cryptsetup не шифрует раздел[SOLVED]

localhost ~ # cryptsetup -y luksFormat /dev/sda4

WARNING!
========
This will overwrite data on /dev/sda4 irrevocably.

Are you sure? (Type uppercase yes): yes
localhost ~ # 

подскажите что не так?
В ядро вкомпилено:

Device Drivers  --->
  [*] Block devices  --->
  [*] Multiple devices driver support (RAID and LVM)  --->
    <*>   Device mapper support
    <*>   Crypt target support
-*- Cryptographic API  --->
  <*>   SHA224 and SHA256 digest algorithm