HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 86
Stage 2: Moderate Data Storage, Concepts and Management
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Concepts and Management Disk Array Features Stage 2: Moderate Data Storage As more data is stored, a point is reached where it becomes necessary for the disk array to begin moving or migrating data from RAID 0/1 to RAID 5. Because RAID 5 is more storage efficient, this migration frees up capacity for more data. The more full the array gets, the larger the percentage of data stored in RAID 5 becomes. The disk array examines all data and moves it to RAID 5 only if it has not been updated recently. Write I/Os are serviced faster from RAID 0/1, so this technique helps maintain disk array performance by keeping data that has the highest probability of changing in RAID 0/1. Read I/Os are serviced just as quickly from RAID 5 as from RAID 0/1, so moving data that may only be read to RAID 5 has little impact on performance. Figure 19. Moderate Data Storage 86 Concepts