HP StorageWorks Fabric OS 6.x administrator guide (5697-7344, March 2008)

422 Configuring and monitoring FCIP extension services
Figure 39 Network using FCIP
Compression
Data compression can be enabled or disabled on FCIP tunnels. The default setting is to disable
compression.
Traffic shaping
Traffic can be shaped by establishing a rate limit per tunnel. A committed rate can be assigned to a port
that guarantees a fixed amount of bandwidth. The committed rate setting insures that a FCIP tunnel will
operate at a specific fixed rate (given enough FC traffic to consume it). If too little committed rate is
defined, the FCIP tunnel would be limited to that rate and performance could be limited.
QoS concepts and implementation over FCIP
Quality of Service (QoS) refers to policies for handling differences in data traffic. These policies are based
on data characteristics and delivery requirements. For example, ordinary data traffic is tolerant of delays
and dropped packets, but voice and video data are not. QoS policies provide a framework for
accommodating these differences in data as it passes through a network.
FOS versions 6.0.0 and higher provide for Fibre Channel QoS through internal QoS priorities. Those
priorities can be mapped to TCP/IP network priorities. There are two options for TCP/IP network based
QoS:
• Layer three DiffServ code Points (DSCP).
• VLAN tagging and Layer two class of service (L2CoS).
Fibre
Channel
initiator
Fibre
Channel
initiator
Fibre
Channel
Target
Fibre
Channel
Target
VE_Port
VE_Port
VE_Port
VE_Port
Data Center
FC SAN
Office
FC SAN
Office
FC SAN
Office
FC SAN
IP WAN
Network
4/256
SAN Director
with FR4-18i
Blade
4/256
SAN Director
with FR4-18i
Blade
400 MP
Router
400 MP
Router
26412a