Users are advised that typical transaction rates during busy periods for metadata
operations (retrieving file and directory listings or expanding wildcards) can
run in the 400-500 per second range. Avoid trying to retrieve listings for directories
with large numbers of entries (such as /DSS), as this
could take several hours before any output will be returned. This could be an
issue if your FTP Client does not support setting the command timeout value.
When feasible, generate lists of MSS file names programmatically instead of using wildcard patterns. Capturing the output msls for a directory then using the grep on your local system may be faster than trying to use slow wildcard patterns in a directory containing many files.