HP AE370A HP StorageWorks Fabric OS 6.x administrator guide (5697-7344, March - Page 418

QoS concepts and implementation over FCIP, Compression, Traffic shaping

Page 418 highlights

Fibre Channel initiator Data Center FC SAN 400 MP Router VE_Port Fibre Channel initiator IP WAN Network VE_Port VE_Port Office FC SAN VE_Port 400 MP Router 4/256 SAN Director with FR4-18i Blade Office FC SAN Office FC SAN 4/256 SAN Director with FR4-18i Blade Fibre Channel Target Fibre Channel Target Figure 39 Network using FCIP 26412a 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). 422 Configuring and monitoring FCIP extension services

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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
Ch
a
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a
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Fibre
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a
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a
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FC SAN
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4/256
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4/256
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400 MP
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400 MP
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26412a