NAME

       hcheck - Cluster checker

SYNOPSIS

       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 ]

DESCRIPTION

       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.

OPTIONS

       --no-simulation
              Only perform checks based on current cluster  state,  without  trying  to  simulate
              rebalancing.

       --no-capacity-checks
              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).

REPORTING BUGS

       Report  bugs  to  the project's issue tracker (https://github.com/ganeti/ganeti/issues) or
       contact the developers using the Ganeti mailing list.

SEE ALSO

       Ganeti overview and specifications: ganeti(7) (general  overview),  ganeti-os-interface(7)
       (guest OS definitions), ganeti-extstorage-interface(7) (external storage providers).

       Ganeti   commands:   gnt-cluster(8)   (cluster-wide   commands),  gnt-job(8)  (job-related
       commands), gnt-node(8) (node-related commands), gnt-instance(8) (instance commands),  gnt-
       os(8)  (guest  OS  commands),  gnt-storage(8) (storage commands), gnt-group(8) (node group
       commands), gnt-backup(8) (instance import/export commands), gnt-debug(8) (debug commands).

       Ganeti daemons: ganeti-watcher(8) (automatic instance restarter),  ganeti-cleaner(8)  (job
       queue cleaner), ganeti-noded(8) (node daemon), ganeti-rapi(8) (remote API daemon).

       Ganeti htools: htools(1) (generic binary), hbal(1) (cluster balancer), hspace(1) (capacity
       calculation), hail(1) (IAllocator plugin), hscan(1) (data gatherer from remote  clusters),
       hinfo(1) (cluster information printer), mon-collector(7) (data collectors interface).

COPYRIGHT

       Copyright (C) 2006-2015 Google Inc.  All rights reserved.

       Redistribution  and  use  in  source  and  binary forms, with or without modification, are
       permitted provided that the following conditions are met:

       1.  Redistributions of source code must retain the above copyright notice,  this  list  of
       conditions and the following disclaimer.

       2.  Redistributions in binary form must reproduce the above copyright notice, this list of
       conditions and the following  disclaimer  in  the  documentation  and/or  other  materials
       provided with the distribution.

       THIS  SOFTWARE  IS  PROVIDED  BY  THE  COPYRIGHT  HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
       EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  IMPLIED  WARRANTIES  OF
       MERCHANTABILITY  AND  FITNESS  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
       THE COPYRIGHT HOLDER OR CONTRIBUTORS BE  LIABLE  FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL,
       SPECIAL,  EXEMPLARY,  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
       OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  INTERRUPTION)
       HOWEVER  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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