Requirement:
Oracle and other products allow a verification of a backup without the need to start/stop the associated database server. For example, see Oracle's utility

http://download.oracle.com/docs/cd/B10500_01/server.920/a96652/ch13.htm

The user wants to

• specify the location of the backed up files For example, often a separate machine is used for backups / verification, so mount the backup files.
• run a verification on
  • • one or more dbs
    • one or more collections within a db
• report the results of the verification
• redirect the output to a file

Workaround:

• mount the backup files on a host
• start the mongod with --dbpath pointing to the directory mounted
• log on with mongo shell
• run db.<collection>.verify() on each collection
• shutdown the mongod

Business Need:

• User experience
  Simple command line allows easy automation, without the need to start and stop the mongod process and allocating ports.