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Relentim
Contributor
Contributor

Thick to thin VM with RDMs

vSphere 5 Build 455964

vCenter 5 Build 455964

NetApp FAS2040

I have an exchange server with 1 VMDK and 3 RDMs.

The VMDK is thick provisioned and I would like to change this to thin provisioned without any downtime.

Can anyone confirm this is the correct procedure?

  1. Log into vCenter
  2. Right click VM > Migrate
  3. Change Datastore > Next
  4. Advanced Button
  5. Do not change any details for RDMs or configuration file
  6. For VMDK, pick new datastore and change disk format to Thin Provisioned
  7. Next > Finish
  8. Repeat steps to move VMDK back to original datastore

Thanks.

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jimraina
Enthusiast
Enthusiast

HI

if it sounds good , but please take some down time from operation for safty purpose .so that things should not go in hurry and safe from silly mistakes.

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Relentim
Contributor
Contributor

I'm plainning to do it out of our main office hours however email is used 24/7.

Slightly annoying is vCenter will not migrate thick to thin unless the taget datastore has enough room for the thick VMDK.

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Relentim
Contributor
Contributor

These steps worked perfectly with no down time.

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