This utility is an external way to safely remove a pool from dCache. It takes an 
inventory of all the files in all pools, and determines all files which are 
unique on the pool to be retired. It then starts P2P transfers of just the unique 
files. If any in-process P2P transfers do not appear to be valid (too-slow or 
do not appear to have a valid source/destination), they will be cancelled. Valid 
in-process P2P transfers will be accounted for and multiple P2P transfers for 
the same file will not be started. 

dCache admin interface access and a PNFS mount are required. 

One of the design goals of this tool is that the last line of output will inform 
the site administrator whether or not it is safe to turn the pool off. If the pool 
is not safe to turn off, the approximate number of in-progress plus started 
transfers will be printed out.

Usage:
osg_dc_retire_a_pool [-dryrun] <poolname>

Required Arguments:
	<poolname>      Name of the pool to retire.

Optional Arguments:
	-dryrun         Perform a dry run, i.e., no files will be actually copied.