I got the following messages today when I inspected my ZFS:
errors: Permanent errors have been detected in the following files:
/mypool/data/file1.dat
/mypool/data/file2.dat
/mypool/data/file3.dat
/mypool/data/file4.dat
/mypool/data/file5.dat
As usual, the first thing I did was to scrub the entire pool, i.e.,
sudo zpool scrub mypool
Unfortunately, it didn’t work. The error still existed even there was no checksum error.
Keep in mind that this tutorial is about removing the error message, it is not about rescuing your files. ZFS is not 100% fail proof. It is highly recommended to have a backup copy if the data is important.
Since I don’t care about the file (backup copy), I decided to delete the files manually, and it ended up like this:
errors: Permanent errors have been detected in the following files:
mypool/data:<0x1fa3a>
mypool/data:<0x1fa45>
mypool/data:<0x1fa46>
mypool/data:<0x1f354>
mypool/data:<0x1f664>
That’s because when the files were deleted, it simply removed the file pointers. Since ZFS no longer has the file names, it decided to report the location instead. To solve this problem, you will need to go through the following:
First, make sure that you have no checksum error and the pool is healthy, i.e., all hard drives are online, and all counts are zero.
sudo zpool status mypool
Next, try to scrub the pool again:
sudo zpool scrub mypool
Within a minute, try to stop the process:
sudo zpool scrub -s mypool
Check the status again. The error should be gone:
sudo zpool status -v pool: mypool state: ONLINE scan: scrub canceled on Sun Feb 3 12:18:06 2019 errors: No known data errors
If the error still presents, you may need to scrub the pool again.
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