Disk recovery in cross-domain replication DR environment
If the disk technology being used does not support Auto Image Replication, an alternative approach is simply to replicate the entire storage and then use a combination of catalog recovery and the nbcatsync utility to populate the catalog at the disaster recovery location.
The nbcatsync utility facilitates replication even if disk media IDs recorded at the EMM database and at the metadata component of the image database are different. The nbcatsync utility aligns the disk media IDs in the image database metadata with the media IDs in the disaster recovery domain's EMM database. The regular backups and catalog backups that are made at the production site are written to the replicating disk storage. The catalog backup's disaster recovery file is sent to the disaster recovery domain.
The nbcatsync utility is supported on all master server platforms. You can use it with all Advanced Disk types supported by NetBackup.
To recover disk in a cross-domain replication environment in the event of a disaster, perform the following steps on the DR domain's master server:
- Align the disk media ID information in the catalog backup's DR file with the disk media ID information in the DR domain's EMM database. For this, run the following command:
nbcatsync -sync_dr_file <DR file name>
- Perform a partial catalog recovery from the replicated catalog backup by running the command,
bprecover -wizard
- Run the command cat_export - all - staging to export the metadata from the replicated relational database backup.
- Run the command cat_import - all to import the exported metadata into the active relational database.
- Align the disk media IDs associated with the image records recovered by the partial catalog recovery with the disk media IDs present in the DR domain. For this, run the command
nbcatsync -backupid <restored catalog backup ID>