Recommended NFS Mount Options

IN THIS ARTICLE

Outlines the recommended NFS mount options for both Mac and Linux

REQUIREMENTS

• Cluster running Qumulo Core

NOTE: Qumulo currently only supports NFSv3 protocol for the following recommended NFS mount options.

OVERVIEW

• The combination of the mount options intr (Interrupt) and hard (Hard Mount) provide the best balance of data integrity and client stability in the event of a client disconnection from the server.
• The tcp option ensures that TCP is used during the mount phase and data transfer, greatly speeding up mount times in some environments.
  • Qumulo does not support NFS traffic over UDP 
• With modern Linux distributions, there is no need to specify most NFS mount options as the client will auto-negotiate the mount string with the server, including setting up a 1MB send/receive block size.
• READDIRPLUS, specified via the rdirplus mount option, allows more aggressive polling of metadata from directories and can greatly improve the performance of directory listing and "ls" operations on Macs.
  • This is a default option on modern Linux distros
• The Local Locks options listed below are provided for compatibility client software that requires some form of positive file locking but the use of NLM file locking is not desired. 

DETAILS

Verify Current NFS Mount Options

Run the following command on the client to list your current NFS mount options being used for all NFS mounts:

nfsstat -m

Recommended Mount Options

Mac Client

mount -t nfs -o rsize=65536,wsize=65536,intr,hard,tcp,rdirplus,readahead=128 your.qumulo.ip:/share /path/to/mountpoint

Mac Client with Local Locking Enforced

mount -t nfs -o rsize=65536,wsize=65536,intr,hard,tcp,locallocks,rdirplus,readahead=128 your.qumulo.ip:/share /path/to/mountpoint

Linux Client 

• Please note that modern Linux distributions auto negotiate a 1MB read/write block size (rsize/wsize of rsize=1048576).

mount -t nfs -o intr,hard,tcp your.qumulo.ip:/share /path/to/mountpoint

Linux Client with Local Locks Enforced

mount -t nfs -o intr,hard,tcp,local_lock=all your.qumulo.ip:/share /path/to/mountpoint

RESOLUTION

You should now know the recommended mount options when mounting a Qumulo cluster from a Mac or Linux client over NFS

ADDITIONAL RESOURCES

QQ CLI: NFS Exports

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