Initializing HDR with an External Backup and Restore

You can use external backups to initialize High-Availability Data Replication (HDR).

To initialize HDR with an external backup and restore

Block the source database server with the following command:
```
onmode -c block
```
Externally back up all chunks on the source database server.
When the backup completes, unblock the source database server:
```
onmode -c unblock
```
Make the source database server the primary server:
```
onmode -d primary secondary_servername
```
On the target database server, restore the data from the external backup with a copy or file-backup program.
On the target database server, restore the external backup of all chunks:
```
ontape -p -e
```
Make the target database server the secondary server:
```
onmode -d secondary primary_servername
```
If the logical-log records written to the primary database server since step 1 still reside on the primary database server disk, the secondary database server reads these records to perform the logical recovery. Otherwise, perform the logical recovery:
```
ontape -l
```
The database server operational messages appear in the message log on the primary and secondary servers.