Use the BRBACKUP tool through Splitint interface on the proxy server instead of production server with either an online_mirror or offline_mirror for performing split-mirror disk backups. Use the util_file interface to perform these backups.
Procedure
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Use the following BRBACKUP command to perform split-mirror disk backups with online_mirror using util_file interface:
brbackup -d $[util_file] -t $[online_mirror] -m $[all] -c -
Use the following BRBACKUP command to perform split-mirror disk backups with offline_mirror using util_file interface:
brbackup -d $[util_file] -t $[offline_mirror] -m $[all] -c