
Fabric OS 5.3.0 administrator guide 351
18 Administering Extended Fabrics
This chapter contains procedures for using the Extended Fabrics licensed feature, which extends the
distance that interswitch links (ISLs) can reach over a dark fiber or DWM connection. The Extended Fabrics
feature is not used over FCIP connections over IP WANs. To use extended ISL modes, you must first install
the Extended Fabrics license. For details on obtaining and installing licensed features, refer to
”
Maintaining licensed software features
” on page 36.
About extended link buffer allocation
As the distance between switches and the link speed increases, additional
buffer-to-buffer credits
are
required to maintain maximum performance. The number of credits reserved for a port depends on the
switch model and on the extended ISL mode for which it is configured.
For the following switches, each
port group
contains four ports and uses a common pool of credits.
•
4/8 SAN Switch or 4/16 SAN Switch
•
MSA SAN Switch 2/8
•
SAN Switch 2/8 EL
•
SAN Switch 2/8V
•
SAN Switch 2/16V
•
SAN Switch 2/32
•
Core Switch 2/64
•
SAN director 2/128
Because the number of credits available for use within each port group is limited, configuring ports for
extended links on these models might cause other ports to become disabled if there are not enough buffer
credits available; for example:
•
If two 2-Gbps ports in a group are configured for L1 mode, each will be allocated enough
buffer-to-buffer credits to cause the other two ports in the group to become disabled.
•
A port connected to a device that is in loopback mode might become disabled for lack of buffers if
another port in that group is set to L2 mode.
For the following switches, each
port group
contains eight ports and uses a common pool of credits.
•
Brocade 4Gb SAN Switch for p-Class BladeSystem
•
Brocade 4Gb SAN Switch for c-Class BladeSystem
•
SAN Switch 4/32
•
4/64 SAN Switch
•
4/32B SAN Switch
•
400 Multi-protocol Router
•
4/256 SAN Director, using the following port blades:
• FC4-16
• FC4-16IP
• FC4-32
• FC4-48
• FR4-18i
Summary of Contents for AA979A - StorageWorks SAN Switch 2/8V
Page 1: ...HP StorageWorks Fabric OS 5 3 x administrator guide Part number 5697 0244 November 2009 ...
Page 16: ...16 ...
Page 20: ...18 ...
Page 24: ...24 Introducing Fabric OS CLI procedures ...
Page 116: ...118 Maintaining configurations ...
Page 170: ...172 Managing administrative domains ...
Page 200: ...202 Installing and maintaining firmware ...
Page 222: ...224 Routing traffic ...
Page 274: ...286 Administering FICON fabrics ...
Page 294: ...306 Working with diagnostic features ...
Page 350: ...362 Administering Extended Fabrics ...
Page 438: ...440 Configuring the PID format ...
Page 444: ...446 Configuring McData Open Fabric mode ...
Page 450: ...452 Understanding legacy password behaviour ...