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Help, 1 disc corrupted, all data on that drive gone?

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  • Author

Gotcha, I don't think it lets you do just 1 so good call.

so to be extra clear. I stop array, start in maintenance mode (with disk1 no selected? if i select it i believe it starts the rebuild). then go to main, click disk3, down to check filesystem? (haha I'm still scared sorry)

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  • Turbo (reconstruct write) reads all drives in parallel so parity can be calculated and written at the same time the data disk is written. Disk4 is your smallest disk so it will typically be the slowe

  • Community Expert
8 minutes ago, DiscoStu said:

with disk1 no selected?

correct

  • Author
2 minutes ago, trurl said:

correct

kk thanks. not a good start....

xfs_repair status:

Phase 1 - find and verify superblock...
couldn't verify primary superblock - not enough secondary superblocks with matching geometry !!!

attempting to find secondary superblock...
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Running

  • Community Expert
3 minutes ago, DiscoStu said:

Running

Let it run maybe it will find something.

Just to make sure. You aren't trying to check filesystem from the command line are you?

  • Author

looks hung, still hasn't moved since what I posted. But I'll let it go

nope i did it from main, disk3, check...

  • Author

I do have to go to bed soonish... should I let it run overnight without worry?

Then ultimately am i looking at either

A. this fixes 3 magically, then rebuild 1

or B. this does nothing, and the move is to restart normal mode, double format, and rebuild on both?

  • Community Expert
13 minutes ago, DiscoStu said:

I do have to go to bed soonish...

me too

13 minutes ago, DiscoStu said:

should I let it run overnight without worry?

yes

15 minutes ago, DiscoStu said:

Then

You said you had original disk1 so that data should be OK. Do you have backups of disk3 data?

  • Author
Just now, trurl said:

me too

yes

You said you had original disk1 so that data should be OK. Do you have backups of disk3 data?

ha, sleep well and thanks again, I'll let it run and post any results in the morning.

Sort of, I have the original disk3 from a few months ago when i upgraded that too. Disks 3 and 4 are mostly backups for other stuff so if I have to format wont be the end of the world. The stuff on disk1 is all i am really worried about

  • Author

9 hours ago, trurl said:

Let it run maybe it will find something.

Just to make sure. You aren't trying to check filesystem from the command line are you?

Finished by the time I woke up... Going to stop the array until I get home from work

Phase 1 - find and verify superblock...
couldn't verify primary superblock - not enough secondary superblocks with matching geometry !!!

attempting to find secondary superblock...
..............
...found candidate secondary superblock...
verified secondary superblock...
would write modified primary superblock
Primary superblock would have been modified.
Cannot proceed further in no_modify mode.
Exiting now.


Now there is the option to "Fix, file system corrupted". Is the next step to try the fix?

Is it really dumb I'm debating trying to make a backup of what is on disk3 (that is currently emulated), just in case it nukes again? Again this data not the end of the world if I lose though.
  • Author

Sorry that for formatting was so bad, there were about 100 lines of ......, too big to paste

  • Community Expert
47 minutes ago, DiscoStu said:
Now there is the option to "Fix, file system corrupted". Is the next step to try the fix?

Yep

  • Author
50 minutes ago, JorgeB said:

Yep

K, very scared but I'll do it when I get home. I hope it doesn't make me run the check again to do the fix, it took a whiiiiile

  • Author

Thanks again gents

Fix is in progress, noticed that under main it at least says xfs next to disk3 where it once said unmountable, so hopeful this does the trick. Even if it nukes the data, as long as it is stable I'll move onto disk1.

For that... stop array, format disk1, then put it back into array, start in regular mode, let data rebuild? unsure if I need to do this part in maintenance mode as well

Edited by DiscoStu

  • Community Expert

Post new diagnostics with the array started in normal mode after disk3 fix complete.

  • Author

finished, and says fixed. I can't post all the results way too long but here is the end...

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...
Note - stripe unit (0) and width (0) were copied from a backup superblock.
Please reset with mount -o sunit=,swidth= if necessary
done

discoraid-diagnostics-20260130-1908.zip

  • Community Expert
54 minutes ago, trurl said:

Post new diagnostics with the array started in normal mode after disk3 fix complete.

  • Community Expert

Looks good. 6.4TB on disk3. Nothing in lost+found.

If you format emulated disk1, then assign a disk to that slot, it will rebuild disk1, but it will be empty of course since it has been formatted.

Then you can mount original disk1 with Unassigned Devices and copy its data to the empty disk1.

  • Community Expert

Any time you format a disk, you must check the list of unmountable disks in Array Operation and make sure it only lists disks you want to format. If any other disks are listed as unmountable that you don't want to format, you need to check filesystem and repair, then check the list again before proceeding to format the disks you want to format.

  • Author
1 minute ago, trurl said:

Looks good. 6.4TB on disk3. Nothing in lost+found.

If you format emulated disk1, then assign a disk to that slot, it will rebuild disk1, but it will be empty of course since it has been formatted.

Then you can mount original disk1 with Unassigned Devices and copy its data to the empty disk1.

Thanks great. I ran a smart test and checked the folders seems all good. Dumb question, is there a write up on how to read the diagnostics? I want to learn what you are reading and didn't find exactly that in your signature links.

  • Author

Should i format it first while not selected as disc1? (or stop array first and attempt to format there) then stop array, restart with it in that slot?

Edited by DiscoStu

  • Community Expert
Just now, DiscoStu said:

Should i format it first while not selected as disc1? then stop array, restart with it in that slot?

Yes

  • Author

rebuilding, probably will 24 hours or so

Is it safe to attempt mount the old drive during this, or transfer files to the array during the rebuild? I like being efficient, but I don't want to stress the drives.

Thanks again, lurking hard on your signature links, much to poke at when i get this back up!

  • Community Expert
6 minutes ago, DiscoStu said:

how to read the diagnostics?

All files in diagnostics except config/super.dat (array disk assignments) is simple text. I encourage everyone to examine diagnostics.

The files in config are mostly just the .cfg files that store settings from the webUI for your configuration.

The files in shares are the .cfg files for each user share configuration, plus a really useful file, shareDisks.txt, that shows which disks/pools have files for each share.

The files in logs are logs obviously. I mostly look at syslog, other files in diagnostics are very helpful in interpreting syslog, which is why we always prefer complete diagnostics instead of just syslog.

The files in system are the output of various commands that help explain your hardware and other things about your configuration, such as which plugins are installed. Several of these I find useful, such as df.txt for storage, lspci.txt for hardware, lsscsi.txt for disk connections, ifconfig.txt and ethtool.txt for network configuration.

  • Community Expert
6 minutes ago, DiscoStu said:

transfer files to the array during the rebuild?

Rebuild will affect transfer performance, and transfer will affect rebuild performance. I usually don't use the array much during rebuild or parity checks. Maybe just a small file occasionally. Anything going on in the pools will be fine, such as cached user share writes, dockers that aren't writing much to the array, etc. Most of my downloading goes to pools, for example, before it winds up on the array for long term.

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