=head1 B<NAME>

B<xdcp> - Concurrently copies files to or from multiple nodes.

=head1 B<SYNOPSIS>

B<xdcp> I<noderange>  [B<-C> I<context>] [B<-f> I<fanout>]
[B<-L>]  [B<-l>  I<userID>] [B<-o> I<node_options>]
[B<-r> I<node_remote_shell>] [B<-R>] [B<-t> I<timeout>]
[B<-T>] [B<-v>] [B<-X> I<env_list>] sourcefile.... targetpath

B<xdcp> [B<-h> | B<-V> | B<-q>]


=head1 B<DESCRIPTION>

The B<xdcp> command concurrently copies files  to  or  from  remote  target
nodes. The command issues a remote copy com-
mand for each node or device specified. When files are  pulled  from  a
target,  they  are  placed  into  the  target_path with the name of the
remote node or device appended to  the  copied  source_file  name.  The
/usr/bin/rcp command is the model for syntax and security. If using hierarchy, then xdcp actually runs on the service node that is servicing the compute node. The file to be copied to the compute node must first be copied to the service node. 

B<TARGET> B<SPECIFICATION>:

Target specification is identical for the xdcp and xdsh commands. See the
xdsh man page for details on specifying targets for the xdcp command.

B<REMOTE> B<USER>:

A  user_ID  can  be specified for the remote copy command.  Remote user
specification is identical for the xdcp and xdsh commands.  See  the  xdsh
command for more information.

B<REMOTE> B<COMMAND> B<COPY>:
The  B<xdcp>  command  uses  a  configurable remote copy command to execute
remote copies on remote targets. Support is explicitly  provided  for
Remote  Shell  rcp  command,  the  OpenSSH  scp  command  and  the
/usr/bin/rsync command.

For node targets, the remote copy command is determined by the  follow-
ing order of precedence:


1. The B<-r> flag.

2. The B</usr/bin/scp> command.

B<COMMAND> B<EXECUTIONS>
The  maximum  number  of  concurrent remote copy command processes (the
fanout) can be specified with the -f flag or the DSH_FANOUT environment
variable.  The  fanout is only restricted by the number of remote shell
commands that can be run in  parallel.  You  can  experiment  with  the
DSH_FANOUT  value on your management server to see if higher values are
appropriate.

A timeout value for remote copy command execution can be specified with
the  -t  flag or DSH_TIMEOUT environment variable. If any remote target
does not respond within the timeout value, the xdcp command displays  an
error message and exits.

The  -T flag provides diagnostic trace information for dcp command exe-
cution. Default settings and the actual remote copy commands  that  are
executed to the remote targets are displayed.

The  xdcp  command can be executed silently using the -Q flag; no target
standard output or standard error is displayed.

=head1 B<OPTIONS>

=over 5

=item B<sourcefile...>

Specifies the complete path for the file to be  copied  to  or
from  the  target.  Multiple files can be specified. When used
with the -R flag, only a single directory  can  be  specified.
When  used  with the -P flag, only a single file can be specified.

=item B<targetpath>

Specifies the complete path to copy one  or  more  source_file
files  to on the target. If the -P flag is specified, the tar-
get_path is the local host location for the copied files.  The
remote file directory structure is recreated under target_path
and  the  remote  target  name  is  appended  to  the   copied
source_file name in the target_path directory.


=item B<-C>|B<--context> I<context>

The default context to use when resolving target names. The
I<context> value must correspond to a valid context  extension
module  in  the B</opt/xcat/xdsh/Context> directory. For
example, the B</opt/xcat/xdsh/Context/DSH.pm> file is  the  module
for the B<DSH> context.

=item B<-f>|B<--fanout> I<fanout_value>

Specifies a fanout value for the maximum number of  concur-
rently  executing  remote shell processes. Serial execution
can be specified by indicating a fanout value of B<1>.  If  B<-f>
is not specified, a default fanout value of B<64> is used.

=item B<-h>|B<--help>

Displays usage information.


Specifies a remote user name to use for remote command exe-
cution.


=item B<-o>|B<--node-options> I<node_options>

Specifies options to pass to the remote shell  command  for
node  targets.  The options must be specified within double
quotation marks ("") to distinguish them from B<xdsh> options.

=item B<-p>|B<--preserve>

Preserves  the  source  file characteristics as implemented by
the configured remote copy command.


=item B<-P>|B<--pull>

Pulls (copies) the files from the targets and places  them  in
the  target_path  directory on the local host. The target_path
must be a directory. Files pulled from  remote  machines  have
._target  appended  to  the  file  name to distinguish between
them. When the -P flag is used with the -R flag,  ._target  is
appended to the directory. Only one file per invocation of the
xdcp pull command can be pulled from the specified  targets.


=item B<-q>|B<--show-config>

Displays the current environment settings for all DSH
Utilities commands. This includes the values of all environment
variables  and  settings  for  all  currently installed and
valid contexts. Each setting is prefixed with  I<context>:  to
identify the source context of the setting.


=item B<-r>|B<--node-rcp> I<node_remote_copy>

Specifies  the  full  path of the remote copy command used
for remote command execution on node targets.


=item B<-R>|B<--recursive> I<recursive>

Recursively  copies files from a local directory to the remote
targets, or when specified with the -P flag, recursively pulls
(copies)  files  from  a remote directory to the local host. A
single source directory can be specified using the source_file
parameter.

