Yesterday I got a mail about a failed disk in my TrueNAS system.
![](https://nocin.eu/wp-content/uploads/2021/03/image-6-1024x102.png)
So I logged in and checked the Alerts and also zpool status
.
![](https://nocin.eu/wp-content/uploads/2021/03/image-2.png)
![](https://nocin.eu/wp-content/uploads/2021/03/image-1.png)
Luckily I had an unused disk lying around. So just did a quick look in the TrueNAS Wiki (https://www.truenas.com/docs/hub/tasks/advanced/disk-replace/) and switched the drives…
After 5 minutes everything was done and the resilvering started.
![](https://nocin.eu/wp-content/uploads/2021/03/image-4-1024x370.png)
![](https://nocin.eu/wp-content/uploads/2021/03/image-5.png)
![](https://nocin.eu/wp-content/uploads/2021/03/image-7-1024x147.png)
It took about 4 hours for the 3TB disk. A zool clear poolname
removes the error message and the pool was back online.
![](https://nocin.eu/wp-content/uploads/2021/03/grafik-1.png)