HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 87
Stage 3: High Data Storage, High Data Storage
View all HP Surestore Disk Array FC60 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 87 highlights
Concepts and Management Disk Array Features Stage 3: High Data Storage As the disk array nears its maximum storage capacity, most data is stored in RAID 5. The array always reserves a certain amount of capacity for RAID 0/1 to maintain an adequate level of performance. The disk array continues to try to keep the most recently updated data in RAID 0/1, but if the array is near maximum capacity this becomes more difficult. As long as the disk array can continue to service most writes from RAID 0/1, performance is maintained. But if the number of writes exceeds the current available RAID 0/1 space, the disk array must begin servicing writes from RAID 5 and performance begins to suffer. When data residing in RAID 5 must be updated, it is usually necessary to move the data to RAID 0/1 before performing the write. Figure 20. High Data Storage 87 Concepts