances from nodes with high CPU load will tend to move to
     nodes with less CPU load.
     On a perfectly balanced cluster (all nodes the same size, all
     instances the same size and spread across the nodes equally), the
     values for all metrics would be zero. This doesn't happen too often in
-...
     \--ignore-dynu
       If given, all dynamic utilisation information will be ignored by
       assuming it to be 0. This option will take precedence over any data
       passed by the ``-U`` option.
       passed by the ``-U`` option or by the MonDs with the ``--mond`` and
       the ``--mond-data`` option.
     -S *filename*, \--save-cluster=*filename*
       If given, the state of the cluster before the balancing is saved to
-...
       other backends must be selected. The option is described in the man
       page **htools**\(1).
     \--mond
       If given the program will query all MonDs to fetch data from the
       supported data collectors over the network.
     \--mond-data *datafile*
       The name of the file holding the data provided by MonD, to override
       quering MonDs over the network. This is mostly used for debugging. The
       file must be in JSON format and present an array of JSON objects ,
       one for every node, with two members. The first member named ``node``
       is the name of the node and the second member named ``reports`` is an
       array of report objects. The report objects must be in the same format
       as produced by the monitoring agent.
     -m *cluster*
       Backend specification: collect data directly from the *cluster* given
       as an argument via RAPI. The option is described in the man page

       - vcpu ratio
       - spindle ratio
     \--mond
       If given the program will query all MonDs to fetch data from the
       supported data collectors over the network.
     \--mond-data *datafile*
       The name of the file holding the data provided by MonD, to override
       quering MonDs over the network. This is mostly used for debugging. The
       file must be in JSON format and present an array of JSON objects ,
       one for every node, with two members. The first member named ``node``
       is the name of the node and the second member named ``reports`` is an
       array of report objects. The report objects must be in the same format
       as produced by the monitoring agent.
     \--ignore-dynu
       If given, all dynamic utilisation information will be ignored by
       assuming it to be 0. This option will take precedence over any data
       passed by the ``-U`` option (available with hbal) or by the MonDs with
       the ``--mond`` and the ``--mond-data`` option.
     -m *cluster*
       Backend specification: collect data directly from the *cluster* given
       as an argument via RAPI. If the argument doesn't contain a colon (:),

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