HP HSG Array Controller - Manual (Page 51)

Managing the Switch 3-17
Compaq Confidential – Need to Know Required
Writer: Bill Reitz Project: StorageWorks Fibre Channel Storage Switch User's Guide Comments:
Part Number: AA-RHBYA-TE 135267-001 File Name: d-ch3 Managing the Switch Last Saved On: 4/7/99 11:59 AM
7
The virtual channel multicast is shown as channel 7 in the example. You may
change the multicast transmission channel to either virtual channel 6 or 7.
Verify that the multicast channel has the frame class priority set to the frame
class of the expected traffic.
VC Priorities
Pressing <Enter>, while VC Priorities is selected, displays:
VC Priorities
0.1.2.2.2.2.3.3
The numbers displayed show the priorities assigned to each of the Switch’s
virtual channels. Positions 1 and 2, starting at the left of the display, are fixed
and displays 0 or 1.
The first position, a ‘0’, shows and indicates that this virtual channel, assigned
to handle internal Switch traffic, has the highest priority. This priority value
cannot be changed by the user.
The second position, indicated with a 1, shows the priority assigned by the
virtual channel link control as described in the VC Link Ctl on page 4-22.
The third through eighth positions can have only a 2 or a 3 indicating that the
channel gives priority to either Class 2 frame traffic or to Class 3 frame traffic.
Alternate BB_credit
Pressing <Enter>, while Alternate BB_credit is selected, displays:
Alternate BB_credit
0
The number is used in an ACC to an NL_Port's FLOGI. If this number is 0, an
NL_Port must wait for an R_RDY before it can send a frame to the FL_Port in
a loop. If this number is 1, an NL_Port can immediately send a frame to the
FL_Port without waiting for an R_RDY. Thus reducing the loop turn around
time and increases performance. For a complete description of buffer-to-buffer
credit, refer to the industry specification Fibre Channel Physical and
Signalling Interface (FC-PH).