[doc] Adding/Removing OSD is not thorough

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Dear list,

When I tried to add OSD manually,  following the
http://ceph.com/docs/v0.78/rados/operations/add-or-rm-osds/.


It said:

ssh {new-osd-host}
ceph-osd -i {osd-num} --mkfs --mkkey

But It won't create the empty  sysvinit file as ceph-deploy does in centos.

If we do not have sysvinit file or added OSD information to ceph.conf,
/etc/init.d/ceph can not start the OSD.


1.  this solution is very easy.
 change the document a bit, remind the user to create
sysvinit file in /var/lib/ceph/osd/ceph-{osd-num}/ for centos.

Or

2.  add new options in  ceph-osd command(such as ceph-osd -i {osd-num}
--mkfs --mkkey  --mkstart ),

and change the document accordingly.

any ideas?


----

Dongmao Zhang
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