Chapter 7. Migration to JFS

7.1 Using a Backup and Restore Program

As described above, one way to migrate data from HPFS to JFS is to backup the data, redefine the drive(s) to be formatted to JFS, and then restore the data. This assumes that the drive letters do not change, and if they do, the applications using the data can still access it somehow.

A production server usually has a backup device directly attached to the system or is using a mechanism, such as ADSM, to backup to a centralized server. Both options can be used to migrate a volume to JFS. Depending on the size of your hard disks, this might be the only option that is available to you.

The Backup and Recovery Services feature of OS/2 Warp Server for e-business can also backup to a remote drive over the LAN assuming the drive is shared using NET SHARE on the remote server. If you did not originally install this service, you can restart the Installation program to select the Backup and Recovery Services component.

Here are the basic steps for completing an in-place migration of data from HPFS to JFS.

1. Backup the HPFS drive using your normal backup method. In our example, we used the Backup and Restore function to backup the data on our D: drive (HPFS) to a hard disk from another system on the LAN as shown in Figure 134.
   
   
   
   Figure 134: OS/2 Warp Server Backup and Restore Method Definition
   
   

2. After the backup completes, the administrator should verify the success by checking the log files generated by the backup program. Once this is done, proceed to the next step.

3. Delete the HPFS drive and redefine it as a JFS volume. In our example, we deleted the D: drive associated with our HPFS data drive. We redefined it as an LVM volume with the same drive letter and same size.

4. When formatting the new JFS volume, execute a long format. In our example, we entered format d: /fs:jfs /l. Note that we did not need to reboot the system to format the new drive.

5. The next step is to restore the data to the newly-created JFS volume. In our example, we used the Backup and Restore program to do this copying data from the LAN drive back to the D: drive.

6. Verify the data restored to the new drive. In our example, we verified that the data (number of files, total file size) was identical compared to the data backed up in step 1.

7.2 Adding Disk Space