/dev/mapper/dm-crypto-plain is active and is in use.
  type:    PLAIN
  cipher:  aes-cbc-essiv:sha256
  keysize: 256 bits
  key location: dm-crypt
  device:  /dev/sdc3
  sector size:  512
  offset:  0 sectors
  size:    8388608 sectors
  mode:    read/write