We’re converting thin-provisioned luns to thick provisioned and it seems that to do that, we need extra storage space assigned to the volumes containing the luns.
Example. a 450GB thin-provisioned lun requires around 620GB size volume to be able to convert it from thin to thick.
Each volume has one lun and when we convert the luns from thin to thick provisioning, it needed ~250GB added to the volume to be able to complete successfully.
Right now the extra storage is less because I had the user run space reclamation and resized the volume, but it is still more than what they need. All they need is 450GB lun and the volume needs about 620GB to host a 450GB lun.
Could someone please explain this to me.
LUN Filer LUN Size (GB) Thick provisioned
UN19 nas5 460 no
UN20 nas5 470 no
UN24 nas5 450 no
UN28 nas5 450 no
UN29 nas5 450 no
UN30 nas5 450 no
UN31 nas5 450 no
Thank you in advance.