Brocade Fabric OS Administrator's Guide Supporting Fabric OS v6.3.0 (53-1001336-02, November 2009)

466 Fabric OS Administrator’s Guide
53-1001336-02
Buffer credit management
20
For the FC8-x blades, the first number in the Unreserved buffers column designates the number of
unreserved buffers per port group in Brocade DCX and DCX-4S platforms; the second number
designates the unreserved buffers in a Brocade 48000 director. For example, for the FC8-48, 1228
designates the number of unreserved buffers per port group and 1324 number designates the
number in a Brocade 48000 director. Additional buffers are available with the Brocade 48000
director because of fewer buffers allocated for back-end port connections. Implementing extended
fabrics between Brocade 2xxx switches and switches running any Fabric OS v6.x is not supported.
Maximum configurable distances for Extended Fabrics
Table 91 shows the maximum supported extended distances that can be configured for one port
on a specific switch or blade at different speeds.
FS8-18 16 8 1604
FX8-24 12 12 1060
TABLE 91 Configurable distances for Extended Fabrics
Maximum distances that can be configured assuming 2112 Byte Frame Size
Switch/blade model 1 Gbps 2 Gbps 4 Gbps 8 Gbps
300 972 486 243 121
4100/5000 500 250 100 N/A
4900 500 250 100 N/A
5100 3388 1694 847 423
5300 588 294 147 73
5410 1164 582 291 145.5
5424 972 486 243 121.5
5450 940 470 235 117.5
5480 972 486 243 121.5
7500 500 250 100 N/A
7600 500 250 100 N/A
7800 822 410 205 102
Brocade Encryption Switch 2784 1392 696 348
FA4-18 500 250 100 N/A
FC4-16 500 250 100 N/A
FC4-16IP 500 250 100 N/A
FC4-32 500 250 100 N/A
FC4-48 500 250 100 N/A
FC8-16 2589 / 2781 1294 / 1390 647 / 695 323 / 347
FC8-32 2589 / 3277 1294 / 1638 647 / 819 323 /409
TABLE 90 Buffer credits (Continued)
Switch/blade model Total FC ports
(per switch/blade)
User port group size Unreserved buffers
(per port group)