What is NCONNECT? Linux has a feature called “nconnect” that enables multiple TCP connections for a single NFS mount. The nconnect mount option exists in all Linux distributions with kernel 5.3 or higher and can be used with NFS v2, v3, and all v4.x variants. It should be set to a number from 1 to 16 (inclusive). The nconnect option allows the user to specify the number of connections that should be established between the client and server up to a limit of 16.
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How nconnect works: nconnect works by opening multiple NFS sessions between the client and server. nconnect supports multiple TCP connections to the same NFS server for the same IP address at the server end. Opening multiple data paths between the client and server.
To use nconnect – it’s as simple as adding the following to your client mount options: nconnect=<value> Usage: nconnect=<value> should be set to a number from 1 to 16 (inclusive). This will set the number of TCP connections which the client will form between itself and the NFS server, to handle all NFS work for that version of the NFS protocol. (This setting will only take effect during the clients first mount for that NFS server. (note if the option is not specified during the first mount to that server, it’s assumed nconnect=1. nconnect man page
mount -t nfs -o ro,nconnect=16 198.18.0.100:/datasets /mnt/datasets
Emily Potyraj has a excellent article around nconnect on medium.com.
Conclusion
Do you want to super charge your NFS?
Do you want to be SUPERMAN?
Use nconnect with all your Linux NFS mounts.
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