NFSv3 versus NSD exports in AFM DR
The primary accesses the secondary fileset by using either NFSv3 or NSD protocol.
Features of NFSv3
NFSv3 is a stateless protocol, which is resilient on low-bandwidth and high-latency networks.
Advantages of NFSv3
It is recommended to use NFSv3 because NFSv3 is more tolerant when deployed on an unstable or
high-latency network.
Note: It is recommended to use the NSD protocol only if the NFS protocol does
not meet the expected performance requirements.
Limitations of NFSv3
For parallel I/O to work by using NFSv3, create a map between the gateway nodes in the primary to the NFS servers in the secondary. For more information about parallel I/O configuration, see Configuration parameters for AFM, AFM-DR, and AFM to cloud object storage.
Features of NSD
The NSD protocol is sensitive to packet drops and network latency.
Advantages of NSD
NSD provides high performance to LAN-based installations.
Limitations of NSD
If the secondary cluster is inaccessible, the NSD mount hangs, which in turn might cause the application to hang on the primary cluster.