Fabric OS Administrator’s Guide 451
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Buffer credit management 20

Buffer credits for each switch model

Table 92 shows the total ports in a switch or blade, number of user ports in a port group, and the
unreserved buffer credits available per port group.
SPIK
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.
TABLE 92 Buffer credits
Switch/blade model Total FC ports (per switch/blade) User port group size Unreserved buffers (per port group)
300 24 24 484
4100/5000 32 32 744
4900 64 16 584
5100 40 40 1692
5300 80 16 292
5410 12 12 580
5424 24 24 484
5450 26 26 468
5480 24 24 484
7500 16 8 377
7600 16 8 404
7800 16 16 408
VA-40FC 40 40 1692
Brocade Encryption Switch 32 16 1392
FA4-18 16 8 404
FC4-16 16 16 584
FC4-16IP 8 8 616
FC4-32 32 16 624
FC4-48 48 24 560
FC8-16 16 16 1292 / 1388
FC8-32 32 16 1292 / 1636
FC8-48 48 24 1228 / 1572
FR4-18i 16 8 377
FS8-18 16 8 1604
FX8-24 12 12 1060