What is the maximum number of trunked connections for NFS in ONTAP 9?
Applies to
- ONTAP 9
- NFS
Answer
- There is a limit of 16 connections under any circumstances, either limited by the client or by ONTAP due to the following parameters:
- The number of data LIFs on the ONTAP node that are bound into an failover group for session trunking
- The max_connect number choose on the client side
Example:
- With 8 data LIFs per node in a session trunking failover group, clients could get connections until this number is reached automatically.
- If the client is using
max_connect=4
and ONTAP has 8 data LIFs, then only 4 sessions will be established, because the client is limiting it.
- NetApp's recommendation is to set the client mount parameter always to
max_connect=16
and let the number of possible connections be managed by the definition of a session trunking groups number of DataLIFs.
Note:
- In the above example, the client would get 8 connections only, even if it is set to 16.
- The number of mounting volumes doesn't influence outside of large client scale environments with high workloads consisting of parallel reads and writes from all clients.
Additional Information