NetWorker NDMP DSA performance

We try to backup Celerra VG2 using NetWorker NDMP.  From existing hardware, we decide to use NDMP DSA since we don't have license for VTL on DataDomain.  We backup 4 streams together and the total throughput is 30 - 40 MB/s.

(To find out backup performance on Celerra, logon to control station and run the following command: assuming you are backing up filesystem on Data Mover server_2)
server_pax server_2 -s -v

We contact support and they suggest us to use the -P option for the backup command where sn is the storage node you want the backup data sent to.

nsrndmp_save -T dump -M -P sn

We also list only the sn in the storage node field on the client properties of the Celerra in NetWorker.

After making the changes, we see performance improve to 100 MB/s.

Keep in mind, if you are running pure NDMP backup (that is, having a FC tape drive connected to Celerra Data Mover), the backup command will be

nsrndmp_save -T dump

i.e. For most NAS, dump is the only option supported.  Please refer to NetWorker and Celerra documentation for more info.
-M option is for DSA backup.
For pure NDMP, do not add -M in the backup command.