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

[Joe Julian]

On 10/8/2014 1:45 AM, justglusterfs at gmail.com wrote:
> 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 m**inutes， * *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??*
>
If you need it healed that quickly, mount the volume on a client and 
walk the tree with "find -exec stat {} \; > /dev/null"
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