Unmountable Disk Present

[mhn_10]

Server was working perfectly fine. Now it shows 'Unmountable disk present'. I believe 1 cache disk and 1 data disk are having issues.
Data disk 2 is showing as not installed.
Have only tried reboot till now. Didn't want to break anything by trying other stuff

unmhn-diagnostics-20231218-1645.zip

[JorgeB]

There's a missing pool device, try checking/replacing cables.

[mhn_10]

I disconnected and reconnected all the cables. Seems to have solved the cache pool ssd issue. But 1 disk is unable to mount. unmhn-diagnostics-20231228-0003.zip

[itimpi]

Handling of unmountable array disks is covered here in the online documentation accessible via the Manual link at the bottom of the Unraid GUI.  In addition every forum page has a DOCS link at the top and a Documentation link at the bottom.

[mhn_10]

Thanks for the reference doc. I was following it. I successfully checked and repaired the drive. The following was the output

 

After Checking

 

Phase 1 - find and verify superblock...
Phase 2 - using internal log
        - zero log...
        - scan filesystem freespace and inode maps...
        - found root inode chunk
Phase 3 - for each AG...
        - scan (but don't clear) agi unlinked lists...
        - process known inodes and perform inode discovery...
        - agno = 0
        - agno = 1
        - agno = 2
        - agno = 3
        - agno = 4
        - agno = 5
        - agno = 6
        - agno = 7
        - agno = 8
        - agno = 9
        - process newly discovered inodes...
Phase 4 - check for duplicate blocks...
        - setting up duplicate extent list...
        - check for inodes claiming duplicate blocks...
        - agno = 0
        - agno = 5
        - agno = 1
        - agno = 6
        - agno = 2
        - agno = 7
        - agno = 4
        - agno = 3
        - agno = 8
        - agno = 9
No modify flag set, skipping phase 5
Phase 6 - check inode connectivity...
        - traversing filesystem ...
        - traversal finished ...
        - moving disconnected inodes to lost+found ...
Phase 7 - verify link counts...
No modify flag set, skipping filesystem flush and exiting.

 

 

After repairing with `-L` option

 

Phase 1 - find and verify superblock...
Phase 2 - using internal log
        - zero log...
        - scan filesystem freespace and inode maps...
        - found root inode chunk
Phase 3 - for each AG...
        - scan and clear agi unlinked lists...
        - process known inodes and perform inode discovery...
        - agno = 0
        - agno = 1
        - agno = 2
        - agno = 3
        - agno = 4
        - agno = 5
        - agno = 6
        - agno = 7
        - agno = 8
        - agno = 9
        - process newly discovered inodes...
Phase 4 - check for duplicate blocks...
        - setting up duplicate extent list...
        - check for inodes claiming duplicate blocks...
        - agno = 0
        - agno = 6
        - agno = 3
        - agno = 4
        - agno = 2
        - agno = 5
        - agno = 7
        - agno = 1
        - agno = 8
        - agno = 9
Phase 5 - rebuild AG headers and trees...
        - reset superblock...
Phase 6 - check inode connectivity...
        - resetting contents of realtime bitmap and summary inodes
        - traversing filesystem ...
        - traversal finished ...
        - moving disconnected inodes to lost+found ...
Phase 7 - verify and correct link counts...
Maximum metadata LSN (1:2452269) is ahead of log (1:2).
Format log to cycle 4.
done

 

 

Since I didn't see any errors, I stopped the array, and started in normal mode.
Now its showing `Parity-Sync/Data-Rebuild in progress.` . I hope its the right thing

[itimpi]

Looks like you successfully repaired the emulated disk2 (which was disabled), and the system is now rebuilding the contents of that emulated disk onto the physical disk2..

[mhn_10]

Not sure what happened, but my disk 2 has gone back to being disabled and emulated.

I'm not sure whether `Parity-Sync/Data-Rebuild in progress.` got complete. But now its showing as Read-check paused.

unmhn-diagnostics-20231229-1754.zip

[JorgeB]

Disk2 dropped offline, looks more like a power/connection issue, check/replace cables and post new diags, also replace cables for the cache SSD.

[mhn_10]

I retried after reconnecting and did a repair with '-L'.
But this time after stopping and starting the drive, no `Parity-Sync/Data-Rebuild` is shown. Drive is still disabled

 

This was the output after '-L'

Phase 1 - find and verify superblock...
Phase 2 - using internal log
        - zero log...
        - scan filesystem freespace and inode maps...
        - found root inode chunk
Phase 3 - for each AG...
        - scan and clear agi unlinked lists...
        - process known inodes and perform inode discovery...
        - agno = 0
        - agno = 1
        - agno = 2
        - agno = 3
        - agno = 4
        - agno = 5
        - agno = 6
        - agno = 7
        - agno = 8
        - agno = 9
        - process newly discovered inodes...
Phase 4 - check for duplicate blocks...
        - setting up duplicate extent list...
        - check for inodes claiming duplicate blocks...
        - agno = 0
        - agno = 3
        - agno = 1
        - agno = 2
        - agno = 6
        - agno = 4
        - agno = 5
        - agno = 7
        - agno = 8
        - agno = 9
Phase 5 - rebuild AG headers and trees...
        - reset superblock...
Phase 6 - check inode connectivity...
        - resetting contents of realtime bitmap and summary inodes
        - traversing filesystem ...
        - traversal finished ...
        - moving disconnected inodes to lost+found ...
Phase 7 - verify and correct link counts...
Maximum metadata LSN (7:0) is ahead of log (1:2).
Format log to cycle 10.
done

 

[mhn_10]

I'm trying to do a rebuild with this https://docs.unraid.net/unraid-os/manual/storage-management/#rebuilding-a-drive-onto-itself

[JorgeB]

2 hours ago, mhn_10 said:

But this time after stopping and starting the drive, no `Parity-Sync/Data-Rebuild` is shown. Drive is still disabled

You must do a rebuild.