Most tutorials for migrating to a new cache drive suggests moving data to the parity array using the mover, switching to the cache drive then running the mover again. But having around 150gb of cache data that’s still growing, it wasn’t really an option for me as it’d be too much downtime for Plex & my websites. I had both of my SSD’s plugged in, the current and the new cache drive. There are two methods for mounting the second SSD as a cache drive;
Mounting using the Unassigned Devices plugin
Using the multi pool option in 6.9.0 (I’m using Beta 30 as it’s stable for me)
For either option, I’d recommend waiting until you’ve upgraded to 6.9.0 stable or beta, as it brings several SSD improvements. Including less writes to reduce wear and other changes. To then copy over the files use the following command;
sudo rsync -auvh –progress <sourceDir>/* <destDir>
This will preserve all the permissions etc, so should be a direct mirror as it copies over.
You should be able to now mount this as the primary cache drive, and it should just take over. Start up the Dockers and VM’s and you should be good to go.