Owner manual

Agent information 46
• Check the physical proximity of the system to other electrical devices. Since electrical noise may cause a
Bus Fault error, check the AC circuit for other electrical devices.
• Ensure that the system temperature is within specified limits. Ensure that fans are operating and are not
blocked.
SCSI Bus Faults can be caused when two or more drives are set to the same SCSI ID. Ensure that storage
system and system SCSI IDs do not conflict.
In some instances, drive failure can cause SCSI Bus Faults. If you continue to receive many of these errors,
replace the drive.
• IRQ Deglitch—Displays the number of times that a glitch has been detected on the drive interface cable. Since
the controller retries the operation, problems can cause a drop in performance or, in some cases, data
corruption. Glitches indicate electrical noise on the drive cable or an intermittent failure of the drive electronics.
This item is considered a Problem Indicator that may be correctable without replacing the drive. Verify the status
of the drive by checking the following:
• Ensure that all system and storage system cables are intact and seated properly. You may need to replace
cables.
• Check the physical proximity of the system to other electrical devices. Since electrical noise may cause a
glitch error, check the AC circuit for other electrical devices.
• If you continue to receive many of these errors, replace the drive.
Failure Indicators
Use the Failure Indicators to determine the cause of a drive failure. Typically, the number of failures is zero when the
drive is operating normally. If a counter is not zero and the drive has not failed, there could be an intermittent
problem that may require the drive to be replaced.
The Failure Indicators are:
• Spinup Errors—When the physical drive fails due to the failure of a spin-up command, a Spinup Error occurs. If
the failure count is not zero and the drive has failed, replace the drive.
If the counter is not zero and the drive is OK (has not failed), there may be an intermittent problem that requires
drive replacement. If you observe that the count is increasing over time, replace the drive.
• Aborted Commands—The Aborted Commands counter records the number of times that a physical SCSI drive
returned an Aborted Command status when a SCSI command was attempted. This error count indicates
unsuccessful termination of the SCSI command. When the physical drive is failed due to aborted commands that
could not be retried successfully, Aborted Commands errors occur. If the number of errors is not zero and the
drive has failed, replace the drive.
If the counter is not zero and the drive is OK (has not failed), there may be an intermittent problem that requires
drive replacement. If you observe that the count is increasing over time, replace the drive.
• Reallocation Aborts—When the physical drive is failed due to an error that occurred when the controller was
trying to reallocate a bad sector, a Reallocation Abort error occurs.
Because of the nature of magnetic disks, certain sectors on a drive may have media defects. The reallocation
area part of the drive is set aside to compensate for these defects. The array controller writes information
addressed from unusable sectors to available sectors in the reallocation area.
If the number of reallocation abort errors is not zero and the drive has failed, replace the drive. If the counter is
not zero and the drive is OK (has not failed), there may be an intermittent problem that requires drive
replacement. If you observe that the count is increasing over time, replace the drive.
• Media Failures—When this physical drive fails due to unrecoverable media errors, a Media Failure occurs.
If the number of media failure errors is not zero and the drive has failed, replace the drive. If the counter is not
zero and the drive is OK (has not failed), there may be an intermittent problem that requires drive replacement.
If you observe that the count is increasing over time, replace the drive.
• Format Errors—When a format operation fails because the controller was unable to remap a bad sector, a
Format Error occurs.
If the number of format errors is not zero and the drive has failed, replace the drive. If the counter is not zero
and the drive is OK (has not failed), there may be an intermittent problem that requires drive replacement. If you
observe that the count is increasing over time, replace the drive.
• Hardware Errors—The Hardware Errors counter records the number of times that a physical SCSI drive returned
a Hardware Error status when a SCSI command was attempted. This error status indicates unsuccessful
termination of the SCSI command. The controller typically retries this command several times before failing the
drive.