Silicon Graphics InfiniteStorage 4000 Series, Настройка и обслуживание

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Chapter 11: Maintaining a Storage Array 195
Error counts are calculated from the current baseline. The baseline describes the error
count values for each type of device in the Fibre Channel loop, either when the
controller goes through its start-of-day sequence or when you reset the baseline. The
baseline indicates the difference in error counts from the time the baseline was
established to the time you request the read link status data.
The script command set provides two commands for running RLS diagnostics:
 reset storageArray RLSBaseline
– Resets the RLS baseline for all
devices by setting all of the counts to 0.
 save storageArray RLSCounts
– Saves the RLS counters to a file that
you can review later. The default file name is
readLinkStatus.csv
.
Run the
reset storageArray RLSBaseline
command before you run the
save storageArray RLSBaseline
command.
The following table lists the type of data contained by the file that is generated by the
save storageArray RLSBaseline
command.
Table 27 RLS Baseline Data for the Storage Array
Type of Data Description
Devices A list of all devices on the Fibre Channel loop.
The devices appear in channel order. Within each channel, the devices
are sorted according to the device position in the loop.
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.