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Network Data Management Protocol (NDMP) technology shou…

Network Data Management Protocol (NDMP) technology should be used for backup if:

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A.
a network attached storage (NAS) appliance is required.

B.
the use of TCP/I P must be avoided.

C.
file permissions that can not be handled by legacy backup systems must be backed up.

D.
backup consistency over several related data volumes must be ensured.

Explanation:
NDMP defines three kind of services: a data service that interfaces with the primary storage to be backed up or
restored, a tape service that interfaces with the secondary storage (primarily a tape device), and a translator
service performing translations including multiplexing multiple data streams into one data stream and vice
versa. NDMP services interact with each other. The result of this interaction is the establishment of an NDMP
control session if the session is being used to achieve control for the backup or restore operation. It would
result in an NDMP data session if the session is being used to transfer actual file system or volume data
(including metadata). Control sessions are always TCP/IP-based, but data streams can be TCP/lP-or SANbased. NDMP is more or less NAS-centric and defines a way to back up and restore data from a device, such
as a NAS appliance, on which it is difficult to install a backup software agent, in the absence of NDMP, this data
must be backed up as a shared drive on the LAN, which is accessed via network file protocols, such as
Common Internet File System (CIFS) or Network File System (NFS), degrading backup performance. NDMP
works on a block level for transferring payload data (file content)but metadata and traditional file system
information needs to be handled by legacy backup systems that initiate NDMP data movement. NDMP does not
know about nor takes care of consistency issues regarding related volumes (e.g., a volume to store data


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