Earlier this month, a company came along and asked for a RAID 10 array. Understanding that RAID 10 is a cooler sounding way of saying RAID 1+0, I understood it as a mirror set that is striped across another mirror set. Simple enough… Just concatenate a couple of mirrors, and you’ve got RAID 10.
RAID 1 creates an exact copy (or mirror) of all of data on two or more disks, while RAID 0 splits data evenly across two or more disks with no parity information for redundancy. By combining the two into a RAID 10 array, you are able to take advantage of the faster write speed offered by RAID 0, while protecting your data against drive failures with mirroring.
This method of RAID is pretty costly, but useful if you find yourself in a situation where you need a lot of throughput combined with a lot of data protection.