=item B<-t>|B<--timeout> I<timeout>

Specifies the time, in seconds, to wait for output from any
currently executing remote targets. If no output is
available  from  any  target in the specified I<timeout>, B<xdsh>
displays an error and terminates execution for the remote
targets  that  failed to respond. If I<timeout> is not specified,
B<xdsh> waits indefinitely to continue processing output  from
all  remote  targets.  When specified with the B<-i> flag, the
user is prompted for an additional timeout interval to wait
for output.

=item B<-T>|B<--trace>

Enables trace mode. The B<xdcp> command prints diagnostic
messages to standard output during execution to each target.

=item B<-v>|B<--verify>

Verifies each target before executing any  remote  commands
on  the target. If a target is not responding, execution of
remote commands for the target is canceled. When  specified
with the B<-i> flag, the user is prompted to retry the
verification request.

=item B<-V>|B<--version>

Displays the B<xdcp> command version information.

=back


=head1 B<Environment> B<Variables>

=over 4

=item B<DSH_CONTEXT>

Specifies the default context to use  when  resolving
targets. This variable is overridden by the B<-C> flag.

=item B<DSH_ENVIRONMENT>

Specifies a file that contains environment variable
definitions to export to the target before executing  the  remote
command. This variable is overridden by the B<-E> flag.

=item B<DSH_FANOUT>

Specifies  the fanout value. This variable is overridden by
the B<-f> flag.

=item B<DSH_NODE_OPTS>

Specifies the options to use for the remote  shell  command
with  node targets only. This variable is overridden by the
B<-o> flag.

=item B<DSH_NODE_RCP>

Specifies the full path of the remote copy command  to  use
to  copy  local scripts and local environment configuration
files to node targets.

=item B<DSH_NODE_RSH>

Specifies the full path of the  remote  shell  to  use  for
remote  command execution on node targets. This variable is
overridden by the B<-r> flag.

=item B<DSH_NODEGROUP_PATH>

Specifies a colon-separated list of directories  that
contain node group files for the B<DSH> context. When the B<-a> flag
is specified in the B<DSH> context,  a  list  of  unique  node
names is collected from all node group files in the path.

=item B<DSH_PATH>

Sets the command path to use on the targets. If B<DSH_PATH> is
not set, the default path defined in  the  profile  of  the
remote I<user_ID> is used.

=item B<DSH_SYNTAX>

Specifies the shell syntax to use on remote targets; B<ksh> or
B<csh>. If not specified, the  B<ksh>  syntax  is  assumed.  This
variable is overridden by the B<-S> flag.

=item B<DSH_TIMEOUT>

Specifies  the  time,  in  seconds, to wait for output from
each remote target. This variable is overridden by  the  B<-t>
flag.

=back


=head1 B<Exit Status>

Exit  values  for  each  remote copy command execution are displayed in
messages from the xdcp command, if the remote copy command exit value is
non-zero.  A  non-zero return code from a remote copy command indicates
that an error was encountered during the remote copy. If a remote  copy
command  encounters an error, execution of the remote copy on that tar-
get is bypassed.

The xdcp command exit code is 0 if  the  xdcp  command  executed  without
errors  and  all remote copy commands finished with exit codes of 0. If
internal xdcp errors occur or the remote copy commands do  not  complete
successfully,  the xdcp  command exit value is greater than 0. The exit
value is increased by 1 for each successive instance of an unsuccessful
remote copy command execution.



=head1 B<Security>

The  B<xdcp>  command  has no security configuration requirements.  All
remote command security requirements  -  configuration,
authentication,  and authorization - are imposed by the underlying remote
command configured for B<xdsh>. The command  assumes  that  authentication
and  authorization  is  configured  between  the  local host and the
remote targets. Interactive password prompting is not supported;  an
error  is displayed and execution is bypassed for a remote target if
password prompting occurs, or if either authorization or
authentication  to  the  remote  target fails. Security configurations as they
pertain to the remote environment and remote shell command are
userdefined.


=head1 B<Examples>

=over 3


=item *

To copy the /etc/hosts file from all  nodes in the cluster
to the /tmp/hosts.dir directory on the local host, enter:

B<xdcp> I<all -P /etc/hosts /tmp/hosts.dir>

A suffix specifying the name of the target is  appended  to  each
file name. The contents of the /tmp/hosts.dir directory are similar to:

 hosts._node1   hosts._node4   hosts._node7
 hosts._node2   hosts._node5   hosts._node8
 hosts._node3   hosts._node6


=item *

To copy the directory /var/log/testlogdir  from  all  targets  in
NodeGroup1 with a fanout of 12, and save each directory on  the  local
host as /var/log._target, enter:

B<xdcp> I<NodeGroup1 -f 12 -RP /var/log/testlogdir /var/log>

=item *

To copy  /localnode/smallfile and /tmp/bigfile to /tmp on node1
using rsync, enter:

I<RSYNC_RSH=/usr/bin/ssh; xdcp -r /usr/bin/rsync -o "-z" \
node1 /localnode/smallfile /tmp/bigfile /tmp>

This command uses rsync with the RSYNC_RSH  environment  variable
and the -z flag on rsync.


=item *

To copy the /etc/hosts file from the local host to all the nodes
in the cluster, enter:

B<xdcp> I<all /etc/hosts /etc/hosts>


=item *

To copy the /etc/hosts  file  from  node1  and  node2  to the
/tmp/hosts.dir directory on the local host, enter:

B<xdcp> I<node1,node2 -P /etc/hosts /tmp/hosts.dir>


=back

=head1 B<Files>

B</opt/xcat/xdsh/Context/>

Location of the contexts available to use with  DSH  Utilities.

=head1 B<SEE ALSO>

L<xdsh(1)|xdsh.1>, L<noderange(3)|noderange.3>