RAID 0 – striping – stores data accross several disks, (100 GB drive + 100 GB drive becomes a 200 GB appearing as 1 hard drive icon) improves speed when writing to the drives because it writes to both drives at the same time.
RAID 1 – mirroring — uses the drive to be a redundant copy of the information, provides a back-up if one drive fails.
Disk Utility does not support any other software RAID schemes. However, the XServe RAID rack mountable drive bay delivers additional hardware RAID options.
it is still possible to host your sitemap on external S3 buckets. You must set up a subdomain of your domain pointed as an Alternative Domain Name for your CloudFront distribution, and in order to do this you must go through domain verification with AWS.