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I'm running native ZFS on Ubuntu 11.10 with 2x2 TB drives in a mirrored setup. The ZFS file system is mounted directly in Ubuntu and not through NFS or something like that, the permissions are set too 777.

My problem is that when I delete a file it would disappear as you'd expect but when I type zfs list it's still reporting used space as if the file was still there. I've wait a couple of hours and I'm currently running a scrub to see if that fixes it but that shouldn't be necessary, should it?

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Got any snaps in place? – Chopper3 Nov 16 '11 at 13:16
Yeah,… seems to cover it. – David Bullock Nov 16 '11 at 14:03
No, I don't have any snapshots or compression on that particular dataset but I've found the solution so I'll answer my own question. Thank you for your help though! – knorrhane Nov 16 '11 at 15:26
up vote 2 down vote accepted

The answer is pretty ridiculous I guess; it turned out that Ubuntu moved the files to .Trash1000 but wouldn't allow the Recycle Bin to empty the .trash-folders on my ZFS datasets. I'm guessing this is a permissions issue or something since my ZFS datasets are mounted with root and then I ran chmod 777 on all of them to allow for my user to use them.

Anyways, deleting the .Trash1000 folder fixed the "problem".

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Please accept this answer when you are able – Iain Nov 17 '11 at 9:44
chmod 777: nonononono! Never ever run chmod 777. It is practically never required! Not even for "testing purposes". If the file is readable, then it's readable. If it's writable by the user or group that need to write to it, then it's writable. There is absolutely zero need to give everyone write permissions, and forgetting to chmod it back to something sane is exactly how multinationals get hacked. Just don't do it. Ever. I wrote an introduction of Unix permissions. Please read it! – Carpetsmoker Mar 13 at 6:01

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