First, the Vault drives can not be used in a Pool.  Second, Raid 6 (two parity disks) provides the best protection, but also has a performance penalty. For SAS and SSD disks Raid 5 is usually best for both performance and protection. NL-SAS should use Raid 6.  I'd also recommend that you review the latest best practices guides for VNX with MCx available on support.emc.com in the Support By Product/VNX5400/White Papers area.  [URL]  [URL]  glen
We have just install a new VNX5400 with following configuration for storing ESXi 5/6 vmdk LUN and Oracle RAC LUN:- 1) 30 x 1 TB SAS Disks 2) 20 x 800 GB SSD Disks  We would like to maximize the usuable capacity as well as protection (allow more disk failure)  Which is a better choice? 1) RAID 1+0 2) RAID 5 (with 1 disk failure allowed) 3) RAID 6 (with 2 disk failure allowed)  Seems RAID 1+0 is good for performance, however, it lost half usuable capacity and disk sprindle. Or, should RAID 6 be better performance than RAID 1+0 in this situation???  Also,we notice the first 4 disks are RAID 5 OS disk, is it possible to ask Vendor to regroup them into a big storage pool????
VNX5400 Storage Pool Design