I work with an NFS partition on a mac. Commands like du take a very long time, and I was considering unmounting the NFS and remounting it with noatime and nodirtime. The partitions have been mounted since I started my job, so I don't know if the NFS partition is already mounted with noatime or nodirtime.

How can I tell if a mount has noatime and/or nodirtime enabled?

2 Answers 2


To check which options a partition was mounted with, you can use the mount -l command. This will output a bunch of lines that look like this:

sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)

proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)

I've highlighted the part you should be looking at. Just check the line for the partition you're interested in to see if it says noatime/nodirtime.

  • 2
    Usually mount by itself is enough. Dec 12, 2015 at 11:35
  • The OSX mount manual doesn't mention a -l flag. Is there a way to do this that works in OSX?
    – Dan
    Dec 14, 2015 at 17:36
  • Dan - You should just be able to do mount by itself, and look at the part of the output I mentioned above. The -l flag just tells it to include labels, but isn't actually necessary for what you want to do.
    – J. Taylor
    Dec 15, 2015 at 1:54

In addition to using


you might find additional information looking at the dmesg output.

Note however that you should expect no improvement when running du which will walk down within subdirectories and do a stat on each file (not like df which will return immediately)

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