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  • Cannot stop array: "cannot unmount '/mnt/cache/appdata': pool or dataset is busy"

    • Solved Minor

    Hi there,

    I recently changed my cache drive from btrfs to zfs, and now when I try and stop the array, it gets stuck trying to unmount the disk shares.

    If I try and shutdown the array, it has to force a shutdown.

    I have this in the syslog:

    Jul 12 20:10:33 Percy emhttpd: Unmounting disks...
    Jul 12 20:10:33 Percy emhttpd: shcmd (267285): /usr/sbin/zpool export cache
    Jul 12 20:10:33 Percy root: cannot unmount '/mnt/cache/appdata': pool or dataset is busy
    Jul 12 20:10:33 Percy emhttpd: shcmd (267285): exit status: 1
    Jul 12 20:10:33 Percy emhttpd: Retry unmounting disk share(s)...

    Diagnostics from a previous force shutdown are attached (I have two others - one earlier, and one just now - that I can add too, if need be).


    I have my Dockers mapped to disk shares (including /mnt/cache/appdata/) for performance purposes, so am unsure if it's related to using disk shares rather than the user share.


    Your help is appreciated.


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    Recommended Comments

    Thanks, that command allowed me to stop the array.

    I've just updated to v6.12.3-rc3 and tried stopping the array and it worked without having to issue the command.

    I'll report back if it happens again.

    • Like 1
    Link to comment

    @JorgeB I followed your instructions, diagnosed it with the exact same fault, update but now I'm facing 


    mount: /var/lib/docker: mount(2) system call failed: No such file or directory.


    after the un-mount do I need to re-mount?

    • Upvote 1
    Link to comment
    On 7/26/2023 at 9:30 PM, OliverButler said:

     I followed your instructions, diagnosed it with the exact same fault, update but now I'm facing 

    Please reboot and post new diags after the issue.

    Link to comment

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