2 Replies Latest reply: Oct 22, 2012 5:57 AM by Catch 22 RSS

    creating  asm disk on nfs very slow

    969742
      hi

      we are creating asm disk group on nfs, 1 gb it was took almost 3mins,

      dd if=/dev/zero of=/oradata/ASM_DATA01 bs=8192 count=13107200


      we need 500 gb ? any way we can increase the speed? this is normal or slow ?


      DB : 11grr2

      OS: sun 11
        • 1. Re: creating  asm disk on nfs very slow
          Billy~Verreynne
          NFS uses TCP.

          TCP was never designed to be used as a storage protocol. It is seriously slow. Which is why VoIP for example uses a lighter weight and faster UDP for example.

          However, for a storage protocol state is important. UDP does not provide that. TCP does.

          Another problem is that with NFS you run your storage protocol over a shared medium. There are numerous other network applications and services using that IP network and subnet. A single large scp copying data, or a user watching a HD youtube video, can significantly impact network performance - and drastically decrease the reponse and speed of your storage over TCP.

          IMO, using TCP as a storage protocol (especially for a RDBMS) is silly. The protocol is not suited. The medium is shared. I would expect performance to ALWAYS be an issue in such a case - the rule and not the exception.
          • 2. Re: creating  asm disk on nfs very slow
            Catch 22
            There are too many unknown factors that could adversely affect your performance. For what it's worth. I can create a 1 GB file in 10 seconds on a 1 Gbit network using a NAS.