[Gluster-devel] glusterfs replica volume self heal lots of small file very very slow！！why？how to improve？

[justglusterfs at gmail.com]

Hi all：
      I do the  following test：
     I create a glusterfs  replica volume (replica count is 2 ) with two server node(server A and server B)，use XFS as the underlying filesystem，  then  mount the volume in client node，
    then， I  shut down the network of server A node， in  client node， I copy a dir（which has a lot of small files）， the dir size is 2.9GByte，
    when  copy finish， I unmount the volume from the  client， then I start the network of server A node，   now， glusterfs  self-heal-daemon start heal dir  from  server B to  server  A， 
    in the  end，  I find the self-heal-daemon   heal the  dir use  40 minutes，  It's too slow！  why？

   I   find out   related options  with  self-heal， as  follow：
   cluster.self-heal-window-size
   cluster.self-heal-readdir-size
   cluster.background-self-heal-count

   
  then  I  config :
  cluster.self-heal-window-size  is  1024(max value)
  cluster.self-heal-readdir-size   is  131072(max  value)
   
  and  then  do  the  same  test case,  find  this times  heal the dir  use 35 minutes,   The effective is not obvious, 
  

  I  want  to ask,  If there are better ways to improve replica volume self heal  lots of small file  performance??
  
  thanks！



justglusterfs at gmail.com
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