"Unmountable disk present" -- SOLVED

[babis2k]

Hi all,

 

I recently upgraded my unRAID server to 6.8.2 and I noticed that I have an "Unmountable disk present" and cache disk won't mount. I have a cache pool with 2 SSDs and one disc log information says:

Jan 28 10:31:53 Storage kernel: sd 1:0:1:0: [sdc] 468862128 512-byte logical blocks: (240 GB/224 GiB)
Jan 28 10:31:53 Storage kernel: sd 1:0:1:0: [sdc] Write Protect is off
Jan 28 10:31:53 Storage kernel: sd 1:0:1:0: [sdc] Mode Sense: 7f 00 10 08
Jan 28 10:31:53 Storage kernel: sd 1:0:1:0: [sdc] Write cache: enabled, read cache: enabled, supports DPO and FUA
Jan 28 10:31:53 Storage kernel: sdc: sdc1
Jan 28 10:31:53 Storage kernel: sd 1:0:1:0: [sdc] Attached SCSI disk
Jan 28 10:31:53 Storage kernel: BTRFS: device fsid eccfaaa2-5017-4960-9d5b-d1a07443a421 devid 1 transid 11830033 /dev/sdc1
Jan 28 10:32:05 Storage emhttpd: KINGSTON_SA400S37240G_50026B76827CCB3E (sdc) 512 468862128
Jan 28 10:32:06 Storage emhttpd: import 30 cache device: (sdc) KINGSTON_SA400S37240G_50026B76827CCB3E
Jan 28 10:32:13 Storage kernel: BTRFS info (device sdc1): disk space caching is enabled
Jan 28 10:32:13 Storage kernel: BTRFS info (device sdc1): has skinny extents
Jan 28 10:32:13 Storage kernel: BTRFS info (device sdc1): enabling ssd optimizations
Jan 28 10:32:13 Storage kernel: BTRFS warning (device sdc1): sdc1 checksum verify failed on 55373398016 wanted 9086B0CB found 48F5F7D4 level 0
Jan 28 10:32:13 Storage kernel: BTRFS error (device sdc1): bad tree block start, want 55373414400 have 1222961048758584978
Jan 28 10:32:13 Storage kernel: BTRFS error (device sdc1): Error removing orphan entry, stopping orphan cleanup
Jan 28 10:32:13 Storage kernel: BTRFS error (device sdc1): could not do orphan cleanup -22
Jan 28 10:32:13 Storage root: mount: /mnt/cache: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error.
Jan 28 10:32:13 Storage kernel: BTRFS error (device sdc1): open_ctree failed

 

All the SMART data says that nothing is wrong however a parity check completed 31/12 returned with "0 errors" (I don't know if this is related or not).

How can I fix it?

 

Thanks in advance.

storage-diagnostics-20200129-0948.zip

[JorgeB]

Cache filesystem is corrupt, best bet it to re-format, if there's any important data there you can try these recovery options.

[babis2k]

Thank you very much for your reply.

After I post it I found this very useful FAQ of yours and I managed to mount cache drive and I proceed with copying cache data to the array.

 

By the way what do you think, is it a good advice for appdata, domains and system shares to use Prefer setting for cache pool?

[JorgeB]

"prefer" or "no" (assuming all data on those shares is already on cache)

[babis2k]

Right now all these shares are on the array.

So you mean that I must copy them to the cache pool before enable Prefer option?

[JorgeB]

You can enable "prefer" and then run the mover (docker and VM services need to be stopped first), once the mover finishes you can change to cache="no", but it can also be left as "prefer", enable GUI help for a detailed explanations of the differences.

[babis2k]

Thank very much.

 

[itimpi]

1 hour ago, johnnie.black said:

You can enable "prefer" and then run the mover (docker and VM services need to be stopped first), once the mover finishes you can change to cache="no", but it can also be left as "prefer", enable GUI help for a detailed explanations of the differences.

What is the rationale for using Cache=No rather than Cache=Only once mover has completed?

[JorgeB]

11 minutes ago, itimpi said:

What is the rationale for using Cache=No rather than Cache=Only once mover has completed?

I meant cache="only"

[itimpi]

Just now, johnnie.black said:

I meant cache="only"

Fair enough - I get days like that as well     I was just wondering if there was something profound that I had missed

[Rattus]

On 1/29/2020 at 8:17 PM, babis2k said:

Thank you very much for your reply.

After I post it I found this very useful FAQ of yours and I managed to mount cache drive and I proceed with copying cache data to the array.

 

By the way what do you think, is it a good advice for appdata, domains and system shares to use Prefer setting for cache pool?

Hey guys, So I've just run into the same problem as you, I know this was a while ago for you but if you can remember what you did could you please share? I was hoping that you linked to the FAQ you mentioned but it's not there.

Thanks heaps!

[JorgeB]

19 minutes ago, Rattus said:

I was hoping that you linked to the FAQ you mentioned but it's not there.

It is:

 

On 1/29/2020 at 9:03 AM, JorgeB said:

you can try these recovery options.

 

[babis2k]

23 minutes ago, Rattus said:

Hey guys, So I've just run into the same problem as you, I know this was a while ago for you but if you can remember what you did could you please share? I was hoping that you linked to the FAQ you mentioned but it's not there.

Thanks heaps!

 

I've marked the above post as the "Solution" for my problem.

[Rattus]

Thanks for that guys, sorry to be so nieve, i guess i was just panicking. I've started a new issue so that I don't clutter this one.

 

 

Any chance of getting some help? I've put in the post the terminal commands and outputs.

 

Thanks again guys, last post here.

[robertomano24_24]

On 1/29/2020 at 4:03 AM, JorgeB said:

you can try these recovery options.

Are there similar options for an encrypted BTRFS drive?

 

Getting the error:

root@Unraid:~# mount -o rescue=all,ro /dev/sdb1 /temp
mount: /temp: unknown filesystem type 'crypto_LUKS'

 

Edited July 3, 2022 by robertomano24_24

[JorgeB]

4 hours ago, robertomano24_24 said:

Are there similar options for an encrypted BTRFS drive?

First you must decrypt the device, then it's the same just add mapper to the device path, e.g.:

 

mount -o rescue=all,ro /dev/mapper/sdb1 /temp