Hey,

Having quite the adventure here. 

Since some of my HDDs were getting old I decided to start moving to new ones using Rebuild -- basically pulling one out at a time and letting rebuilding work. Wroked perfectly for the first one, but then when I replace the next one and restarted, all of a suddent 6 drives were marked as missing. 

Turned off the machine, checked all the cabling again and restarted. All drives, except the one that I wanted to replace showed up fine. I assigned the missing one to the new drive and started the array, only to get the "Unmountable: No file system" error on all 6. Strangely enough rebuilding started. I stopped it and tried to get into maintenance mode but I can't now since it's telling me that too many drives have errors. 

For sure I cannot rebuild for 6 drives. The most I can is 2 as I have two parity drives.

A bit stuck on how to proceed so any help is appreciated. Logs attached. 

tower-diagnostics-20241110-1016.zip

You are having issues with multiple disks, check all cables/connections and post new diags after array start.

Checked again the cables....didn't do that much in the end, and somehow now only one HDD is shown as disabled besides the one I wanted to replace anyway.

 

Started the rebuild for both as I couldn't enable the disabled one.

 

 

Here are the logs.

tower-diagnostics-20241110-1214.zip

No errors so far, all disks appear to be mounting, including the disabled ones, if contents look correct you can try rebuilding on top.

 

P.S. you need to run a correcting scrub on the pool, btrfs is detecting data corruption.

Hey!

Thanks for taking the time to check the logs.

Two follow-up questions if possible:
1. When you say on the pool -- you mean on the cache pool I have right? And I need to do it while being in maintenance mode?

2. I do not get why I got this disabled HDD. If it was a cable problem and somehow the other drives got fixed by moving a bit the cables....why is this remaining one still in disabled?
 

15 hours ago, Thomas Edain said:

When you say on the pool -- you mean on the cache pool I have right? And I need to do it while being in maintenance mode?

Yes, and the scrub must be run with the fs mounted.

 

15 hours ago, Thomas Edain said:

I do not get why I got this disabled HDD. If it was a cable problem and somehow the other drives got fixed by moving a bit the cables....why is this remaining one still in disabled?

Once a write to a disk fails Unraid disables it, and after that it needs to be rebuilt.

 

46 minutes ago, JorgeB said:

Once a write to a disk fails Unraid disables it, and after that it needs to be rebuilt.

 

Unimportant of how big that write is? Thinking of a situation similar to mine where more drives were shown as unmountable because of cabling. If it was between losing the entire volume or just a smaller amount of data, I would definitely opt for the smaller amount of data. Hope it make sense what I am saying.

 

Thanks again for the quick answer and check.

2 hours ago, Thomas Edain said:

Unimportant of how big that write is?

Yep, just a single sector write fail will disable it.

Thanks JorgeB for the support. We can close this thread.