3Ware 9550SX-4LP User Guide - Page 20
Drive Capacity Considerations, Table 3: Possible Configurations Based on # of Drives - user guide
UPC - 693494960044
View all 3Ware 9550SX-4LP manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 20 highlights
Chapter 1. Introducing the 3ware® 9000 Series Controller Table 3: Possible Configurations Based on # of Drives # Drives Possible RAID Configurations 1 2 3 4 5 6 or more Single drive or hot spare RAID 0 or RAID 1 RAID 0 RAID 1 with hot spare RAID 5 RAID 5 + hot spare RAID 10 Combination of RAID 0, RAID 1, single disk RAID 5 + hot spare RAID 10 + hot spare Combination of RAID 0, RAID 1, hot spare, for single disk RAID 50 Depending on the number of drives, a RAID 50 may contain from 2 to 4 subunits. For example, with 12 drives, possible RAID 50 configurations include 2 subunits of 6, 3 subunits of 4, or 4 subunits of 3. With 10 drives, a RAID 50 will contain 2 subunits of 5 drives each. With 16 drives, a RAID 50 will contain 2 subunits of 8 drives or 4 subunits of 4 drives. Combination of RAID 0, 1, 5, 10, hot spare, and single disk Drive Capacity Considerations The capacity of each drive is limited to the capacity of the smallest drive in the array. The total array capacity is defined as follows: Table 4: Drive Capacity RAID Level Capacity RAID 0 RAID 1 RAID 5 (number of drives) X (capacity of the smallest drive) capacity of the smallest drive (number of drives - 1) X (capacity of the smallest drive) RAID 10 Storage efficiency increases with the number of disks: storage efficiency = (number of drives -1)/(number of drives) (number of drives / 2) X (capacity of smallest drive) 10 3ware Serial ATA RAID Controller User Guide