If you're switching disks while the machine is running, the LVM bits might not be detected when the disk is added. Here's a couple of commands you can use to rescan for the device, and then activate it manually. If your device is /dev/sdc, then run: lvmdevices --adddev /dev/sdc Now you can| Ian's notes
| The Grumpy Troll: The Grumpy Troll
Experimenting with systemd-cryptenroll to mount luks2 encrypted usb device| Random Ramblings
Describes on how to achieve mount ordering in Jessie where x-systemd.requires is not present.| Random Ramblings