2 Replies Latest reply on Nov 28, 2017 3:21 AM by parmarr

    Slow speed ESXi 6.5 AHCI

    matteu Lurker



      I'm french, I don't speak very well english but I'll try to do my best !


      I installed fresh 6.5U1 vsphere on home computer for homelab.

      I used custom iso because i have realtek network card.


      I have issue with speed on my hard disk.


      If I plug my HDD on my computer and transfer a file to it (C drive to D drive) -> 140MB/s

      If I put this HDD on my ESXi 6.5 computer, format as VMFS 6 and create vmdk in W10 vm and test to copy file from C (on SSD datastore) to D -> 50MB/s


      I did a lot of test since yesterday, but can't find where is my issue...


      I tried to used legacy AHCI driver but same result. I don't know where to find...

      My storage controler is Intel cougar

        • 1. Re: Slow speed ESXi 6.5 AHCI
          matteu Lurker

          I would like to update this issue.

          I did some additionnal test :


          If i put my HDD RDM to one VM -> 150MB/s


          ====> ESX driver is not good for my storage controller ?

          I have Intel cougar 6


          Is there one solution to improve performance without use RDM disk ?


          Then, I would like to know if I buy a Supermicro motherboard X8XXX (1366 socket) :

          VMware SAS driver will be good ? storage driver ? Or I can have the same issue and slow disk performance ?

          • 2. Re: Slow speed ESXi 6.5 AHCI
            parmarr Expert
            Knowledge ChampionVMware Employees

            Configuring vSphere environment is highly not recommended since storage performance affected due to 7.2k RPM on local hard disks.

            VMware Knowledge Base