strange OSD status when rebooting one server

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Hi,

I am hoping someone can help explain this strange message.  I took 1 physical server offline which contains 11 OSDs.  "ceph -s" reports 11 osd down.  Great.

But on the next line it says "4 hosts" are impacted.  It should only be 1 single host?  When I look the manager dashboard all the OSDs that are down belong to a single host.

Why does it say 4 hosts here?

$ ceph -s

  cluster:
    id:     xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    health: HEALTH_WARN
            11 osds down
            4 hosts (11 osds) down
            Reduced data availability: 2 pgs inactive, 3 pgs peering
            Degraded data redundancy: 44341491/351041478 objects degraded (12.631%), 834 pgs degraded, 782 pgs undersized
            2 pgs not deep-scrubbed in time
            1 pgs not scrubbed in time
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