HP StorageWorks Fabric OS 6.2 administrator guide (5697-0016, May 2009)

Fabric OS 6.2 administrator guide 429
NOTE: QoS requires an additional 14 buffer credits per active port so maximum supported distances may
be lower.
The HP StorageWorks SAN Director 6 Port 10Gb FC blade supports a maximum distance of 100 km on
each of the 6x 10 Gb/s ports.
To get an estimated maximum equally distributed distance for n number of ports at a particular ("X")
speed, divide the 1-port maximum distance of the switch at X speed by n. For example, for three ports
running at 2 Gb/s on HP StorageWorks 8/8 and 8/24 SAN Switches, the maximum equally distributed
distance is: 486 / 3 = 164 km.
Buffer credit recovery
Buffer credit recovery does not require configuration. This feature allows links to recover after R_RDYs are
lost when the credit recovery logic is enabled. The buffer credit recovery feature also maintains
performance. If a credit is lost, a recover attempt is initiated. During link reset, the frame and credit loss
counters are reset without performance degradation.
This feature is supported only on E_Ports that are configured for long distance and are connected between
the following switch or blade models:
• HP StorageWorks 8/8 and 8/24 SAN Switches, HP StorageWorks 8/40 SAN Switch, HP
StorageWorks 8/80 SAN Switch
• HP StorageWorks SAN Director 16 Port 8Gb FC blade, HP StorageWorks SAN Director 32 Port 8Gb
FC blade, HP StorageWorks SAN Director 48 Port 8Gb FC blade
If a long-distance E_Port from one of these supported switches/blades is connected to any other switch or
blade type, the buffer credit recovery feature is disabled.
HP StorageWorks 400
Multi-Protocol Router
500 250 100 N/A
HP StorageWorks 4/256 SAN
Director 16 Port 4Gb Blade
500 250 100 N/A
HP StorageWorks B-Series iSCSI
Director Blade
500 250 100 N/A
HP StorageWorks 4/256 SAN
Director 32 Port 4Gb Blade
500 250 100 N/A
HP StorageWorks 4/256 SAN
Director 48 Port 4Gb Blade
500 250 100 N/A
HP StorageWorks SAN Director
48 Port 4Gb FC blade
500 250 100 N/A
HP StorageWorks SAN Director
16 Port 8Gb FC blade
2588 / 2780 1294 / 1390 647 / 695 324 / 348
HP StorageWorks SAN Director
32 Port 8Gb FC blade
2588 / 2780 1294 / 1390 647 / 695 324 / 348
HP StorageWorks SAN Director
48 Port 8Gb FC blade
2460 / 2652 1230 / 1326 615 / 663 308 / 332
B-Series Multi-Protocol Router
Blade
500 250 100 N/A
Table 83 Supported Distances (continued)
Maximum supported distances with 2112 Byte Frame
Size
(1-port allocated all unreserved buffer credits) in km @
Switch/blade model 1 Gb/s 2 Gb/s 4 Gb/s 8 Gb/s