Adaptec 2130SLP User Guide - Page 166
RAID 1 Logical Drives
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Appendix D: Understanding RAID ● 165 RAID 1 Logical Drives A RAID 1 logical drive is built from two disk drives, where one disk drive is a mirror of the other (the same data is stored on each disk drive). Compared to independent disk drives, RAID 1 logical drives provide improved performance, with twice the read rate and an equal write rate of single disks. However, capacity is only 50 percent of independent disk drives. If the RAID 1 logical drive is built from different- sized disk drives, the free space, drive segment size is the size of the smaller disk drive, as shown below. Disk Drive 1 250 GB Drive Segment Size (Smaller Disk Drive) Disk Drive 1 1 - 250 Disk Drive 2 400 GB Disk Drives in Logical Drive Disk Drive 2 1 - 250 Not Used Unused Space: 150 GB RAID 1 Logical Drive = 250 GB