HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 58
Table 2, RAID Level, Storage Efficiency, LUN Configuration, Relative Read Performance
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Table 2 RAID Level Comparison: Storage Efficiency Characteristics RAID Level Storage Efficiency RAID 0 100%. All disk space is use for data storage. RAID 1 and 0/1 50%. All data is duplicated, requiring twice the disk storage for a given amount of data capacity. RAID 3 and 5 One disk's worth of capacity from each LUN is required to store parity data. As the number of disks in the LUN increases, so does the storage efficiency. 3-disk LUN: 66% 4-disk LUN: 75% 5-disk LUN: 80% 6-disk LUN: 83% Table 3 RAID Level Comparison: Relative Performance Compared to an Individual Disk* LUN Configuration Relative Read Performance Relative Write Performance for Large Sequential Access for Large Sequential Access RAID 0 The read and write performance of a RAID 0 LUN increases as the multiple of the number of disks in the LUN. For example, a 4-disk RAID 0 LUN will achieve close to four times the performance of a single disk. RAID 1 mirrored pair Up to 2.0 > than single disk Equal to single disk RAID 0/1 group with 10 disks Up to 10.0 > than single disk Up to 5.0 > than single disk RAID 0/1 group with 6 disks Up to 6.0 > than single disk Up to 3.0 > than single disk RAID 3 group with 5 disks Up to 4.0 > than single disk Up to 1.25 > than single disk RAID-5 group with 5 disks Up to 4.0 > than single disk Up to 1.25 > than single disk * Compares the relative read and write performance for array configurations with the performance of a single stand-alone disk whose performance is 1.0. The read and write performance shown is the theoretical maximum performance relative to individual disk performance. The performance numbers are not based on read/write caching. With caching, the performance numbers for RAID 5 writes improve significantly. 58 Disk Array High Availability Features