155The data capacity RAID 10 Volume equals the capacity of the smallest diskdrive times the number of disk drives, divided by two.In some cases, RAID 10 offers double fault tolerance, depending on which diskdrives fail.RAID 10 Volumes on this unit consist of four disk drives.Because all of the available disk drives are used for the RAID Volume, youcannot set up a spare drive with RAID 10.Choosing a RAID LevelThere are several issues to consider when choosing the RAID level. Thefollowing summarizes some advantages, disadvantages and applications foreach choice. RAID 0Advantage Disadvantage Implements a striped disk RAIDVolume, the data is broken downinto blocks and each block iswritten to a separate disk drive I/O performance is greatly Not a true RAID because it is notfault tolerant The failure of just one drive willresult in all data in a RAID Volume
