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Knowledge Base

Unable to power ON Virtual machine with Error: Failed to power on the virtual machine. Cannot create Flash Read Cache: Operation failed. (66927)

Last Updated: 3/30/2020Categories: TroubleshootingTotal Views: 23543Language:
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Symptoms

Failed to power on the virtual machine. Cannot create Flash Read Cache: Operation failed.
You might get the error related to  "The "Power on virtual machine" operation failed for the entity with the following error message. The available virtual flash resource '0' MB ('0' bytes) is not sufficient for the requested operation.

Cause

The SSD drive used as vFlash Read Cache (vFRC) was removed from ESXi host in which a VM has been registered and configured to use vFRC, in the absence of SSD card a power-on operation of VM will fail.

Impact / Risks

VM will not power ON

Resolution

To power-on, the affected VM, perform below task,

Change the value from TRUE to FALSE for vFlash entry

Before you edit the vmx file, take a backup of vmx file.

# cp <VM>vmx <VM>.vmx.backup

Use vi editor to change the disk value
# vi <VM>.vmx
sched.scsi0:0.vFlash.enabled = "TRUE" and change to  "FALSE"

Suppose if the VM has many disks and you wanted to change the value for all the disk then use the sed command to change the value. For each vmdk file that is configured to use vFRC, there is a corresponding entry in the vmx file, that controls vFRC.

In order to turn off vFRC acceleration for a given disk, download the vmx file, and change the value for .vFlash.enabled from TRUE to FALSE

Example:
sched.scsi0:0.vFlash.enabled = "TRUE"
sched.scsi0:0.vFlash.enabled = "FALSE"

1. List out all the disk which has vFRC enabled

#  cat <VM>.vmx | grep -i flash.enabled
sched.scsi0:3.vFlash.enabled = "TRUE"
sched.scsi0:5.vFlash.enabled = "TRUE"
sched.scsi0:11.vFlash.enabled = "TRUE"
sched.scsi0:12.vFlash.enabled = "TRUE"

2. Take a backup of the VMX file
# cp <VM>vmx <VM>.vmx.backup

3. Use the below command to change the value from TRUE to FALSE
# sed -i 's/vFlash.enabled = "TRUE"/vFlash.enabled = "FALSE"/g' <VM>.vmx

4. Confirm the changed which you have performed
#cat <VM>.vmx | grep -i flash.enabled
sched.scsi0:3.vFlash.enabled = "FALSE"
sched.scsi0:5.vFlash.enabled = "FALSE"
sched.scsi0:11.vFlash.enabled = "FALSE"
sched.scsi0:12.vFlash.enabled = "FALSE"

5. after editing the VMX file, you need to reload the VM from command line or else from GUI

Command line
vim-cmd vmsvc/getallvms | grep -i <vmname>
vim-cmd vmsvc/reload <VMDI> which is noted in the above command

GUI
Select the VM in the inventory and unregister and register the VM back from datastore.

Now, try to POWER ON Virtual machine.

6. VM will be powered ON

Perform the same task for the VM which encounter the same problem.

Detectable by VMware SkylineTM

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Attachments

Additional Resources

KB
•
End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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•
VDP アップグレード ISO が検出されない (66992)

KB
•
Download and Install VMware Fusion (2014097)

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