Dell POWEREDGE RADI H700 Technical Manual

Also see for PERC H700: User guide Installation and Removal Instructions

Dell POWEREDGE RADI H700 Technical Manual Manual pdf 25 page image

DellDELL PERC H700 and H800 Technical Guide 25Figure 7. Example of RAID 6 (Single Virtual Disk with 5 drives)Advantages of RAID 6 Can survive the loss of two disks without losing data Data redundancy, high read rates, and good performanceDisadvantages of RAID 6 Requires two sets of parity data for each write operation, resulting in significant decrease inwrite performance Additional costs because of the extra capacity required by using two parity blocks per stripe Retrieval of parity information after a drive failure takes longer than with mirroring5.3.5 RAID 10 (Striping over Mirrored Sets)RAID 10 combines striping and mirroring to produce large virtual disks with high performance andfault-tolerance. The performance gain comes from striping across mirror sets without the need forparity calculations. See Figure 8.Although this delivers the highest performance, the drive storage overhead is 100 percent becausethe entire virtual disk is mirrored. This is an excellent solution for sites that require the highest levelof performance and redundancy, as well as the fastest recovery of data after a drive failure.Drive 1 Drive 2 Drive 3 Drive 4 Drive 5ParityGeneration Q parityQ parityQ parityQ parityQ parityData 1 Data 2 Data 3 P parityData 5 Data 6 P parity Data 8Data 9 P parity Data 11 Data 12P parity Data 14 Data 16Data 15Data 18 P parityData 17 Data 19