More or less. XFS or ext2 (or 3 or 4 wo journal), without LVM or mdraid. There's no point to adding RAID at the hardware or OS level for object storage boxes

More or less. XFS or ext2 (or 3 or 4 wo journal), without LVM or mdraid. There's no point to adding RAID at the hardware or OS level for object storage boxes when redundancy exists at the application level. A drive with too many errors will be marked "dead" and just spun down and ignored. Metadata servers OTOH tend to be engineered to be much more reliable beasts.