Re: Adding new disk/OSD to ceph cluster

Eneko Lacunza <elacunza@xxxxxxxxx> · Mon, 11 Apr 2016 09:09:56 +0200



    Hi Mad,

      
      El 09/04/16 a las 14:39, Mad Th escribió:

    
      We
          have a 3 node proxmox/ceph cluster ... each with 4 x4 TB
          disks 

        
    Are you using 3-way replication? I guess you are. :)

    
      1)
          If we want to add more disks , what are the things that we
          need to be careful about? 

        
        Will
          the following steps automatically add it to ceph.conf?

        ceph-disk
          zap /dev/sd[X]

        pveceph
          createosd /dev/sd[X] -journal_dev /dev/sd[Y]

        where
          X is new disk and Y is the journal disk.

      
    Yes, this is the same as adding it from web GUI.
    
      
        2)
          Is it safe to run different number of OSDs in the cluster, say
          one server with 5 OSD and other two servers with 4OSD ? Though
          we have plan to add one OSD to each server.

        
    It is safe as long as none of your nodes OSDs are near-full. If
    you're asking this because you're adding a new OSD to each node,
    step by step; yes, it is safe.

    Be prepared for data moving around when you add new disks.
    (performance will suffer unless you have tuned some parameters in
    ceph.conf)

    
        3)
          How do we safely add the new OSD to an existing storage pool?

      
    New OSD will be used automatically by existing ceph pools unless you
    have changed CRUSH map.

    
    Cheers

    Eneko

    
    -- 
Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
Telf. 943493611
      943324914
Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
www.binovo.es
  

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com