I’m running TrueNAS SCALE, and my current boot pool consists of two mirrored USB sticks (64 GB each) connected to the rear USB 3.2 ports.
I’d like to replace them with two new 256 GB USB SSDs. My system only has one free USB port on the front (which probably is USB 2.0). I want to connect them to the back, of course.
My goal is to move the boot pool to the two new SSDs, keeping it mirrored and expanding the available space to 256 GB.
What’s the recommended procedure to do this safely?
The first thing to know… a larger boot pool drive will not expand the amount of available space. You have a few ways to replace the drives, you could add a single drive and make a 3 way mirror, then remove one of the usb drives. Next add the second ssd and add to the mirror. Once done you can remove the last usb flash drive. Then shutdown and move all drives to the USB connectors you want. Then go into the bios to configure the correct boot drive.
USB sticks may have ashift=9, and prevent the addition of a genuine SSD as mirror.
Save your configuration file, install anew on the new drive(s) and load the configuration. You will lose the previous boot environments.
