I am building a file server and need to protect data and also increase performance. We are currently using RAID 1 which is very slow, although it does protect against loss. What are your recommendations? Thanks.
That has plenty of information I'll summarize those 3 though.
RAID5: Minimum of 3 disks. Storage equal to ([Amount of disks] - 1) the disks. Fault tolerance of 1 disk.
RAID6: Minimum of 4 disks. Storage equal to ([Amount of disks] - 2) the disks. Fault tolerance of 2 disks.
RAID10: Minimum of 4 disks. Storage equal to half the total storage. Fault tolerance of 1 disk. Slight improvement in performance.
I didn't explain a whole lot I know; I suggest you read through ever level on that website (both single and nested), just so that you have a good understanding of what each level is. That's what I did, it won't take too much of your time.