Strap In for this... Parity Good. One Good Drive Forgotten, Bad Drive Missing

[RussellG]

Ok, so I had a crazy AC leak and two of my three drives got wet and the PCBs fried. I had one parity, but two drives failed. I have since repaired one of the two bad drives (swapped ROM IC to a new donor board) and want to rebuild parity, but unraid has forgotten one of the disks. Before I go any further and bring confusion, I am going to start with my disks and their status
10Tb Parity - Good and healthy
10Tb Disk1 - Repaired and appears to be fine, but unRAID doesn't "remember" it?

10Tb Disk2 - Bad and missing.

 

So as you can see. Parity shows good. Disk1 (MPN) which is the original disk, has been forgotten for some reason. Disk2 (2MZ) is bad and I plan to replace with a good 10Tb drive. What I need to do is get unRAID to "remember" Disk1 and rebuild to a new disk for disk2. How do i do this?

I do not have any config backups. Any backups I had were on the array (lesson learned there). What can i do? Help me Tom Cruise, please and thank you!

Edited September 8, 2022 by RussellG

[trurl]

Do you have a new 10TB disk ready to assign as disk2?

 

[trurl]

Don't do anything without further advice

 

[RussellG]

19 minutes ago, trurl said:

Do you have a new 10TB disk ready to assign as disk2?

 

I do.

 

19 minutes ago, trurl said:

Don't do anything without further advice

 

10-4

[trurl]

Attach diagnostics to your NEXT post in this thread.

[trurl]

Will check back tomorrow

2 hours ago, trurl said:

Don't do anything without further advice

 

 

[JorgeB]

Like mentioned post the diags but you should be able to do a new config to make Unraid accept the new disk to rebuild the missing one, as long as parity is valid.

[RussellG]

10 hours ago, trurl said:

Attach diagnostics to your NEXT post in this thread.

unraid-diagnostics-20220908-0855.zip

Attached, apologies I dropped out yesterday. It was late over here.

[trurl]

Follow these instruction carefully. We will check along the way to make sure things are as they should be. If things don't seem to be working as described, or you have questions, ask.

1. Install new disk2
2. Go to Tools - New Config, Retain All, Apply
3. Assign new disk2
4. Check BOTH Maintenance mode AND Parity Valid boxes
5. Start the array

Then post a screenshot

 

 

[RussellG]

2 minutes ago, trurl said:

Follow these instruction carefully. We will check along the way to make sure things are as they should be. If things don't seem to be working as described, or you have questions, ask.

1. Install new disk2
2. Go to Tools - New Config, Retain All, Apply
3. Assign new disk2
4. Check BOTH Maintenance mode AND Parity Valid boxes
5. Start the array

Then post a screenshot

 

 

Ok, i am out for about 3-4 hours and will begin that when i get back.
In the event Disk1 is bad, this would not do anything to the parity disk, correct? I ask because the old Disk2 may be repairable I am still looking at purchasing another WD100EZAZ drive and taking that PCB, swapping ROM IC and fixing it. 
i guess i could just mount disk1 and look at its contents to somewhat verify it’s ok?

[trurl]

2 minutes ago, RussellG said:

In the event Disk1 is bad

Disk1 SMART looked OK except for 1 Reallocated which should be fine. If you want, you can run an extended self-test on disk1 before starting the above instructions. It would take many hours to complete.

 

5 minutes ago, RussellG said:

this would not do anything to the parity disk, correct?

Since New Config will be with Parity Valid, and array is started in Maintenance mode, no disks will be modified.

 

5 minutes ago, RussellG said:

mount disk1 and look at its contents

In later steps, you will be able to take a look at the contents of both disk1 and emulated disk2 before trying to rebuild anything.

 

12 minutes ago, RussellG said:

old Disk2 may be repairable I am still looking at purchasing another WD100EZAZ drive and taking that PCB, swapping ROM IC and fixing it.

That might be useful depending on how things go with trying to rebuild to a new disk.

[trurl]

46 minutes ago, RussellG said:

mount disk1 and look at its contents

This is more complicated than it sounds and no need to try.

 

30 minutes ago, trurl said:

In later steps, you will be able to take a look at the contents of both disk1 and emulated disk2 before trying to rebuild anything.

 

[RussellG]

4 hours ago, trurl said:

Follow these instruction carefully. We will check along the way to make sure things are as they should be. If things don't seem to be working as described, or you have questions, ask.

1. Install new disk2
2. Go to Tools - New Config, Retain All, Apply
3. Assign new disk2
4. Check BOTH Maintenance mode AND Parity Valid boxes
5. Start the array

Then post a screenshot

 

 

Alright, Done with all those steps.
Screenshot:

[trurl]

OK

 

Stop the array, set disk2 to Not Assigned

Start the array in Normal mode (don't check Maintenance mode)

Post a screenshot and new diagnostics

[RussellG]

2 hours ago, trurl said:

OK

 

Stop the array, set disk2 to Not Assigned

Start the array in Normal mode (don't check Maintenance mode)

Post a screenshot and new diagnostics

 

Ok, to confirm, do not check maintenance mode. It also wants me check this to start it:

 

Edited September 8, 2022 by RussellG

[trurl]

yes you want to do this. Really the whole point, since the missing disk has no data yet, we want to see what the emulated disk looks like

[trurl]

If emulated disk2 shows as unmountable, DO NOT FORMAT.

 

I will check back tomorrow

[RussellG]

32 minutes ago, trurl said:

If emulated disk2 shows as unmountable, DO NOT FORMAT.

 

I will check back tomorrow

Ok, so it started. And everything looks ok at first glance and a few spot checks? Requested diags and SS attached.

 

32 minutes ago, trurl said:

If emulated disk2 shows as unmountable, DO NOT FORMAT.

 

I will check back tomorrow

 

Roger. I am going to stop it for the night.

 

unraid-diagnostics-20220908-2238.zip

Edited September 9, 2022 by RussellG

[trurl]

That shows emulated disk2 is mounted and 70% full. So all you have to do is rebuild!

 

16 hours ago, trurl said:

In later steps, you will be able to take a look at the contents of both disk1 and emulated disk2 before trying to rebuild anything.

You are at that step now.

[RussellG]

3 hours ago, trurl said:

That shows emulated disk2 is mounted and 70% full. So all you have to do is rebuild!

 

You are at that step now.

Fingers crossed. Started rebuild with new disk. Thank you for your help! Sent over some beer/pizza funds as thanks.

[trurl]

Thanks for the donation!

 

Let us know how it goes.

[RussellG]

1 hour ago, trurl said:

Thanks for the donation!

 

Let us know how it goes.

Going Slowly 🥲

[trurl]

Post new diagnostics 

[RussellG]

33 minutes ago, trurl said:

Post new diagnostics 

 

Got it to speed up a good bit by disabling docker. Probably some of my containers trying to do things.

Diags attached

unraid-diagnostics-20220909-1012.zip

Edited September 9, 2022 by RussellG

[JorgeB]

Problem is disk2, it's failing:

 

=== START OF READ SMART DATA SECTION ===
SMART Health Status: FAILURE PREDICTION THRESHOLD EXCEEDED: ascq=0xfd [asc=5d, ascq=fd]

 

Do you have another spare?