HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 56
Volume Group, Configuration, Relative Read Performance, for Large Sequential Access
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Table 3 RAID Level Comparison: Relative Performance Compared to an Individual Disk* Volume Group 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 volume group increases as the multiple of the number of disks in the volume group. For example, a 4-disk RAID 0 volume group 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. 56 Disk Array High Availability Features