HP StorageWorks MSA 2/8 - SAN Switch, Reference Manual

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153 Fabric OS Version 3.1.x/4.1.x Reference Guide
Sequence Level
Switching
When Sequence Level Switching 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 Disable Device Probing is set to 1, 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.
Disable RLS Probing When RLS Probing is not selected (enabled or “0”), the
switch port will issue RLS Extended Link Service to the
attached devices every four seconds to collect link status
data. Otherwise, RLS will not be sent to the devices. RLS
Probing is selected by default (disabled or “1”).
Suppress Class F
Traffic
When this mode is set to 1, all class F interswitch frames
are transmitted as class 2 frames. This is to support remote
fabrics which involve ATM gateways which don't support
class F traffic.
Sync IO Mode
(V3.1.x only)
When Sync IO mode is set to 1, FSPF frames are sent in
synchronous mode (expecting ACKs back from the other
side for every frame) which helps in detecting the failures
in the link between the ATM gateways in remote fabrics.
VC Encoded Address
Mode
When VC Encoded Address Mode is set to 1, frame
source and destination address utilize an address format
compatible with StorageWorks SAN switches. Set this
mode only if the fabric includes this type of switch.
Note: For V4.1.x, the VC Encoded Address Mode
parameter can only be modified from the Primary FCS
when security is installed and enabled. See “ Security
Commands ” on page 941.