Dell EMC Unity: How to use and manage NDMP (User Correctable)

Unity supports 3-way NDMP backups and 2-way direct-attached backups (2-way backups requires Unity OE 4.4 or later). 

3-Way NDMP
3-way backups involve:

• An NDMP backup client running qualified software
• An NDMP data server that reads data from the storage system and produces the data stream for backup
• A server running the tape service (reads the data stream and writes it to tape)
• In a 3-way backup, both file system and control data travel across the network, but this network can be dedicated.
• Supports backups of File data using Data Domain, Avamar, and so on. 

NDMP backups have been updated to back up new UFS64 metadata timestamps, GUID, NFSv4 ACL structures (atime; mtime; ctime; cvtime; btime; vctime; bctime). 

NMDP backups are new format and cannot restore legacy backups containing deduplicated data to UFS64 file systems:

• UFS64 backups can back up ufs32 or ufs64 file systems 
• Can restore legacy backups to ufs32 or ufs64, but new ufs64 backups can only be restored to ufs64 
• Cannot restore legacy deduped files to UFS64 
• New server_param to disable IPv6, if necessary 
• Latest file timestamps are based on BASE_DATE instead of creation date 

Improved support for Dense files:

• Max NDMP Concurrent Sessions: Unity 300-500=8 Unity 600=20 2-Way NDMP 
• Backup traffic is transferred directly from the Unity primary storage system to the Traditional LUN (TLU) using a zoned Fibre Channel (FC) connection.
• Requires a Unity system running Operating Environment 4.4 or later

The following KB article gives more information about the requirements, limitations and how to configure NDMP for Unity systems:
Deployment KB: Unity - How to configure NDMP backup in Unity