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-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.

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