HP Storage EVA Capacity Upgrades - Manual (Page 32)

32 Switch Management
The Low-level link statistic page displays the following information:
Diagnostic Description
Sync Loss The number of times loss of word synchronization has occurred on the port for a
specified time. Synchronization loss occurs when the port stops receiving a signal for a
period of time.
Possible causes include:
• Poor connections or signal strength
• Rogue devices
• Intermittent hardware failures or line conditions.
Invalid OS The number of invalid ordered sets that have been detected. Ordered Set (OS) or word
errors can occur in bursts, which can potentially cause system performance issues.
Possible causes include:
• Poor connections or signal strength
• Rogue devices
• Intermittent hardware failures.
Link Failure The number of times the link on a port has failed.
Link-Reset Tx The number of Link-Reset ordered sets transmitted on the port. A port enters the
Link-Reset transmit state to begin the link reset procedure. This is caused by a link
timeout or a connection error.
Link-Reset Rx The number of Link-Reset ordered sets received on the port. The Link-Reset is
performed upon receiving a Link-Reset. When a port is receiving Link-Resets, it will
begin transmitting idles.
OLS Tx The number of Offline-State ordered sets (OLS) transmitted on the port. A port enters
the Offline-State to perform initialization after a port has been powered on or internally
reset. A port also enters Offline-State prior to powering off or performing internal
diagnostics. OLSs are normal; however, high counts could indicate problems.
OLS Rx The number of Offline-State ordered sets (OLS) received on the port. A port enters the
Offline-State when it receives the OLS primitive sequence. While in this state, the port
transmits the Link Reset (LR) primitive ordered set initiating a Link Reset. OLSs are
normal; however, high counts could indicate problems.
Figure 15 Advanced Statistics Low-level Link page