Re: Shard in production

Lindsay Mathieson <lindsay.mathieson@xxxxxxxxx> · Thu, 21 Jan 2016 10:52:09 +1000



    Heh, thanks Krutika.

      
      I believe its pretty much there, have been stress testing it on
      our production VM cluster for weeks, though not with critical
      VM's. It is a huge improvement when for the heal process when
      dealing with large VM's. Failure modes have been very reliable to.

      
      Nb. All my testing has been VM's - e.g a few large files with only
      one process accessing them. I can't speak to the many thousands of
      dirs/files use case.

      
      If you are using it for VM hosting (as you are) then it is
      essential that you set the "virt" group properties, other wise you
      will end up with VM corruption. These are the settings I've
      evolved over my testing:

      
      Options Reconfigured:

        performance.readdir-ahead: off

        features.shard: on

        features.shard-block-size: 512MB

        cluster.self-heal-window-size: 256

        server.event-threads: 4

        client.event-threads: 4

        cluster.quorum-type: auto

        cluster.server-quorum-type: server

        performance.low-prio-threads: 32

        performance.io-thread-count: 32

        performance.cache-refresh-timeout: 4

        nfs.disable: on

        nfs.addr-namelookup: off

        nfs.enable-ino32: off

        performance.write-behind: off

        performance.strict-write-ordering: on

        performance.stat-prefetch: off

        performance.quick-read: off

        performance.read-ahead: off

        performance.io-cache: off

        cluster.eager-lock: enable

        network.remote-dio: enable

        cluster.data-self-heal-algorithm: full

      
      On 21/01/16 02:06, Krutika Dhananjay wrote:

    
        Adding Lindsay Mathieson, who has tested sharding with VM
          store extensively. :)

        
        -Krutika

        
        From: "Bello
          Florent" <florent.bello@xxxxxxxxxxxxxxx>

          To: gluster-users@xxxxxxxxxxx

          Sent: Wednesday, January 20, 2016 8:12:27 PM

          Subject:  Shard in production

          
          Hi,
          

            i see recently the Shard feature is reached to stable. Soon,
            i want to install oVirt with Gluster Replica Storage and i
            guess shard feature is good for me. Can i use this feature
            for my VM Storage production or you guess it's not mature ?
          

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    -- 
Lindsay Mathieson
  

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