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My cache is no longer mountable

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Hi all

 

I'm in version 6.12.0-rc6 and plugins etc are updated. I've just noticed that my 3 cache drives which are formatted btrfs are unmountable and unRAID is telling me to format, but I have stuff on them. 

 

Is this because with all the recent updates I need to select something so the btrfs drives are recognised?

 

I don't really know what to do next coz all was working fine a couple days ago and it's only changed due to the updates. Any help will be much appreciated. 

Solved by JorgeB

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  • Community Expert
  • Solution

Try this, if the log tree is the only problem it may help:

 

btrfs rescue zero-log /dev/nvme1n1p1

 

  • Author
17 hours ago, JorgeB said:

Try this, if the log tree is the only problem it may help:

 

btrfs rescue zero-log /dev/nvme1n1p1

 

This fixed it! Thanks for your help!

 

If you get a spare moment, would you be able to explain how you found the problem? 

 

Should I change the btrfs file system to something else?

  • Community Expert

The log shows that the log tree failed be read.

 

6 hours ago, HomerJ said:

Should I change the btrfs file system to something else?

Usually something else causes this issue, not directly btrfs related, but you can try a different fs if you prefer, also note that this issue tends to re-occur, if it does would recommend re-formatting the fs.

 

  • Author
16 hours ago, JorgeB said:

The log shows that the log tree failed be read.

 

Usually something else causes this issue, not directly btrfs related, but you can try a different fs if you prefer, also note that this issue tends to re-occur, if it does would recommend re-formatting the fs.

 

Thank you so much for your help!

 

If I change file systems, which do you think I should choose? NB it's cache. 

  • Community Expert

I assume current pool is raid1 with the 3 devices?

  • Author
On 5/27/2023 at 6:02 PM, JorgeB said:

I assume current pool is raid1 with the 3 devices?

Yes

  • Community Expert

For multi device pools you can use btrfs or zfs, so you could change to zfs, but note that there's no 3 device raid1 option with zfs, you can have 2 or 4 devices in raid1, with 3 devices you can only make a 3-way mirror.

  • 6 months later...
  • Author
On 5/25/2023 at 6:02 PM, JorgeB said:

Try this, if the log tree is the only problem it may help:

 

btrfs rescue zero-log /dev/nvme1n1p1

 

G'day again!

 

I've had this issue occur a few times since it first happened, and this solution has fixed it each time. But what would actually cause this to happen?

  • Community Expert

If it keeps happening I would recommend to backup and reformat the pool.

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