Owner's manual

• Hard Write Errors—Displays the number of write errors that could not be recovered by physical
drive retries. These errors are counted over the time listed in the Service Hours item in the SCSI
Physical Drive section. Over time, a drive might produce these errors. These errors are usually
caused by bad media sections on the drive.
When a hard write error occurs, the physical drive remaps the bad sector. If the physical drive
attempt to remap the sector is unsuccessful, NetWare Hot Fix Redirection logic attempts to
remap the sector. Windows NT hot fixes bad sectors on HPFS and NTFS file systems.
• Recovered Read Errors—Displays the number of read errors corrected through physical drive
retries or other drive recovery mechanisms. Over time, all drives produce these errors. The
number of errors is counted over the time shown in the Service Hours item in the SCSI Physical
Drive section.
Having a large number of retry corrected errors does not necessarily indicate that the drive
is failing. However, as a precaution, you can replace a drive that has an abnormally high
amount of errors when compared to similar drives. If the number of errors increases rapidly,
you might need to replace the drive.
• Recovered Write Errors—Displays the number of write errors corrected through physical drive
retries or other drive recovery mechanisms. Over time, all drives produce these errors. The
number of errors is counted from the time shown in the Service Hours item in the SCSI Physical
Drive section.
Having a large number of retry corrected errors does not necessarily indicate that the drive
is failing. However, as a precaution, you might wish to replace a drive that has an abnormally
high amount of errors when compared to similar drives. If this count increases rapidly, you
might need to replace the drive.
• Seek Errors—Displays the number of seek errors that a physical drive detects. A seek error is
a seek that failed. The number of errors is counted over the time shown in the Service Hours
item in the SCSI Physical Drive section.
Seek errors occasionally occur. Having a large number of seek errors does not necessarily
indicate that the drive is failing. However, as a precaution, you might wish to replace a drive
that has an abnormally high amount of errors when compared to similar drives. If this count
increases rapidly, you might need to replace the drive.
• ECC Corr Reads—Displays the number of times the drive used the ECC algorithm to recover
data for read requests. The number of errors is counted over the time listed in the Service
Hours item in the SCSI Physical Drive section.
ECC-corrected reads occasionally occur over time. Having a large number of ECC-corrected
errors does not necessarily indicate that the drive is failing. However, if a particular drive has
an abnormally high amount of ECC-corrected reads compared to similar drives, you might
replace the drive as a precaution. If this count increases rapidly, you might replace the drive.
Statistics Preserved
Indicates if and how physical drive statistics are preserved over a power cycle. The following
values are valid:
• Preserved In NVRAM—The statistics are saved in non-volatile memory on the computer system.
• Preserved On Disk—The statistics are saved on the disk drive.
• Not Preserved - No CPU Support—The statistics are not saved across power cycles because
the hardware does not support this operation.
• Not Preserved - No Free NVRAM—The statistics are not saved across power cycles because
all of the available non-volatile memory is in use.
92 Agent information