Storage type & snapshot

Hello everyone.
I have an HP server with 2 storage volumes.
On the first one, I installed Proxmox VE and I use the second one for storage.
For this second volume, I followed a procedure to create a :
- new GPT table
- create primary partition in ext4 (parted)
- create volume group (vgcreate)
- create logical volume (lvcreate)
- format in ext4 (mkfs.ext4)
- mount volume
So far, so good, but I can't create snapshots. I have the message "The current guest configuration does not support...

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