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Hard files can be connected either to a SCSI adapter (non-RAID) or a PCI SCSI RAID
adapter. The usage and criteria for a hard file connected to a non-RAID SCSI adapter
are different from those for a hard file connected to a PCI SCSI RAID adapter.
Certify may be used in the following ways:
v Certify Diskette
This selection enables you to verify the data written on a diskette. When you select
this service aid, a menu asks you to select the type of diskette being verified. The
program then reads all of the ID and data fields on the diskette one time and
displays the total number of bad sectors found.
v Certify DVD-RAM media
This selection reads all of the ID and data fields. It checks for bad data and counts
all errors encountered. If an unrecovered error occurs, or recovered errors exceed
the threshold value, the data on the media should be transferred to other media and
the original media should be discarded.
The Certify service aid will display the following information:
– Capacity in bytes
– Number of Data Errors Not Recovered
– Number of Equipment Check Errors
– Number of Recovered Errors
If the drive is reset during a certify operation, the operation is restarted.
If the drive is reset again, the certify operation is terminated and the user is asked to
run diagnostics on the drive.
This task can be run directly from the AIX command line. See the following command
syntax: diag -c -d -T certify
Flag
-c
-d
-T
v Certify Hardfile Attached to a Non-RAID SCSI Adapter
This selection reads all of the ID and data fields. It checks for bad data and counts
all errors encountered. If there are unrecovered data errors that do not exceed the
threshold value, then the hard file needs to be formatted and certified. If the
unrecovered data errors, recovered data errors, recovered and unrecovered
equipment errors exceed the threshold values, the disk needs to be replaced.
It also makes 2000 random seeks after the read certify of the surface completes. If a
disk timeouts before finishing the random seeks, then the disk needs to be replaced.
The random seeks also count all errors encountered.
The Certify service aid will display the following information:
– Drive capacity in megabytes.
– Number of Data Errors Recovered.
– Number of Data Errors Not Recovered.
– Number of Equipment Checks Recovered.
104
User's Guide
Description
No console mode
Specifies a device
Specifies the certify task
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