Move OS to a different disk

[anthonypants]

My TrueNAS installation is currently on an M.2 disk, but I want to put a SATA SSD in there for the OS and use the M.2 disk as a ZFS cache. Can I do that without losing any of the data in my zpool?

 

[danb35]

Of course--why do you think the OS is on a separate device? Download your config from the running system, do a fresh installation to the new SSD, upload the saved config file to the new installation.

 

[ThreeDee]

I did the opposite .. I installed a 128 M.2 NVMe and then mirrored it to my SSD boot disk .. then unattached the SSD and made the M.2 my boot drive