HP 166207-B21 Advanced Data Guarding Option Software Reference Guide - Page 12

Overview of RAID ADG Choosing a RAID Method There are three primary reasons for using RAID ADG: • You need greater fault tolerance than RAID 5 can provide but you also want to use as much drive space as possible for data. • You need to use a greater percentage of drive space for data than with RAID 1+0 while maintaining a high level of fault tolerance. • You need a large logical volume, incorporating over ten hard drives. Table 1-2 may help you to decide which RAID option is best for your situation. Table 1-2: Choosing a RAID Method Most Important Fault tolerance Cost effectiveness Also Important Cost effectiveness I/O performance Fault tolerance I/O performance I/O performance Cost effectiveness Fault tolerance Suggested RAID Level RAID ADG RAID 1+0 RAID ADG RAID 5 (RAID 0 if fault tolerance is not required) RAID 5 (RAID 0 if fault tolerance is not required) RAID 1+0 Compaq Advanced Data Guarding Option Software Reference Guide 1-5