[sheepdog-users] How to enable cache?

[Valerio Pachera]

I've been reading this page:
  https://github.com/collie/sheepdog/wiki/Journaling

If I run
  sheep -j dir=/path/to/dir,size=256
the daemon doesn't start, but I get 'journal_file0' written inside the
directory I chose.

'man sheep' doesn't mention the 'j' option but 'w' or '--enable-cache'.

sheep --enable-cache 256,writethrough /mnt/sheepdog/
  sheep: unrecognized option '--enable-cache'
  Try `sheep --help' for more information.

sheep -w 256,writethrough /mnt/sheepdog/
  invalid cache type: 256

I'm getting lost.

0.5.5_2_g0932366