ESXi6 - VM Stun while extending thick eager zero disk

[kotiadinesh]

Hello,

There a know bug in ESXi6.0 which causes virtual machine stun while extending thick eager disk.

As per below link, I tried to convert the disk to lazy zero before extending it.

VMware KB: Extending an eager-zeroed virtual disk causes virtual machine stun in ESXi 6.0 GA/ 6.0 U1

But even after svmotion with converting a disk to lazy zero, it was showing thick zero in vCenter, web client and command line. I then proceeded to extend a disk from 50GB to 100GB which cause my VM to stun.

Is there any other workaround to extend a thick eager zero disk without causing a vm to stun in ESXi6?

[kotiadinesh]

It is confirmed with VMware that converting thick eager zero to lazy zero has issue in ESXi 6.0U1a and is resolved in update 1b.

The workaround of the issue is:

• svmotion thick eager zero disk to any other datastore and change the type to thin during svmotion.
• Verify the type is thin
• Now extend a disk
• Again svmotion the disk to original datastore and this time change the type as thick eager zero

You will get the option to change the disk type under advanced settings during svmotion.