IBM 6C4 - Manual (Page 128)

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, the hard file must 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.
The Certify service aid also makes 2000 random seeks after the read certify of the
surface completes. If a disk times out before finishing the random seeks, 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
– Number of Equipment Checks Not Recovered
This task can be run directly from the AIX command line. See the following command
syntax:
diag -c -d deviceName -T "certify"
Flag Description
-c No console mode
-d Specifies a device
-T Specifies the certify task
v Format and/or Erase Hardfile Attached to a Non-RAID SCSI Adapter
Attention: The following commands will change the content of the hardfile. Be sure
to back up data prior to running the command, and take care in choosing the hardfile
upon which you run this task.
– Hardfile Format
Writes all of the disk. The pattern written on the disk is device-dependent; for
example, some drives may write all 0s, while some may write the hexadecimal
number 5F. No bad-block reassignment occurs.
– Hardfile Format and Certify
Performs the same function as Hardfile Format. After the format is completed,
Certify is run. Certify then reassigns all bad blocks encountered.
– Hardfile Erase Disk
This option can be used to overwrite (remove) all data currently stored in
user-accessible blocks of the disk. The Erase Disk option writes one or more
patterns to the disk. An additional option allows data in a selectable block to be
read and displayed on the system console.
110 pSeries 630 Model 6C4 and Model 6E4 User’s Guide