HP HSG Array Controller - Manual (Page 160)

B-20 StorageWorks Fibre Channel Storage Switch User's Guide
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: i-appb Telnet Commands Last Saved On: 4/7/99 12:36 PM
Table B-5
flashSet Command Field Descriptions
continued
Field Description
vc_link_ctl The Virtual Channel Link Control changes the link control channel. There are two
options: 0 and 1.
Option 0 forces data receipt acknowledgments on Class 2 channels to be sent back
on the data channel. This traffic consumes a portion of the available data channel
bandwidth.
Option 1 allows data receipt acknowledgment packets to use the VC-1 (internal
Switch traffic channel) which frees additional bandwidth in the data channel, and
transfers the data receipt traffic load to the Switch’s internal traffic channel.
vc_class2 Can be set to virtual channel 2, 3, 4, or 5.
The Switch provides the ability to tune the Switch in a specific application.
The first two virtual channels are reserved for the Switch’s internal functions and
are not available.
The default virtual channel settings are already optimized for Switch performance.
Changing the default values, if properly selected, may improve Switch performance
somewhat, but may also severely degrade performance. You should not change
these settings without full understanding the changes effects.
vc_class3 Can be set to virtual channel 2, 3, 4, or 5.
vc_multicas
t
The virtual channel multicast default is channel 7. 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.
priority 2-
7
The numbers displayed show the priorities assigned to each of the Switch’s virtual
channels. They 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.
continued