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49-2
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 49 Configuring the SAN Extension Tuner
About the SAN Extension Tuner
Figure 49-1 SCSI Command Generation to the Virtual Target
The SET feature assists with tuning by generating varying SCSI traffic workloads. It also measures
throughput and response time per I/ O over an FCIP link.
Before tuning the SAN fabric, be aware of the following guidelines:
• Following these implementation details:
–
The tuned configuration is not persistent.
–
The virtual N ports created do not register FC4 features supported with the name server. This is
to avoid the hosts in the SAN from discovering these N ports as regular initiators or targets.
–
Login requests from other initiators in the SAN are rejected.
–
The virtual N ports do not implement the entire SCSI suite; it only implements the SCSI read
and write commands.
–
Tuner initiators can only communicate with tuner targets.
• Verify that the Gigabit Ethernet interface is up at the physical layer (GBIC and Cable connected—an
IP address is not required).
• Enable iSCSI on the switch (no other iSCSI configuration is required).
• Enable the interface (no other iSCSI interface configuration is required) (see the “Creating iSCSI
Interfaces” section on page 50-5).
• Configure the virtual N ports in a separate VSAN or zone as required by your network.
• Be aware that a separate VSAN with only virtual N ports is not required, but is recommended as
some legacy HBAs may fail if logins to targets are rejected.
• Do not use same Gigabit Ethernet interface to configure virtual N ports and FCIP links—use
different Gigabit Ethernet interfaces. While this is not a requirement, it is recommended as the
traffic generated by the virtual N ports may interfere with the performance of the FCIP link.
SAN Extension Tuner Setup
Figure 49-2 provides a sample physical setup in which the virtual N ports are created on ports that are
not a part of the FCIP link for which the throughput and latency is measured.
FCFC
WAN/MAN
IPS
fabric
IPS
fabric
Virtual initiator Virtual target
Read/Write I/O
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