Collecting Switch-on-a-Chip Error Statistics
Switch-on-a-chip (SOC) error statistics provide information about the loop-switch ports that are connected
to the Fibre Channel devices in a storage subsystem. (RLS counts provide information about the Fibre
Channel devices.) Reporting SOC error statistics is available only on storage subsystems that have SOC
loop-switch devices that are incorporated into the controller disk drive channel or the ESM circuitry. SOC
devices are integrated circuits that join together Fibre Channel devices in arbitrated loop topologies. SOC
devices automatically collect statistical information for each SOC port that is connected to a controller
port, an ESM port, a disk drive port, or an expansion connector. An IBM Technical Support representative
can use the statistical information with RLS counts to identify problems with Fibre Channel devices that
are attached to the loop.
SOC error statics include this information:
v
The port state
v
The port insertion count
v
The loop state
v
The loop up count
v
The CRC error count
v
The relative frequency drift error average
v
The loop cycle count
v
The operating system (OS) error count
v
The port connections attempted count
v
The port connections held off count
v
The port utilization
The method for collecting error statistics starts by establishing a baseline for the SOC error statistics. The
baseline consists of SOC error statistics that are established at a set time for each SOC device on the loop.
The baseline is set by clearing the error counters in each SOC device. You can set a device baseline by
performing one of these actions:
v
Turning on the power to the device or resetting the device
v
Running the
reset storageSubsystem SOCBaseline
command
In addition, each controller also initializes the SOC error counters in all of the expansion drawers that are
attached to the controller following a cold boot (power-on or hot insertion). If you add an expansion
drawer while the power is turned on to the storage subsystem, a new baseline is established for any
device on the expansion drawer.
After you have established the baseline for the SOC devices, you run the storage subsystem for a
predetermined amount of time (for example, two hours). At the end of the run time, you collect the SOC
error statistics by saving the information to a file. To save the information, run the
save
storageSubsystem SOCCounts file
filename
command. The default name of the file that contains the SOC
error statistics is
socStatistics.csv
. You can use any file name that has the
.csv
extension.
Analyzing the SOC error statistics is beyond the scope of normal storage subsystem management. After
you have collected the SOC error statistics in a file, send the file to an IBM Technical Support
representative.
Recovery Operations
Recovery operations include repairing the storage subsystem and returning it to an operational state. This
might involve replacing a failed CRU, a failed controller, or a disk drive or restoring data or the storage
subsystem to operation. For information about when it is appropriate to replace a CRU, see “Routine
Maintenance” on page 11-1.
Chapter 11. Maintaining a storage subsystem
11-13
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