urgent journal conf on ceph.conf

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Pls can someone help me with the ceph.conf for 0.56.2. I have two servers for STORAGE with 3tb hard drives each and two SSD's each.  I want to use OSD data on the hard drive and osd journal on SSD. 

I want to know how osd journal configuration is set to SSD. My SSD is mounted on /dev/sdb.

I have tried the osd data configurations  devs = /dev/sda and it worked just good. 

Is this line correct "osd journal = /dev/osd$id/journal" ?? and " osd journal = /dev/sdb " ???

[global]

                auth cluster required = cephx
                auth service required = cephx
                auth client required = cephx
                debug ms = 1

[osd]
                osd journal size = 1000
                osd journal = /dev/osd$id/journal
                filestore xattr use omap = true
                osd mkfs type = xfs
                osd mkfs options xfs = -f
                osd mount options xfs = rw,noatime,

[osd.0]
                host = server04
                devs = /dev/sda
                osd journal = /dev/sdb
[osd.1]
                host = server05
                devs = /dev/sda
                osd journal = /dev/sdb

THANKS. 		 	   		  --
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