3 Replies Latest reply: Jun 4, 2013 8:13 AM by Victor Armbrust RSS

    X3 overhead due to WriteBack

    user1862659
    user1862659 Apr 27, 2013 7:45 AM
      Hi,

      Does anyone know whether there is any overhead in X3 when using the new WriteBack policy and use FlashCache for write operations?. We are planning to migrate from X2 model to X3 and ACS told me that there is a little overhead but I don´t know what is the reason and the percentage for this overhead.

      Regards.
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        • 1. Re: X3 overhead due to WriteBack
          LaserSoft
          LaserSoft May 14, 2013 8:13 PM (in response to user1862659)
          Hi Friend

          There are four methods are available in Write-Back Flash Cache.

          1. Write-through Read Path
          2. Write-back Read Path
          3. Write-through Write Path
          4. Write-back Write Path

          a. Flash cache provides the enhanced read and write performance.
          b. This means writes first happen on Flash cache and the database gives acknowledgment.
          c. Cell software then writes them back onto hard disk when it finds it necessary.

          It will improve performance for Applications like most "Insert" operations. Before configuration we have to configure ASM disk, Flash Cache carefully to avoid performance bottle necks

          Hope it helps..

          Thanks
          LaserSoft
          • 2. Re: X3 overhead due to WriteBack
            user1862659
            user1862659 May 15, 2013 4:53 AM (in response to LaserSoft)
            Hi,

            thank you for your answer, very interesting, but, do you know what´s is the reason for the overhead ?, that´s the true problem.

            Regards.
            • 3. Re: X3 overhead due to WriteBack
              Victor Armbrust
              Victor Armbrust Jun 4, 2013 8:13 AM (in response to user1862659)
              LaserSoft said all that you need to know (lol). Perfect

              I had implemented WriteBack in several customers at ACS, and I really don't see any kind of bottleneck till now. all implementation works fine (for X2-2 and X3-2). Last week I had implemented a X3-2 Quarter Rack with Writeback with no problem, all FlashCache operations work fine (Off course, X3-2 has more FlashCache memory than X2-2, but I really don't see any kind of bottlenecks)

              Victor

              Edited by: Victor Armbrust on 04/06/2013 10:13