Adaptec 1430SA User Guide - Page 49
RAID 0 (Non-RAID Arrays), I/O performance.
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Appendix A: Understanding RAID ● 49 When selecting a RAID level for your system, consider the following factors. RAID Level 0 1 10 Data Redundancy No Yes Yes Physical Drive Capacity Utilization 100% 50% 50% Read Write Built-In Performance Performance Spare Drive Superior Superior No Very high Very high No Very high Very high No Min Number of Drives 1 2 4 Max Number of Drives 4 2 4 Physical drive utilization, read performance, and write performance depend on the number of drives in the array. Generally, the more drives in the array, the better the performance. RAID 0 (Non-RAID Arrays) An array with RAID 0 includes two or more disk drives (maximum twelve) and provides data striping, where data is distributed evenly across the disk drives in equal-sized sections. RAID 0 arrays do not maintain redundant data, so they offer no data protection. However, compared to an equal-sized group of independent disks, a RAID 0 array provides improved I/O performance. Drive segment size is limited to the size of the smallest disk drive in the array. For instance, an array with two 250 GB disk drives and two 400 GB disk drives can create a RAID 0 drive segment of 250 GB, for a total of 1000 GB for the volume, as shown in the following figure. Disk Drive 1 250 GB Drive Segment Size (Smallest Disk Drive) Disk Drive 2 250 GB Disk Drive 3 400 GB Disk Drive 4 400 GB Disk Drives in Logical Drive Disk Drive 1 1 5 ... 997 Disk Drive 2 2 998 6 ... Disk Drive 3 Disk Drive 4 3 999 7 ... Not Used Unused Space: 150 GB 4 1000 8 ... Not Used Unused Space: 150 GB RAID 0 Logical Drive = 1000 GB