I have a query about the Vault drives / RAID Group 0

I have a customer with a VNX5300 with NL-SAS drives in the DPE. It came from the factory that way. Recently they upgraded the VNX with extra DAEs and a mixture of SAS and NL-SAS disks. Now they have Pools configured using all available disks.

They are now using Mirrorview/S with another VNX5300, and bi-directional replication. As all other disks are used in pools, the only option for the Write Intent Log is RAID Group 0 on the first 4 disks (Vault).

At present RAID Group 0 is configured as RAID-6 , but there are no LUNs defined in this group, and the disks show up as "Unbound" under Storage Hardware -> Disks. I really don't want to put the WIL on NL-SAS RAID-6, as I think that would be the worst option. Can I delete RAID Group 0 and re-create it with RAID1/0 ? If this were a normal RAID Group I would have no questions about it, but since they are the vault disks, I want to be sure. I would assume that user actions like deleting a RAID Group would have no effect on the vault, can you guys confirm this please?

Thanks in advance,

Stephen