So when I use reboot to restart my server, my 2 ssds that I have in a BTRFS Cache both disappear, and are not able to be found at all.  Stopping the Array, I can't add them back to cache drives.  I have to power down the whole server, and start it cold, then they appear as unassigned and I can add them back as cache and restart the Array and everything is fine.   If I use power down, and cold boot it, cache drives are there.   Any clue?  Use to not do this.  I am on 6.5.3  Or