A file's striping is inherited from its parent directory. The
lfs getstripe command can be used to determine the striping for a file, or the default striping for a directory. Note that each file and directory can have its own striping pattern. This means that a user can set striping patterns for his own files and/or directories. The default stripe width for a user may be 1 or 4, you can determine by running
lfs getstripe /lustre/medusa/$USER.
This command will also give you information on the striping information for a directory/file.
lfs find -v