Hi!

I'd like to set up new OSDs with bluestore: the real data ("block") on a 
spinning disk, and DB+WAL on a SSD partition.

But I do not use ceph-deploy, and never used ceph-disk (I set up the filestore 
OSDs manually).
Google tells me that ceph-disk does not (yet) support splitting the components 
across multiple block devices, I also had no luck while attempting it anyways. 
(using Ceph 12.1 RC1)

I just can't find documentation on how to set up a bluestore OSD manually:


  *   How do I "prepare" the block, block.wal and block.db blockdevices? Just 
directing ceph-osd to the block devices via ceph.conf does not seem to be 
enough.
  *   Do bluestore OSDs still use/need a separate journal file/device? Or ist 
that replaced by the WAL?

http://docs.ceph.com/docs/master/ also has not very much information on using 
bluestore, is this documentation deprecated?

Thanks for any hints,

Martin

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