rcp gets hung for long time


 
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Operating Systems AIX rcp gets hung for long time
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Old 01-09-2008
rcp gets hung for long time

Every evening I run a script in AIX production box, which executes below command:
rcp prod_bkup.tar prodapp@IP:/data/appl/prod

This will rcp a backup of around 11 GB from production to another machine (runs every evening so overwrites previous one). Just to keep the backup safe. Since 2-3 days, I notice that this command takes quite longer than normal days and when I go to another machine - I am allowed to login, But when I give 'ls -l /data/appl/prod' nothing comes and looks like session on both windows kinda hung state. Then I press ctrl C on production.

Then next morning 'ls -l /data/appl/prod' command also works fine on another machine and I see that backup is copied (not fully, the byte difference is there) of around 2 hours later time stamp. And I tried rcping a 0 byte from production to another machine also works fine. Only problem comes during evening when I rcp the backup.

Do you know what might be going wrong and where can I find such logs on AIX machines?

Please advice / Thank you.
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rcp(1c) 																   rcp(1c)

Name
       rcp - remote file copy

Syntax
       rcp [ -p ] file1 file2
       rcp [-r] [-p] file... directory

Description
       The command copies files between machines.  Each file or directory argument is either a remote file name of the form rhost:path, or a local
       file name.  Local file names do not contain colons (:) or backslashes () before colons.

       Note that the command refuses to copy a file onto itself.

       If path is not a full path name, it is interpreted relative to your login directory on rhost.  To ensure that the metacharacters are inter-
       preted  remotely,  a  remote  host's  path  can be quoted by either using a backslash () before a single character, or enclosing character
       strings in double (") or single (') quotes.

       The command does not prompt for passwords; your current local user name must exist on rhost and allow remote command execution via

       The command handles third party copies, where neither source nor target files are on the current machine.  Hostnames may also take the form
       rname@rhost  to	use rname rather than the current user name on the remote host.  The following example shows how to copy the file foo from
       user1@mach1 to user2@mach2:
	$ rcp user1@mach1:foo  user2@mach2:foo
       Note that the file .rhosts on mach2 in user2's account must include an entry for mach1 user1.  Also note that it may be necessary  for  the
       person implementing the command to be listed in the .rhosts file for mach1 user1.

       By  default,  the mode and owner of file2 are preserved if file2 already exists.  Otherwise, the mode of the source file modified by on the
       destination host is used.

Options
       -p   Preserves the modification times and modes of the source files in its copies, ignoring the

       -r   Copies files in all subdirectories recursively, if the file to be copied is a directory.  In this  case  the  destination  must  be  a
	    directory.

Restrictions
       The  command  is  confused by output generated by commands in a .cshrc file on the remote host.	In particular, `where are you?' and `stty:
       Can't assign requested address' are messages which can result if output is generated by the startup file.

See Also
       ftp(1c), rlogin(1c), rsh(1c)

																	   rcp(1c)