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Disabling Hardware Accelerated Move (XCOPY) in ESXi (2146567)

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ESXi hardware acceleration supports the following array operations:

  • Atomic Test & Set (ATS), which is used during creation and locking of files on the VMFS volume
  • Clone Blocks/Full Copy/XCOPY, which is used to copy or migrate data within the same physical array
  • Zero Blocks/Write Same, which is used to zero-out disk regions.

    Full copy, also called clone blocks or XCOPY. Enables the storage arrays to make full copies of data within the array without having the host read and write the data. This operation reduces the time and network load when cloning virtual machines, provisioning from a template, or migrating with vMotion.

    The fundamental operations are controlled by these advanced settings:
    • HardwareAcceleratedLocking
    • HardwareAcceleratedMove
    • HardwareAcceleratedInit
    This article explains how to disable HardwareAcceleratedMove (XCOPY) in ESXi


    • To disable Hardware Accelerated move a.k.a. use the following ESXCLI command:

      esxcli system settings advanced set --int-value 0 --option /DataMover/HardwareAcceleratedMove

      Note: This option is effective immediately and does not need any reboot or mount/unmount of volumes.

    • To disable hardware accelerated move using the vSphere Web Client, follow the below procedure :

      1. Browse to the host in the vSphere Web Client navigator.
      2. Click the Configure tab.
      3. Under System, click Advanced System Settings.
      4. Change the value for DataMover.HardwareAcceleratedMove to 0 (disabled):

      Note: This option is effective immediately and does not need any reboot or mount/unmount of volumes.

    Additional Information

    This is a list of commonly used SCSI opcodes related to VAAI operations:
    WRITE SAME(16)
    WRITE SAME(10)
    Occasionally, failures during VAAI operations would be logged in the /var/log/vmkernel.log file as shown in this example:
    Cmd(0x41248092e240) 0x42, CmdSN 0x13bb23 to dev "naa.xxxxxxxx" failed H:0x0 D:0x2

    See Also

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