User`s guide

VIXEL INSPEED™ SAN STORAGE SWITCH MODEL 375 CHAPTER 3 SWITCH MANAGEMENT
USER’S GUIDE
EMBEDDED
IN THE FUTURE OF STORAGE 35
Diagnostics
The following settings are available.
Clear on Stall In situations where the switch is operating in switching mode, some
devices may fall into an operating mode where the device has opened
a target but has not released the connection to the target. When this
policy is enabled, the switch can detect this condition and
automatically recover when this situation arises.
Bypass on No Activity The switch detects the amount of time a data stream has gone
without receiving a comma. The time setting is set to 100 (.001
seconds). When this policy is enabled, the switch bypasses the
disruptive port when the threshold is exceeded.
Bypass on Ordered Set Error Ordered Set (OS) errors are detected and counted for each individual
port. When this policy is enabled, a port is bypassed when its OS
count exceeds the threshold setting. The threshold setting is based on
the number of ordered set errors identified in 10 seconds.
Note: This threshold setting can be adjusted on the Web Manager’s
Advanced Functions Switch Thresholds page.
Bypass on CRC Error Cyclic Redundancy Check (CRC) errors are detected and counted for
each individual port. When this policy is enabled, a port is bypassed
when its CRC count exceeds the threshold setting. The threshold
setting is based on the number of CRC errors identified in 10 seconds.
User intervention is required to return the port into the zone.
Recovery methods include replacing the defective component, cycling
power to the device on the port, removing and reinserting the
bypassed port, or cycling power to the switch.
Note: This threshold setting can be adjusted on the Web Manager’s
Advanced Functions Switch Thresholds page.
Setting Description
Port Control The method for controlling a port. Options include:
• auto – the default setting. The switch will automatically insert a port
based on policy settings. This prevents the insertion of incompatible
ports, which may cause disruption.
• bypass – removes a port from the network. Use this mode to keep a
device out of an initialization cycle when troubleshooting.
• extLoopback – removes a port from the network and routes the
port's receive signal back through the port's transmitter. Use this
mode to isolate a specific zone for troubleshooting or to test a
transceiver’s circuitry and attached media from the node end.
• insert – allows ports whose transceivers cannot derive a valid clock
or "K" character (Ordered Set) to join a zone. Use this mode
cautiously – devices without valid characters may put bad data into
a zone, causing the zone to go down.
Bypass on Clock Delta The switch determines the relative frequency of the signal being
received by a port to the internal switch clock. The result of this
test allows the determination of how far apart in frequency the
switch’s clock is in relation to the clock of the received signal – the
clock delta. If the clock delta exceeds a set threshold, the switch is
notified and the port may be bypassed if necessary. Typically, clock
drift is slow enough to allow the removal and replacement of a
defective part before the defective part begins to affect system
performance.
Setting Description