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Disk Maintenance Service Aid
There are two kinds of disk maintenance service aids:
Disk to Disk Copy Service Aid
Display/Alter Sector Service Aid
Disk to Disk Copy Service Aid
The service aid allows you to recover data from an old drive when replacing it with a
new drive. The service aid only supports copying from a drive to another drive of
similar size; it cannot be used to update a different size drive. The migratepv
command should be used when updating drives. The service aid recovers all LVM
software reassigned blocks. To prevent corrupted data from being copied to the new
drive, the service aid aborts if an unrecoverable read error is detected. To help
prevent possible problems with the new drive, the service aid aborts if the number of
bad blocks being reassigned reaches a threshold.
The procedure for using this service aid requires that both the old and new disks be
installed in or attached to the system with unique SCSI addresses. This requires
that the new disk drive SCSI address must be set to an address that is not currently
being used and the drive be installed in an empty location. If there are no empty
locations, one of the other drives can be temporarily removed. Once the disk copy is
complete, either remove the target drive to return to the original configuration, or
perform the following procedure to complete the replacement of the old drive with the
new drive:
1. Remove both drives.
2. Set the SCSI address of the new drive to the SCSI address of the old drive.
3. Install the new drive in the old drive's location.
4. Install any other drives that were removed into their original location.
To prevent problems that may occur when running this service aid from disk, run this
service aid from diagnostics loaded from removable media.
7-12 RS/6000 Enterprise Server Model H Series User's Guide