NDMP three-way backup
If you use the NDMP three-way backup, the NetBackup for NDMP server initiates the backup. Data travels over the network by going from an NDMP host to a storage device that is attached to another NDMP host on the local network or is available on a SAN.
The following figure shows an example of an NDMP three-way backup and restore.
Note:
In an IPv4 environment, if you attempt an NDMP three-way backup using NAS filers that are configured to use IPv6, the backup fails with the error, too many datablocks. The error occurs when you run the backup to a tape drive that is attached to a NAS filer that is configured for IPv6.
To avoid this issue, add the entry: NDMP_IPV6_DISABLE in the /db/config/ndmp.cfg file to tell NetBackup that IPv6 is not to be used.