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Error Counts
The controller maintains several error count tables of disk errors that are
encountered during normal operation. Error Count Tables can be used to monitor
the health of a device and to indicate when a device needs to be repaired or
replaced.
To view the error counts for a device:
1
Select Error Counts from the Tools menu. The software displays the Examine
Error Counts screen, with the first drive highlighted.
2
Select the target drive you want to examine.
The software will display the Error Counts window, which shows the
following information:
•
Channel and target.
•
Parity errors – a count of the SCSI bus parity errors that occurred
while this device was transferring information on the bus.
•
Soft errors – a count of CHECK CONDITION errors reported by the
device. These errors are typically generated when a bad sector on the
disk is encountered. Such errors are recovered by the controller (if the
device is part of a redundant system drive) by generating the data from
the remaining disks. The bad sector on the device is also eliminated by
writing back the data onto the disk and reading to verify, since a verify
failure results in the reassignment of data to a different sector. Soft
errors may occur during normal operation if the device has bad sectors.
•
Hard errors – a count of hardware errors on the device. During normal
operation, the hard error count for any device should be zero. The
following conditions cause the hardware error count to be incremented
for a device:
- SIOP interrupt for "Illegal instruction detected"
- SIOP interrupt for "Gross error"
- SCSI device executed illegal/unsupported phase sequence
Maintenance
103
Error Counts
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