  The proliferation of bandwidth-hungry applications and services forces
datacenter (DC) administrators to optimize the utilization of available
resources. Precisely, the network share of management traffic has grown
significantly because DC networks are becoming more sophisticated and require a
massive amount of data for efficient debugging and troubleshooting.
Accordingly, we use free space optics communication (FSO) with wavelength
division multiplexing (WDM) technology to build a flexible yet high-performance
logical network responsible for management traffic. The FSO-WDM can provide
reconfigurable multi-terabit topology over line-of-sight (LoS) links. Due to
space and processing capacity reasons, we can not offer direct connections from
every data rack to the network management racks. Alternatively, the data racks
are grouped together as each group is serviced for a duration of time matches
its average arrival-rate. Since the data racks showed different arrival-rates,
the hotspot racks are allocated with longer service time. The evaluation
results show that F4Tele carried out high throughput close to the expensive
solution (benchmark).
