Hello EdWilts, thank you for your reply.
Yes, you are right about the HA on ESXi Open Filer box, but my ideia is to keep this ESXi host out of HA.
The final solution will be.
(ESXi1 ---- ESXi2 ----- ESXi3 ------ESXn) in a HA ------> Connected in an Open Filer Shared Storage in a ESXi Server out of the Cluster.
Thanks for the RAID 6 tip, I'll take a look on it.