Fabric OS Reference Manual

44 Fabric OS Reference Manual
Sequence Level
Switching
When this feature is set to 1, frames of the same
sequence from a particular source are transmitted
together as a group. When this feature is set to 0,
frames are transmitted interleaved among
multiple sequences.
Under normal conditions, Sequence Level
Switching should be disabled for better
performance. However, some host adapters have
performance issues when receiving interleaved
frames from multiple sequences. When there are
such devices attached to the fabric, Sequence
Level Switching should be enabled.
Disable Device
Probing
When this is set, devices that do not register with
the Name Server are not present in the Name
Server data base. Set this mode only if the switch
N_Port
discovery process (PLOGI, PRLI,
INQUIRY) causes an attached device to fail.
VC Encoded Address
Mode
When this mode is set, frame source and
destination address utilize an address format
compatible with some first-generation switches.
Set this mode only if the fabric includes this type
of switch.
Disable Translative
Mode
The setting applies only if VC Encoded Address
Mode is also set. This feature, when set, disables
translative addressing to achieve explicit address
compatibility with some first-generation
switches. Set this feature only if hardware or
software systems are attached to the fabric that
explicitly rely on a specific frame address format.
Per-frame Route
Priority
In addition to the eight virtual channels used in
frame routing priority, support is also available
for per-frame based prioritization when this value
is set. When set, the virtual channel ID is used in
conjunction with a frame header to form the final
virtual channel ID.