Do not understand some terms about cluster health

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Hi, All

   When I type 'ceph health' to get the status of cluster, it will show
some information.

   Would you please to explain the term?

   Ex: HEALTH_WARN 3/54 degraded (5.556%)
 
         What does "degraded" mean ?  Is it a serious error and how to
fix it ? 

   Ex: HEALTH_WARN 264 pgs degraded, 6/60 degraded (10.000%); 3/27
unfound (11.111%)

         What does "unfound" mean?  Could we recover the data?  
         Would it cause the whole data in rbd image corrupted and never
access ?

   When I type 'ceph pg dump', it would show like this.  Would you
please explain what is "hb in" and "hb out" ?

	osdstat  kbused          kbavail          kb              hb in
hb out
	0       17300872        1884175720      1906311168
[6,7,8,9,10,11] [6,7,8,9,10,11]
	1       16661664        1884808728      1906311168
[6,7,8,9,10,11] [6,7,8,9,10,11]
	2       15695664        1886027584      1906311168
[6,7,8,9,10,11] [6,7,8,9,10,11]
	3       16463440        1885005328      1906311168
[6,7,8,9,10,11] [6,7,8,9,10,11]
	4       14101016        1888130760      1906311168
[6,7,8,9,10,11] [6,7,8,9,10,11]
	5       14015804        1888215124      1906311168
[6,7,8,9,10,11] [6,7,8,9,10,11]
	6       19312280        1881660776      1906311168
[0,1,2,3,4,5]   [0,1,2,3,4,5]
	7       14451992        1887521200      1906311168
[0,1,2,3,4,5]   [0,1,2,3,4,5]
	8       16336028        1885393468      1906311168
[0,1,2,3,4,5]   [0,1,2,3,4,5]
	9       16697868        1884773940      1906311168
[0,1,2,3,4,5]   [0,1,2,3,4,5]
	10      13530456        1888695776      1906311168
[0,1,2,3,4,5]   [0,1,2,3,4,5]
	11      13921908        1888307364      1906311168
[0,1,2,3,4,5]   [0,1,2,3,4,5]
	sum    188488992       22632715768     22875734016      


  And from the latest document, I know we can do the cluster snapshot by
" ceph osd cluster_snap <name>"
  Is that means we can rollback the data from the snapshot? Do you have
any related document to show how to operate it?

  Thanks a lot!




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