Server Products
Intel® RAID Controllers
RAID Levels Support by Intel SAS/SATA RAID Controllers

Intel® RAID Controllers support all, or a combination of RAID levels 0, 1, 5, 6, 10, 50, and 60. Specific controller RAID level support should be verified in the controller technical product specification or hardware user's guide before purchasing or configuration decisions are made.

SRCSAS18E x x x x x
SRCSAS144E x x x x x
SRCSASJV x x x x x x x
SRCSASRB x x x x x x x
SRCSASBB8I x x x x x x x
SRCSASLS4I x x x x x x x
SRCSASPH16I x x x x x x x
RS2BL040 x x x x x x x
RS2BL080 x x x x x x x
RS2MB044 x x x x x x x
RS2PI008 x x x x x x x
RS2WC040 x x x x x
RS2WC080 x x x x x
RS2WG160 x x x x x x x
RS2SG244 x x x x x x x
RT3WB080 x x x x x x x
RS25DB080 x x x x x x x
RS25GB008 * * * * * * *
RS2VB080 x x x x x x x
RS2VB040 x x x x x x x
RS25NB008 x x x x x x x
RS25AB080 x x x x x x x
RS25SB008 x x x x x x x
RCS25ZB040 x x x x x x x
RCS25ZB040LX x x x x x x x
RS3FC044 x x x (10/1E)
RS3GC008 x x x (10/1E)
RS3UC080 x x x (10/1E)
RS3WC080 x x x x x
RS3DC040 x x x x x x x
RS3DC080 x x x x x x x
RS3SC008 x x x x x x x
Note The Intel® RAID Controller RS25GB008 is an IT (integrated target) mode controller. IT mode is native SAS mode without RAID function.

See below for a short description of these RAID types.

Detailed descriptions of RAID types, the fault tolerance capabilities, performance characteristics, and capacity details can be found in the detailed RAID level descriptions Web article.

Additional details can be found in the Intel® RAID Controller Software User's Guide.

Level 0: often called "striping," RAID 0 is a performance-oriented data mapping technique. Data written to the array are divided into stripes and written across the disks of the array. This procedure enables high I/O performance at a low cost but provides no redundancy.

Level 1: often called "mirroring," RAID 1 provides redundancy by writing identical data to each member disk of the array. It operates with two disks that may use parallel access for high data-transfer rates when reading, but more commonly operates independently to provide high I/O transaction rates. Level 1 provides very good data reliability and improves performance for read-intensive applications but at a relatively high cost. Minimum number of drives is two.

Level 5: often called "striping with parity," RAID 5 provides redundancy with parity data distributed across all member disks. In the event of a single disk failure, the array can be recovered from the data and parity information on the remaining disks. RAID 5 implementations suffer from poor performance when faced with a workload which includes many writes which are smaller than the capacity of a single stripe. This is because parity must be updated on each write. Minimum number of drives is three.

Level 6: often called "block-level striping with double distributed parity," RAID 6 provides fault tolerance from two drive failures. The array continues to operate with up to two failed drives. This makes larger RAID groups more practical, especially for high-availability systems. RAID 6 does not have a performance penalty for read operations, but it does have a performance penalty on write operations because of the overhead associated with parity calculations. Minimum number of drives is four.

Level 10: often called "striped mirrors", redundancy is provided by the fact that all but one drive from each RAID 1 set could fail without damaging the data. RAID 10 provides good to excellent overall performance by combining the speed of RAID 0 with the redundancy of RAID 1 without requiring parity calculations. Minimum number of drives is four (two mirrored sets).

Level 1E: RAID level 1 "Enhanced", or RAID level 1E, combines mirroring and data striping. This RAID level stripes data and copies of the data across all of the drives in the array. As with the standard RAID level 1, the data is mirrored, and the capacity of the logical drive is 50% of the array capacity. RAID 1E supports 3 to 10 drives.

Level 50: RAID 50 combines the block-level striping of RAID 0 with the distributed parity of RAID 5. RAID 50 improves upon the performance of RAID 5 during writes, and provides better fault tolerance than a single RAID level does. A singe drive from each RAID 5 set could fail without data loss. RAID 50 requires a minimum of six drives.

Level 60: RAID 60 combines the block-level striping of RAID 0 with the distributed double parity of RAID 6. RAID 6 provides very good redundancy in that two disks from each of the RAID 6 sets could fail without loss of data. Also failures while a single disk is rebuilding in one RAID 6 set will not lead to data loss. Striping helps to increase capacity and performance without adding disks to each RAID 6 set. RAID 60 requires a minimum of eight drives.

Related topic
Intel® Server Boards and Intel® RAID adapter compatibility

This applies to:

Intel® RAID Controller RS25AB080
Intel® RAID Controller RS25DB080
Intel® RAID Controller RS25GB008
Intel® RAID Controller RS25NB008
Intel® RAID Controller RS25SB008
Intel® RAID Controller RS2BL040
Intel® RAID Controller RS2BL080
Intel® RAID Controller RS2MB044
Intel® RAID Controller RS2PI008
Intel® RAID Controller RS2SG244
Intel® RAID Controller RS2VB040
Intel® RAID Controller RS2VB080
Intel® RAID Controller RS2WC040
Intel® RAID Controller RS2WC080
Intel® RAID Controller RS2WG160
Intel® RAID Controller RS3DC040
Intel® RAID Controller RS3DC080
Intel® RAID Controller RS3SC008
Intel® RAID Controller RS3WC080
Intel® RAID Controller RT3WB080
Intel® RAID Controller SRCSAS144E
Intel® RAID Controller SRCSAS18E
Intel® RAID Controller SRCSASBB8I
Intel® RAID Controller SRCSASJV
Intel® RAID Controller SRCSASLS4I
Intel® RAID Controller SRCSASPH16I
Intel® RAID Controller SRCSASRB
Intel® RAID SSD Cache Controller RCS25ZB040
Intel® RAID SSD Cache Controller RCS25ZB040LX

Solution ID: CS-031788
Last Modified: 27-Oct-2014
Date Created: 04-Aug-2010
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