This is a message of severity level "info" , being issued for information purpose only. No need to worry about this message.
What this means is that the volume where the LUN resides is not designated for thin provisioning, as the volume itself is already thin provisioned. Please note that if the volume is created with space guarantee set to "none", that volume, and the files created within it including LUNs, will be all thin provisioned. For now, you can ignore this message.
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