Table 11-3. RLS Baseline Data for the Storage Subsystem (continued)
Type of Data Description
Baseline time The date and time when the baseline was set.
Elapsed time The time that has elapsed from when the baseline time was
set to when the read link status was gathered.
Invalid transmission
word (ITW)
The total number of ITW errors that were detected on the
Fibre Channel loop from the baseline time to the current date
and time. ITW might also be referred to as the Received Bad
Character Count.
ITW counts indicate that in decoding a read/write
transmission, the mapping did not exist and the running
disparity of the transmission word is invalid. This data is the
key error count to be used when analyzing the error count
data.
Link failure (LF)
The total number of LF errors that were detected on the Fibre
Channel loop from the baseline time to the current date and
time.
An LF condition is either a link fault signal, a loss of signal,
or a loss of synchronization condition. The LF signal indicates
a failure with the media module laser operation.
Loss of synchronization
(LOS)
The total number of LOS errors that were detected on the
Fibre Channel loop from the baseline time to the current date
and time.
LOS errors indicate that the receiver cannot acquire symbol
lock with the incoming data stream due to a degraded input
signal. If this condition persists, the number of LOS errors
increases.
Loss of signal (LOSG)
The total number of LOSG errors that were detected on the
Fibre Channel loop from the baseline date to the current date
and time.
LOSG errors typically indicate a loss of signal from the
transmitting node or the physical component within the Fibre
Channel loop. Physical components where a loss of signal
typically occurs include the gigabit interface converters
(GBICs), the Small Form-factor Pluggable (SFP) transceivers,
and the Fibre Channel fiber-optic cable.
Chapter 11. Maintaining a storage subsystem 11-11
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