luks encrypted lvm across two disks / partitions

/dev/sda3 and /dev/sdb1

1. open encrypted parts
  
  cryptsetup luksOpen /dev/sda3 crypt1
  (enter pass)
  cryptsetup luksOpen /dev/sdb1 crypt2
  (enter pass)

2. lvm should automatically appear in /dev/mapper
  e.g. /dev/mapper/fedora-home
       /dev/mapper/fedora-root
  etc
  if not can try vgchange -ay

3. do stuff

4. when finished close the lv

  lvchange -an fedora

5. close the luks

  cryptsetup luksClose /dev/sda3
  cryptsetup luksClose /dev/sdb1