Owner's manual

that requires drive replacement. If you observe that the count is increasing over time, replace
the drive.
• Self-Test Errors—Indicates if a physical drive failed its self test. The physical drive does a self
test each time the system is turned on.
If the number of self-test 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.
The above information is available for those drives that have been stamped with monitoring and
performance data enabled. The drive was stamped when it left the factory.
Statistics
This section displays statistics about a specific drive array controller physical drive. You can use
the run-time statistics to monitor the health of a specific drive.
The following information displays:
• Sectors Read—Shows the total number of sectors read from the physical drive since the drive
was stamped. The drive was stamped when it left the factory.
• Hard Read Errors—Displays the number of read errors that could not be recovered by a
physical drive's Error Correction Code (ECC) algorithm or through retries. Over time, a drive
may produce these errors. If you receive these errors, a problem may exist with your drive.
The severity of these errors depends on whether the managed system is running in a fault
tolerant mode. With fault tolerance, the controller can remap data to eliminate the problems
caused by these errors.
• Recovered Read Errors—Displays the number of read errors corrected through physical drive
retries. Over time, all drives produce these errors. If you notice a rapid increase in the value
for Recovered Read Errors or Hard Read Errors, a problem may exist with the drive. Expect
more errors for this monitored item than for Hard Read Errors.
• Total Seeks—Displays the total number of seek operations during seek tests performed by the
physical drive since the drive was stamped. The drive was stamped when it left the factory.
During normal reads and writes to the drive, the drive implied seeks to the location where
data resides. These are not included in this count.
• Seek Errors—Displays the number of seek errors that a physical drive detects. A seek error is
a seek that failed. Over time, a drive usually produces these errors. If you notice a rapid
increase in the value shown for Seek Errors, this physical drive may be failing. Only an
unusually rapid increase in these errors indicates a problem.
• Sectors Written—Displays the total number of sectors written to the physical drive since the
drive was stamped. The drive was stamped when it left the factory.
• Hard Write Errors—Displays the number of write errors that could not be recovered by a
physical drive. Over time, a drive may produce these errors. If you notice an increase in the
value shown for Hard Write Errors or Recovered Write Errors, a problem may exist with the
drive. The counter value increases every time the physical drive detects another error. On
average, these errors should occur less frequently than read errors.
• Recovered Write Errors—Displays the number of write errors corrected through physical drive
retries or recovered by a physical drive on a monitored system. Over time, a drive may produce
these errors. If you notice an increase in the value shown for Recovered Write Errors or Hard
Write Errors, a problem may exist with the drive.
The Recovered Write Errors value increases every time the physical drive detects and corrects
an error. Only an unusually rapid increase in these errors indicates a problem. On average,
these errors should occur less frequently than read errors.
50 Agent information