vSphere Storage Appliance

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  • 1.  Help NFS Storage

    Posted Sep 23, 2022 08:31 AM

    (Translated by Google)


    I have 2 ESXi connected by fiber optic cable to a switch and from this one with another fiber optic cable to a Synology NAS with 3xSSD disks in RAID5 and 2x SSD-M2 for cache. Nothing else is connected to this switch. The file system I use for virtual machines is NFS v3



    In the ESXi I have a standard vswitch connected exclusively for this network of NFS disks and another vswitch for the VMs, management and vMotion.



    When I do an analysis of disk latencies with the esxtop tool for a VM that has SQL installed, I find this:



    There are users who complain about slowness and RAM memory, CPU and network there are no problems, the resources are low, but the write and read latencies show these peaks with these averages (msec) quite high.

    Should I be worried? How could I improve these latencies?


  • 2.  RE: Help NFS Storage

    Posted Sep 23, 2022 09:28 AM

    Just look at esxtop to see where the latency occurs (GAVG / KAVG / DAVG), this indicates where the problem may reside: Guest / Hypervisor / Storage layer. That will help troubleshooting it. Wouldn't surprise me if the problem is in the storage layer (Synology). Are you pushing much traffic when you see these spikes?

  • 3.  RE: Help NFS Storage

    Posted Sep 23, 2022 10:38 AM

    (Translated by Google)

    Thanks for the quick reply.

    If I export esxtop to a csv and open it with Windows perfmon, this is the same graph that I attached before but with the data of "Physical Disk NFS Volume"


    The color red (driver) and green (guest) are the ones with the most averages and peaks.
    Could the problem then be with the Synology NAS or the fiber - switch connection?
    Thank you

  • 4.  RE: Help NFS Storage

    Posted Sep 23, 2022 11:28 AM

    could be either, but chances are a lot bigger that it is the Synology in my opinion. I assume the Synology has some perf monitoring capabilities.


  • 5.  RE: Help NFS Storage

    Posted Sep 23, 2022 02:46 PM


    Vi que sus capturas están en español, por lo cual mis sugerencias en este idioma.

    Solo tiene una NIC para la conexión con el storage, esto representa un peligro ya que al fallar la NIC, el cable o el port del Switch externo, se pierde la conexión con el Storage.  Debería pensar en agregar otra NIC (o liberar alguna del otro Switch).

    El Switch externo donde se conecta el ESXi hot y el Syslogic NAS tiene configuración alguna?

    Las NICs en el ESXi host son de 10GB, el Switch externo y el Syslogic NAS tiene también ports de 10GB ?

    Ha probado actualizar el Firmware de las NICs en el ESXi host y/o el Firmware en el Syslogic NAS ?


  • 6.  RE: Help NFS Storage
    Best Answer

    Posted Sep 26, 2022 02:05 PM


    Voy a halar con Synology a ver que opciones me dan y vuelvo a postear aquí.


    Thank you,

    I'm going to talk to Synology to see what options they give me and I'll post here again.

  • 7.  RE: Help NFS Storage

    Posted Oct 04, 2022 08:20 AM

    Hello again
    Doing some research on the internet, it seems to improve performance using NFS 4.1 with multipathing and Synology API for VMWare VAAI.
    My 2 ESXi are version 7
    What is your opinion?