NOTE: Over the past few years, I have received a lot of messages and comments about this post.It is possible I did not make clear what I was trying to convey about RAID. What I am trying to say is that many people use a RAID as their primary storage system, and have it configured either as a RAID 1 or 5, thinking that the redundancy of the RAID is a backup. Among the Oracle engineer's hopes is that ZFS needs to become a 'first class citizen in Linux,' and to do so Oracle should port their ZFS code to Oracle Linux and then upstream the file-system to the Linux kernel, which would involve relicensing the ZFS code.