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hcheck - Online in the Cloud

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This is the command hcheck that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



hcheck - Cluster checker


hcheck {backend options...} [algorithm options...] [reporting options...]

hcheck --version

Backend options:

{ -m cluster | -L[ path ] |-t** data-file | -I path }

Algorithm options:

[ --no-simulation ] [ --max-cpu cpu-ratio ] [ --min-disk disk-ratio ] [ -l limit ] [ -e
score ] [ -g delta ] [ --min-gain-limit threshold ] [ -O name... ] [ --no-disk-moves ] [
--no-instance-moves ] [ -U util-file ] [ --ignore-dynu ] [ --ignore-soft-errors ] [
--evac-mode ] [ --select-instances inst... ] [ --exclude-instances inst... ] [
--no-capacity-checks ]

Reporting options:

[--machine-readable[=*CHOICE*] ] [ -p[ fields ] ] [ --print-instances ] [ -v... | -q ]


hcheck is the cluster checker. It prints information about cluster's health and checks
whether a rebalance done using hbal would help.

This information can be presented in both human-readable and machine-readable way.

Note that it does not take any action, only performs a rebalance simulation if necessary.

For more information about the algorithm details check hbal(1).

Additionally, hcheck also checks if the cluster is globally N+1 redundant. That is, it
checks for every node, if after failing over the DRBD instances all instances on that node
that with disks externally stored can be restarted on some other node.


Only perform checks based on current cluster state, without trying to simulate

Do not check for global N+1 redundancy, i.e., do not warn if the shared-storage
instances of one node cannot be moved to the others should that node fail.

For a detailed description about the options listed above have a look at htools(1),
hspace(1) and hbal(1).


Report bugs to project website (http://code.google.com/p/ganeti/) or contact the
developers using the Ganeti mailing list (ganeti@googlegroups.com).

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