NetApp::Snapshot::Schedule -- OO class which represents a snapshot schedule

    use NetApp::Filer;
    use NetApp::Aggregate;
    use NetApp::Volume;
    use NetApp::Snapshot;

    my $filer = NetApp::Filer->new({ .... });

    my $volume = $filer->get_volume( $volname );

    my $schedule = $volume->get_snapshot_schedule;

    $volume->set_snapshot_schedule(
        weekly		=> 0,
        daily		=> 2,
        hourly  	=> 4,
        hourlist	=> [ 4, 8, 12, 16 ],
    );

This class encapsulates a snapshot schedule for an aggregate of volume.

This method returns the parent object for the schedule, which is either a NetApp::Aggregate or NetApp::Volume object.

These methods return the number of weekly, daily, or hourly snapshots in the schedule.

This method returns a list of integers, each of which is one of the hours at which to create an hourly snapshot.