Degraded Pool / Need to convert from stripe to mirror

[svtkobra7]

I have a perplexing issue where a ZPool Status Report / SMART Report show everything to be OK and then a few hours later I see read / write errors. Considering the SMART report showed the drive was OK, I tried to replace the disk with the same one, but it gave an error because an existing partition was found. Upon that erring, I tried to force it, but that didn't work. I ran a zpool detach which converted that mirror to a stripe. I ran a scrub and rebooted, now I need to figure out:

• Does that drive really have errors, and
• How to convert that stripe to a mirror

I've tried to be as prescriptive as possible with providing information below. Thanks for your help.

1. Volume Status: Prior to Issue

• Tank1
  • mirror-2
    • da11p1 / da9p1
  • mirror-1
    • da6p1 / da4p1
  • mirror-0
    • da3p1 / da2p1

2. Volume Status: Scrub in Progress / Pre-Reboot

• Tank1
  • stripe
    • da11p1
  • mirror-1
    • da6p1 / da4p1
  • mirror-0
    • da3p1 / da2p1
• 

3. Volume Status: Post-Scrub / Post-Reboot

• Tank1
  • stripe
    • da10p1
  • mirror-1
    • da6p1 / da4p1
  • mirror-0
    • da3p1 / da2p1
• 

Timeline of Events (Prior to Taking Any Action)

• Monday @ 12:00 AM - ZPool Status Report
  • No Read / Write Errors
    
  • 
• Monday @ 12:00 AM - SMART Status Report
  • No errors logged
    
  • 
• Monday @ 3:29 AM - Tank1 Degraded
  
  • "The volume Tank1 state is DEGRADED: One or more devices are faulted in response to persistent errors. Sufficient replicas exist for the pool to continue functioning in a degraded state."
    
  • Read / Write Errors Shown in GUI

Action Taken

• ZPool Status Confirms "DEGRADED" - See attached ZPool Status 1.txt
  
• zpool detach Tank1 9422221597572091878
• Initiated Scrub
• ZPool Status Confirms "ONLINE" - See attached ZPool Status 2.txt

 

[m0nkey_]

Does that drive really have errors

You will need to run smartctl to determine if it has errors.

How to convert that stripe to a mirror

Unfortunately you cannot. Your only recourse here is to backup your data and rebuild the pool.

 

[gpsguy]

Not with the webGUI, but he could create the mirror via the command line. He'd need to search the forums for the commands.

Unfortunately you cannot.

 

[Ericloewe]

What a weird rendering bug:

Firefox on the left, Edge on the right.

 

[m0nkey_]

What a weird rendering bug:

View attachment 20480

Firefox on the left, Edge on the right.

Do you have any kind of screen scaling? I get weirdness like that sometimes.

 

[Ericloewe]

Nope, 100%. Took me a week to get used to it some three years ago. Also happens when the window is shrunk down to mobile resolutions.

 

[Stux]

Not with the webGUI, but he could create the mirror via the command line. He'd need to search the forums for the commands.

zpool attach right?

 

[gpsguy]

Yeah, I also noticed it this morning. I use the Firefox ESR version on Windows with a number of extensions.

What a weird rendering bug

 

[gpsguy]

Yes, but one needs to run a few other commands first.

There are several threads on the topic on the forum. It took a bit of searching to find the one I remembered - https://forums.freenas.org/index.ph...ol-to-change-existing-stripe-to-mirror.26326/

zpool attach right?

@svtkobra7 do you have an environment where you can test this? Like a VM, etc. I'd backup any critical data data first, since backing up and rebuilding your pool correctly like @m0nkey_ said is also an option.