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I'm getting this error when I tried to increase the memory of a VM in VMware ESXi

Failed to reconfigure virtual machine XXX. Unable to access file [VMS] XXX/boot.vmdk

boot.vmdk is already exist but still I'm getting this error.

  • VMWARE ESXi version is: 6.7.0 Update 2
  • Running DellEMC Customized version of VMware ESXi Image
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  • Please check if you can access the file from datastore and see if you are seeing any errors in the datastore.
    – Rachel
    Nov 18, 2022 at 6:39
  • We already checked it. There are no errors and the guest machine bootup without any issue
    – Dev
    Nov 18, 2022 at 6:48
  • Please check the section 'Corrupt VMDK File' in the KB article Verifying ESX/ESXi virtual machine files.
    – Gerald Schneider
    Nov 18, 2022 at 6:51
  • So, the issue occurs when you edit the VM, not when you try to turn it on? And the only thing you changed is the amount of RAM?
    – Gerald Schneider
    Nov 18, 2022 at 6:56
  • Is the host standalone or managed by vCenter? Are there any related entries in the event log of the host that might contain more information?
    – Gerald Schneider
    Nov 18, 2022 at 7:04

1 Answer 1

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Check the disk file for corruption (vmkfstools -x check boot.vmdk), I've seen some weird behaviour with corrupt VMDK files.

To that connect via SSH, go to the location of the VM files (/vmfs/volumes/$volumename/$vmname) and run the command there.

If that doesn't show any problems you can either edit the .vmx file manually to increase the memory (deregister the VM before you do that and register it again afterwards) or you can recreate the VM with the existing disks and the needed amount of memory.

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