cluster status information

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Hi!

How to get information about status of each server in cluster?

#ceph osd stat
2011-05-26 15:07:05.103621 mon <- [osd,stat]
2011-05-26 15:07:05.104201 mon0 -> 'e413: 6 osds: 5 up, 5 in' (0)

I see - in cluster 6 osd servers and now up only 5. How do I know which server is down?

More global question - how to monitor the state of servers in a cluster?

WBR,
    Fyodor.

P.S. JFYI: key "-s" do not described in manual page about ceph command.
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