For simplification, not all packs are shown in Figure 4-48.  The use of multiple drives improves the rebuild process, which is up to 10 times faster than  traditional RAID. This speed is even more important when you use large drives. The conversion from traditional RAID to distributed RAID is possible by using volume  mirroring or volume migration. Mixing traditional RAID and distributed RAID in the same  storage pool is also possible. The same number of disks can be configured by using traditional or distributed RAID. In our  example, we use six disk drives and assign those disks as RAID 6 to a single pool.  Figure 4-49 shows the setup for a traditional RAID 6 environment. The pool consists of one  MDisk, with five disk drives. The spare drive is not listed in this summary.  Figure 4-48 Single drive failure with DRAID 6  Figure 4-49 Array configuration for a traditional RAID 6 with six disks Example 198  Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.2.1