HP StorageWorks Fabric OS 6.1.1 administrator guide (5697-0235, December 2009)

362 Administering extended fabrics
676 = a static number retrieved from Table 76.
If you allocate the entire 484 + 8 reserved buffers = 492 buffers to a single port, that port can support
486 km at 2 G, which is the reserved buffer for distance.
How many 50 km ports you can configure?
If you have a distance of 50 km at 8 Gbps then 484 / (206 – 8) = 2 ports.
If you have a distance of 50 km at 1 Gbps then 484 / (31 – 8) = 21 ports.
NOTE: The 10 Gbps FC10-6 blade has two port groups of three ports each. For extended ISLs, all buffers
available to a group are used to support one port at up to 120 km.
Displaying the remaining buffers in a port group
Issue the portbuffershow command to display all of the long distance buffer information for all the port
groups of the switch. Use the following syntax:
portbuffershow [[slotnumber/]portnumber]
where:
• slotnumber specifies, for bladed systems only, the slot number of the port group to display, followed
by a slash (/)
• portnumber specifies the number of a port associated with the port group, relative to its slot for
bladed systems. Use switchShow for a list of valid ports.
1. Connect to the switch and log in as admin.
2. Issue the portbuffershow command.
switch:admin> portbuffershow 1
User Port Lx Max/Resv Buffer Needed Link Remaining
Port Type Mode Buffers Usage Buffers Distance Buffers
---- ---- ---- ------- ------ ------- --------- -----
0 U - 8 0 - -
1 U - 8 0 - -
2 U - 8 0 - -
3 U - 8 0 - -
4 U - 8 0 - -
5 U - 8 0 - -
6 U - 8 0 - -
7 U - 8 0 - -
8 U - 8 0 - -
9 U - 8 0 - -
10 U - 8 0 - -
11 U - 8 0 - -
12 - 8 0 - -
13 - 8 0 - -
14 - 8 0 - -
15 - 8 0 - -
16 U - 8 0 - -
17 U - 8 0 - -
18 U - 8 0 - -
19 - 8 0 - -
20 U - 8 0 - -
21 U - 8 0 - -
22 U - 8 0 - -
23 U - 8 0 - - 484
switch:admin>