Ceph

hi,guys:
In order to store my osd journal in another directory ,I set the configuration 'log file = /home/ceph-log/$cluster-$name.log',instead of 'log file = /var/log/ceph/$cluster-$name.log'.However,when I create osds, there is no any osd log file in the /home/ceph-log/ directory.
And I found that "log_file": "/home/ceph-log/ceph-osd.0.log"when I use ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok config show |grep log_file.

Then i changed the log_file to the default value, I could find those log files again
   I really need your help, thanks a lot