Hello Subhasish Bhattacharya
As you already stated, defrag has a bug for analyse process when disk is thin provisioned so we have to switch disk to redirected mode.
In my case it is worse that I am not possible to do defrag /a or Optimize-Volume -analyse in any mode except "Maintenance Mode" what is unacceptable for Hyper-V CSV disks.
When I run defrag /a in redirected mode I received "Slab Analysis: 0% complete..." and then "Incorrect function. (0x80070001)"
Powershell equivalent shows "The specified extrinsic Method does not exist."
Disk is thin provisioned.
When I tried Defrag GUI, analyse process doesn't work same way as optimize when in redirected mode.
Difference is for defrag.exe and powershell command where defrag itself works in redirected mode!
Problem is for SCOM or regular analyse checks which can never pass sucessfully on disks also in redirected mode.
Is this a known bug?
Thanks for your answer
BR
Filip