3Ware 9550SXU16MLB10 User Guide - Page 17

RAID 50, Single Disk, JBOD, as available units.

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Understanding RAID When drives are configured as a striped mirrored array, the disks are configured using both RAID 0 and RAID 1 techniques, thus the name RAID 10 (see Figure 4). A minimum of four drives are required to use this technique. The first two drives are mirrored as a fault tolerant array using RAID 1. The third and fourth drives are mirrored as a second fault tolerant array using RAID 1. The two mirrored arrays are then grouped as a striped RAID 0 array using a two tier structure. Higher data transfer rates are achieved by leveraging TwinStor and striping the arrays. RAID 10 is available on the four, eight, and twelve port 3ware Serial ATA RAID Controllers. Figure 4. RAID 10 Configuration Example RAID 50 This array is a combination of RAID 5 with RAID 0. This array type provides fault tolerance and high performance. Requires a minimum of six drives. Several combinations are available with RAID 50. For example, on a 12-port controller, you can have a grouping of 3, 4, or 6 drives. A grouping of 3 means that the RAID 5 arrays used have 3 disks each; four of these 3-drive RAID 5 arrays are striped together to form the 12-drive RAID 50 array. Single Disk A single drive that has been configured as a unit through 3ware software. (3BM, 3DM 2, or CLI). Like disks in other RAID configurations, single disks contain 3ware Disk Control Block (DCB) information and are seen by the OS as available units. Single drives are not fault tolerant and therefore not recommended for high availability systems unless additional precautions are take to prevent system hangs and data loss. JBOD A JBOD is an unconfigured disk attached to your 3ware RAID controller. JBOD configuration is no longer supported in the 3ware 9000 series. AMCC recommends that you use Single Disk as a replacement for JBOD, to take advantage of advanced features such as caching, OCE, and RLM. www.3ware.com 11

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Understanding RAID
www.3ware.com
11
When drives are configured as a striped mirrored array, the disks are
configured using both RAID 0 and RAID 1 techniques, thus the name RAID
10 (see Figure 4). A minimum of four drives are required to use this
technique. The first two drives are mirrored as a fault tolerant array using
RAID 1. The third and fourth drives are mirrored as a second fault tolerant
array using RAID 1. The two mirrored arrays are then grouped as a striped
RAID 0 array using a two tier structure. Higher data transfer rates are
achieved by leveraging TwinStor and striping the arrays. RAID 10 is available
on the four, eight, and twelve port 3ware Serial ATA RAID Controllers.
Figure 4. RAID 10 Configuration Example
RAID 50
This array is a combination of RAID 5 with RAID 0. This array type provides
fault tolerance and high performance. Requires a minimum of six drives.
Several combinations are available with RAID 50. For example, on a 12-port
controller, you can have a grouping of 3, 4, or 6 drives. A grouping of 3 means
that the RAID 5 arrays used have 3 disks each; four of these 3-drive RAID 5
arrays are striped together to form the 12-drive RAID 50 array.
Single Disk
A single drive that has been configured as a unit through 3ware software.
(3BM, 3DM 2, or CLI). Like disks in other RAID configurations, single disks
contain 3ware Disk Control Block (DCB) information and are seen by the OS
as available units.
Single drives are not fault tolerant and therefore not recommended for high
availability systems unless additional precautions are take to prevent system
hangs and data loss.
JBOD
A JBOD is an unconfigured disk attached to your 3ware RAID controller.
JBOD configuration is no longer supported in the 3ware 9000 series. AMCC
recommends that you use Single Disk as a replacement for JBOD, to take
advantage of advanced features such as caching, OCE, and RLM.