Damaged Drive

[AndrewS68]

If 1 drive out of a 2 drive Mirror pool failed, the pool would likely not import automatically.

Simply bring up the NAS with both drives, and manually run this command;
zpool import
Then post the results in code tags here for us to help you further.

This will tell us if your pool appears importable. And potentially which drive has failed.


A great many new users to TrueNAS & ZFS run across this, so don't panic, yet. If the 2 way Mirror still has a functioning drive, you likely have not lost any data.

I am in a slightly similar situation. I have a single pool (mirrored 18TB), 1 drive is the surviving member (no errors) and now shows the pool status as healthy BUT with no redundancy. Pool status is Online, but only 1 disk. I just upgraded to TrueNAS-SCALE-22.12.2 and the menus are quite a bit different than before. I can't seem to "add" the disk back to the pool. It only shows the other disk and when highlighted to "replace" it which doesn't seem the right action. Do I need to remove the pool and recreate it with the old disk and new disk added?

 

[jgreco]

Welcome to the forums.

Sorry to hear you're having trouble. Please take a few moments to review the Forum Rules, conveniently linked at the top of every page in red, and pay particular attention to the section on how to formulate a useful problem report, especially including a detailed description of your hardware.

TrueNAS requires a minimum of two pools to operate, one for your boot pool and one for data. You say you only have a single pool. If you only have two drives, you either need to skip having redundancy (giving up one of ZFS's most valuable features) or figure out how to attach some additional devices for a boot pool. Small (60-120GB) SSD's are ideal for boot pool drives.

 

[AndrewS68]

Welcome to the forums.

Sorry to hear you're having trouble. Please take a few moments to review the Forum Rules, conveniently linked at the top of every page in red, and pay particular attention to the section on how to formulate a useful problem report, especially including a detailed description of your hardware.

TrueNAS requires a minimum of two pools to operate, one for your boot pool and one for data. You say you only have a single pool. If you only have two drives, you either need to skip having redundancy (giving up one of ZFS's most valuable features) or figure out how to attach some additional devices for a boot pool. Small (60-120GB) SSD's are ideal for boot pool drives.

JGreco, sorry for my confusion on the details.
Here's what I have installed:
ASUS Mobo
i7-3770k
16GB
Boot Pool contains 2 Mirrored (working fine) PNY 128GB
PNY_CS1311_120GB_SSD
Data Pool contains 2 Mirrored Seagate 18TB
Seagate ST18000NM013J

I believe this is an educational issue on my part and not understanding how 'replace' works in the pool or how to fix the data vDev Mirror.
When I attempt to "add" the drive back to the mirror/pool, it is suggesting that it will EXTEND the entire configuration to double the capacity in a non-protected stripe. (Which I know is not what I want, and I'm given a warning message about that) so I back out of the entire operation.