2 Replies Latest reply on Jul 1, 2008 5:27 PM by tmilner

    More explanation on latency counters

    tmilner Enthusiast


      I'm confused about the definitions of the latency counters "Physical Disk Write Latency", "Kernel Write Latency", and "Disk Write Latency". Here's what I've been told about these 3 counters:


      • Physical Disk Write Latency -- HBA to Device latency

      • Kernel Write Latency - Guest O/S (thru Kernel thru HBA ) to Device latency

      • Disk Write Latency - The sum of the 2 values above.


      Isn't "Kernel Write Latency" the latency between the Guest O/S and the HBA? If not then I don't understand the difference between the last 2 counters. Can you enlighten me? Thanks.