Explain Raid 5+0 (50) (Striping of RAID 5 logical drives)
- RAID 50 is a combination of two basic RAID techniques. It combines striping (RAID 0) with independent data disks with distributed parity (RAID 5). It stripes data across at least two RAID 5 arrays. The easy way to think of RAID 50 is as RAID 5 with an extra pair of suspenders. RAID 50 offers increased write performance and better data protection, including faster rebuilds, than RAID 5 in the event of a disk failure. While performance degrades in the event of a disk failure, it doesn't degrade as much as it would in a RAID 5 array because a single failure only affects one of the arrays, leaving the other fully functional. In fact, RAID 50 can sustain up to four drive failures if each failed disk is in a different RAID 5 array.
- RAID 50 is best used for applications that need high reliability, and that need to handle high request rates and high data transfer with lower cost of disks than a RAID-10. This type consists of a series of RAID-5 groups and striped in RAID-0 fashion to improve RAID-5 performance without reducing data protection.
- RAID 0+5 or RAID 50 is a combination of RAID levels that utilizes multiple RAID 5 sets striped in a single array. In a RAID 0+5 array, a single hard drive failure can occur in each of the RAID 5 sides without any loss of data on the entire array. If, however more than one disk is lost in any of the RAID 5 arrays all the data in the array is lost. As the number of hard drives increase in an array, so does the possibility of a single hard drive failure. Although there is an increased write performance in RAID 0+5, once a hard drive fails and reconstruction takes place, there is a noticeable decrease in performance, data/program access will be slower, and transfer speeds on the array will be effected.