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 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
       TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE  OF  THIS  SOFTWARE,  EVEN  IF
       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Ganeti                                                                                                 HCHECK(1)