how does recovery work

Dennis Benndorf <dennis.benndorf@xxxxxxxxxxxxxx> · Thu, 19 Oct 2017 12:00:42 +0200



    Hello @all,
    givin the following config:
    
      
        ceph.conf:

        
      ...

        mon osd down out subtree limit = host

        osd_pool_default_size = 3

        osd_pool_default_min_size = 2

        ...

      
        each OSD has its journal on a 30GB partition on a
          PCIe-Flash-Card
        3 hosts

        
    What would happen if one host goes down? I mean is there a limit
      of downtime of this host/osds? How is Ceph detecting the
      differences between OSDs within a placement group? Is there a
      binary log(which could run out of space) in the journal/monitor or
      will it just copy all object within that pgs which had unavailable
      osds?
    Thanks in advance,

    Dennis

  
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