EMC Unity550F, Is it safe to perform a conversion of a LUN from Thin to Thick using the Move request in the EMC Unity550F? These are VMware VMFS Luns that have VM's on them.

JB Blanco
JB Blanco used Ask the Experts™
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EMC Unity550F, Is it safe to perform a conversion of a LUN from Thin to Thick using the Move request in the EMC Unity550F?  These are VMware VMFS Luns that have VM's on them.  

I was thinking I should first Storage Vmotion them off this lun before I do the conversion.  But I wanted to check here if someone can confirm it is safe to do the conversion while there are VM's on the LUN.

Please can anyone confirm?

EMC Unity 550F
VMware Vcenter 6.5
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JB BlancoSr Systems Engineer

Author

Commented:
Just an FYI, the Luns are not being migrated to another storage pool.. They are staying on the same storage pool they are currently in.  Just changing the provisioning from Thin to Thick.
nociSoftware Engineer
Distinguished Expert 2018

Commented:
And it will cause all blocks which are not allocated yet because the values is known (a block full of 0 values) be allocated from storage and filled with 0's and assigned to the LUN.  (more or less the same as writing all "unused" space on the disk with 0's from within the VM.
JB BlancoSr Systems Engineer

Author

Commented:
And it will cause all blocks which are not allocated yet because the values is known (a block full of 0 values) be allocated from storage and filled with 0's and assigned to the LUN.  (more or less the same as writing all "unused" space on the disk with 0's from within the VM.

Im sorry, thanks for that detailed explanation, but i just need a defiinite answer, yes or no to my question.  I feel like it wont dammage any data at all, but I just want to be sure.   I can always storage vmotion the vm's and make the, change and then move them back, but if its not necessary, i dont want to.
Software Engineer
Distinguished Expert 2018
Commented:
I have no access to VMware at the moment. So i can't help you there to verify procedures.

What you can do is fill the disk (all unused data) areas) with random data until the disk fills and then remove all that again.
Then your disk is Thick allocated (it won;t release all blocks if you remove the files from within the system).

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