NAME

       hscan - Scan clusters via RAPI and save node/instance data

SYNOPSIS

       hscan [-p] [--no-headers] [-d path ] cluster...

       hscan --version

DESCRIPTION

       hscan  is a tool for scanning clusters via RAPI and saving their data in the input format used by hbal(1)
       and hspace(1).  It will also show a one-line score for each cluster scanned or, if desired,  the  cluster
       state as show by the -p option to the other tools.

       For each cluster, one file named cluster.data will be generated holding the node and instance data.  This
       file can then be used in hbal(1) or hspace(1) via the -t option.   In  case  the  cluster  name  contains
       slashes  (as  it  can  happen  when  the  cluster  is a fully-specified URL), these will be replaced with
       underscores.

       The one-line output for each cluster will show the following:

       Name   The name of the cluster (or the IP address that was given, etc.)

       Nodes  The number of nodes in the cluster

       Inst   The number of instances in the cluster

       BNode  The number of nodes failing N+1

       BInst  The number of instances living on N+1-failed nodes

       t_mem  Total memory in the cluster

       f_mem  Free memory in the cluster

       t_disk Total disk in the cluster

       f_disk Free disk space in the cluster

       Score  The score of the cluster, as would be reported by hbal(1) if run on the generated data files.

       In case of errors while collecting data, all fields after the name of the cluster are replaced  with  the
       error display.

       Note: this output format is not yet final so it should not be used for scripting yet.

OPTIONS

       The options that can be passed to the program are as follows:

       -p, --print-nodes
              Prints  the  node status for each cluster after the cluster's one-line status display, in a format
              designed to allow the user to understand the node's most important parameters.  For  details,  see
              the man page for htools(1).

       -d path
              Save the node and instance data for each cluster under path, instead of the current directory.

       -V, --version
              Just show the program version and exit.

EXIT STATUS

       The  exist  status  of  the  command  will  be zero, unless for some reason loading the input data failed
       fatally (e.g.  wrong node or instance data).

BUGS

       The program does not check its input data for consistency, and aborts with  cryptic  errors  messages  in
       this case.

EXAMPLE

              $ hscan cluster1
              Name     Nodes  Inst BNode BInst  t_mem  f_mem t_disk f_disk      Score
              cluster1     2     2     0     0   1008    652    255    253 0.24404762
              $ ls -l cluster1.data
              -rw-r--r-- 1 root root 364 2009-03-23 07:26 cluster1.data

REPORTING BUGS

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

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-masterd(8) (master 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,  2007,  2008,  2009,  2010,  2011, 2012 Google Inc.  Permission is granted to copy,
       distribute and/or modify under the terms of the GNU General Public  License  as  published  by  the  Free
       Software Foundation; either version 2 of the License, or (at your option) any later version.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-
       licenses/GPL.