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Diffstat (limited to 'drivers/md/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index bf1a95e3..98d9ec8 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -240,6 +240,30 @@ config DM_MIRROR Allow volume managers to mirror logical volumes, also needed for live data migration tools such as 'pvmove'. +config DM_RAID + tristate "RAID 4/5/6 target (EXPERIMENTAL)" + depends on BLK_DEV_DM && EXPERIMENTAL + select MD_RAID456 + select BLK_DEV_MD + ---help--- + A dm target that supports RAID4, RAID5 and RAID6 mappings + + A RAID-5 set of N drives with a capacity of C MB per drive provides + the capacity of C * (N - 1) MB, and protects against a failure + of a single drive. For a given sector (row) number, (N - 1) drives + contain data sectors, and one drive contains the parity protection. + For a RAID-4 set, the parity blocks are present on a single drive, + while a RAID-5 set distributes the parity across the drives in one + of the available parity distribution methods. + + A RAID-6 set of N drives with a capacity of C MB per drive + provides the capacity of C * (N - 2) MB, and protects + against a failure of any two drives. For a given sector + (row) number, (N - 2) drives contain data sectors, and two + drives contains two independent redundancy syndromes. Like + RAID-5, RAID-6 distributes the syndromes across the drives + in one of the available parity distribution methods. + config DM_LOG_USERSPACE tristate "Mirror userspace logging (EXPERIMENTAL)" depends on DM_MIRROR && EXPERIMENTAL && NET |