Configuring External Ports - HP AA979A - StorageWorks SAN Switch 2/8V Administrator's Manual

For dynamic long distance links, you can approximate the number of buffer credits using the following
formula:
Buffer credits = [(distance in km) * (data rate) * 1000] / 2112
The data rate is 1.0625 for 1 Gbit/sec, 2.125 for 2 Gbit/sec, and 4.25 for 4 Gbit/sec and Fibre Channel.

Configuring external ports

The number of ports that can be configured per port group for each switch depends on both port speed
and distance. The following sections specify the number of external ports available for each switch at a
specific port speed and distance.
4/16 SAN Switch and 4/8 SAN Switch
The number of ports that can be configured per port group at various distances is summarized in
Table 70 4/16 SAN Switch and 4/8 SAN Switch
Speed
(Gbit/sec)
1
2
4
SAN Switch 2/8V, SAN Switch 2/16V, SAN Switch 2/32, SAN Director 2/128, and 4/256
SAN Director (FC2-16 port blades)
The number of ports that can be configured per port group at various distances is summarized in
Table 71
SAN Switch 2/8V, SAN Switch 2/16V, SAN Switch 2/32, SAN Director 2/128, and
4/256 SAN Director
Speed
(Gbit/sec)
1
2
4
SAN Switch 4/32
The number of ports that can be configured at various distances is summarized in
Table 72 SAN Switch 4/32
Speed
(Gbit/sec)
1
328 Administering Extended Fabrics
Number of ports allowed at distance (km)
10 km 25 km
16 ports 12 ports
16 ports 6 ports
8 ports 3 ports
Number of ports allowed at distance (km)
10 km 25 km
4 ports 4 ports
4 ports 3 ports
n/a n/a
Number of ports allowed at distance (km)
10 km 25 km
32 ports 32 ports
50 km 100 km
6 ports 3 ports
3 ports 1 port
1 port 0
50 km 100 km
L1 mode: 4 up to 2
ports ports
LD mode:
3 ports
up to 2 1port
ports
n/a n/a
50 km 100 km
32 ports up to 15
ports
250 km 500 km
1 port n/a
n/a n/a
n/a n/a
250 km 500 km
n/a n/a
n/a n/a
n/a n/a
Table 72.
250 km 500 km
up to 6 up to 3
ports ports
Table 70.
Table 71.