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RAID 10: How many disk drives should you use? The minimum number of drives required for RAID 10 is four. RAID 10 disk drives are a combination of RAID 1 and RAID 0, the first step of which is to create a number of RAID 1 volumes by mirroring two drives together (RAID 1). The second step involves creating a stripe set with these mirrored pairs (RAID 0). In its original form this was called RAID 1+0, but has been abbreviated to RAID 10.
Figure 11.3 Writing Data to a RAID-5 Volume. Implementing a RAID-5 volume requires a minimum of three and a maximum of 32 disks in the set. The physical disks do not need to be identical. However, there must be equal size blocks of unused space available on each physical disk in the set. The disks can be on the same or different controllers. As with striped volumes, you cannot add disks to a RAID-5 volume if you need to increase the size of the volume later. If one of the disks in a RAID-5 volume fails, none of the data is lost. When a read operation requires data from the failed disk, the system reads all of the remaining good data stripes in the stripe and the parity stripe. Each data stripe is subtracted (with XOR) from the parity stripe; the order is not important.