Jump to content

  • ZFS - atime on by default, disable?

    samsausages

    By samsausages

      • Solved Minor

    Noticing that Unraid enables atime by default on zfs pools/datasets.  Most of my workloads do not need atime on, so I usually disable it on my datasets.  I have a feeling you all have already had this discussion, but I couldn't find any posts referencing atime, so I thought I'd bring it up.
    I would like to be able to default it to off, or have a way to disable it.  Right now I just send the command via CLI, but this doesn't work well for folders/datasets that are cached, as they are created and destroyed depending on usage.
    (would also be nice to do the same for recordsize, but I have read that will be introduced at some point)

    Go to reports Prereleases

    User Feedback

    Recommended Comments

    JorgeB

    All filesystems mounted by Unraid, including zfs, are mounted with the noatime option, so it should always be disabled:

      

    May 11 09:27:10 Tower7 emhttpd: shcmd (77): /usr/sbin/zfs mount -o noatime cache

     

    Link to comment
    samsausages
    1 hour ago, JorgeB said:

    All filesystems mounted by Unraid, including zfs, are mounted with the noatime option, so it should always be disabled:

      

    May 11 09:27:10 Tower7 emhttpd: shcmd (77): /usr/sbin/zfs mount -o noatime cache

     


    I just created a test share (dataset) on a pool using the Unraid "shares" GUI, set to the zfs pool exclusively.  This is the result for "zfs get atime" for the newly created dataset.

    image.png.0e4eb248ff4c55e08256e1c2c2372897.png

    When I check the log to see how the pool is mounted at array start, I can confirm that the pool is mounting with 'noatime', as follows:
     

    Quote

    May 11 06:23:08 bertha emhttpd: shcmd (7997749): /usr/sbin/zfs mount -o noatime workpool


    But the datasets I create using Unraid do show atime=on for the dataset itself.

    Link to comment
    JorgeB

    Yeah, after replying was doing some Googling and looks like there's an issue where zfs does not respect the -noatime mount option, I'm going to bring this to LT's attention.

    • Like 1
    Link to comment


    Join the conversation

    You can post now and register later. If you have an account, sign in now to post with your account.
    Note: Your post will require moderator approval before it will be visible.

    Guest
    Add a comment...

    ×   Pasted as rich text.   Restore formatting

      Only 75 emoji are allowed.

    ×   Your link has been automatically embedded.   Display as a link instead

    ×   Your previous content has been restored.   Clear editor

    ×   You cannot paste images directly. Upload or insert images from URL.

    ×

  • Status Definitions

     

    Open = Under consideration.

     

    Solved = The issue has been resolved.

     

    Solved version = The issue has been resolved in the indicated release version.

     

    Closed = Feedback or opinion better posted on our forum for discussion. Also for reports we cannot reproduce or need more information. In this case just add a comment and we will review it again.

     

    Retest = Please retest in latest release.

    Priority Definitions

     

    Minor = Something not working correctly.

     

    Urgent = Server crash, data loss, or other showstopper.

     

    Annoyance = Doesn't affect functionality but should be fixed.

     

    Other = Announcement or other non-issue.

×
×
  • Create New...