Hello everyone I noticed when I login to my True Nas system I was greeted with a degraded faulted disk error message. I am assuming I need to replace it, my question is how do I know what disk to remove. I have attached a screenshot
I see the disk are labeled but looking in my machine I am not sure which one it is. I would think it’s the disk closes to the bottom of my Nas
I am not sure what I need to do after replacing that bad disk also
Thanks for any help with this
Is this an official TrueNas device? If yes, I think you can look up the slot somewhere in the ui.
If not, I would go to Storage/Disks and look up brand, model number, and serial of /dev/sdg.
Then shut down the server and identify the correct disk - the serial is printed on the disk labels. It requires you to pull out the disks one by one to verify the serial, so do not do this with the nas running.
That allows you to identify the disk in question.
While doing so, note down which serial and disk model sits in which slot - then you know it for future reference.
This is a home server that I built not an official TrueNas device. I will take a look and see what I can find. Thank you
When you select the faulted disk on the right hand side can you see a serial number referenced?
Edit:
Hi Johonny let me check, Yes I see it
Ok then make a note of it, power down the NAS and pull each disk to identify your bad one.
Will do 
Your screenshot is showing errors on three devices in a RAIDZ2.
While only one has fully FAULTED you are at risk of losing your pool if the other two drives get kicked out because of an increasing number of errors.
Do you have a backup?
I have a backup of my config files. Not sure why these drives would be getting these errors there pretty new.
I removed that bad disk and rebooted and it’s not showing any errors on any disk. I am also running a smart test as well
Did you replace it, or is your pool running with one disk missing?
That’s normal; ZFS errors clear on reboot. It doesn’t mean any problem has magically fixed itself.
What type of drives are they? Make/Model?
@Robert_G
Do you know that the drive is bad?
Why do I ask? Because ZFS errors can be caused by other things beside a failing hard drive. And I’m not saying the drive is good, but are you replacing a drive that is good?
Take a look at my little Drive Troubleshooting Flowchart link in my signature. It will help identify if you have a drive failure or possibly something else, and it will be quicker than message exchanges here.
If you do use this flowchart, I would appreciate comments back on how to make it more user friendly.
To tell you the truth I don’t, I removed that drive and formatted and want to try and add it again
I concur, this is why it’s so important to run your scripts, snapshots, and SMART Tests on pools. A smart error by itself is not an issue - it could be something innocuous like a string of a bazillion CRC errors due to a bad cable. On the other hand, falling He Levels in a He-drive or unrecoverable sectors point to the drive going bad.
For whatever reason, I get some serious fun out of retiring drives. Usually with the help of a 13lb maul or angle grinder.
I would not add it immediately. Formatting a drive (even successfully) does not confirm it’s good. At best, it confirms you can format the drive and perhaps a failing sector is de-allocated and replaced by a reserve one. But the drive might still be failing.
Instead, run the usual suite of badblocks, SMART tests, etc. on it and confirm that the drive is good. That is what I do with all the drives I have here to replace my current pool contents with. They are all pre-qualified spares so I have a pretty good probability that they will be good.
I like putting bullets through them myself, but I sometimes think an angle grinder is my dad’s (proud graduate of the Bigger Hammer School of Technology) favorite tool.
And who hasn’t done this kind of sanitizing for data before? It can be therapeutical.
How would I add another drive to my current storage pool. Thank you
You need to be more specific with this request.
Are you replacing a drive or “Expanding” the capacity by adding another 2TB drive?
All those answer should be in the online User Manual located at the top of your the forum page called “Docs & AI Search” and then use the AI search to replace or expand a RAIDZ2 pool. We are more than happy to help but if we can show you were to look, you will be able to do things faster without waiting on someone to respond.
Cheers
Hello I am replacing a bad drive for my current True Nas pool. I want to add the new drive to my existing pool that I already have I am not sure if this is call extending
but none the less this is what I would like to do. And yes it’s a 2TB drive
