maybe the below blog can help you :
http://cephnotes.ksperis.com/blog/2014/06/29/ceph-journal-migration/
在 Wed, 13 Jan 2016 11:06:33 +0800，小科 <1103262634@xxxxxx> 写道:
when my journal disk don't have enough space, i want change a other disk which has enough space to save journal.
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