# Block device driver configuration
#
-menu "Multi-device support (RAID and LVM)"
-
-config MD
+menuconfig MD
bool "Multiple devices driver support (RAID and LVM)"
+ depends on BLOCK
help
Support multiple physical spindles through a single logical device.
Required for RAID and logical volume management.
+if MD
+
config BLK_DEV_MD
tristate "RAID support"
- depends on MD
---help---
This driver lets you combine several hard disk partitions into one
logical block device. This can be used to simply append one
depends on BLK_DEV_MD && EXPERIMENTAL
---help---
RAID-10 provides a combination of striping (RAID-0) and
- mirroring (RAID-1) with easier configuration and more flexable
+ mirroring (RAID-1) with easier configuration and more flexible
layout.
Unlike RAID-0, but like RAID-1, RAID-10 requires all devices to
be the same size (or at least, only as much as the smallest device
config MD_RAID456
tristate "RAID-4/RAID-5/RAID-6 mode"
depends on BLK_DEV_MD
+ select ASYNC_MEMCPY
+ select ASYNC_XOR
---help---
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
If unsure, say Y.
config MD_RAID5_RESHAPE
- bool "Support adding drives to a raid-5 array (experimental)"
- depends on MD_RAID5 && EXPERIMENTAL
+ bool "Support adding drives to a raid-5 array"
+ depends on MD_RAID456
+ default y
---help---
A RAID-5 set can be expanded by adding extra drives. This
requires "restriping" the array which means (almost) every
block must be written to a different place.
This option allows such restriping to be done while the array
- is online. However it is still EXPERIMENTAL code. It should
- work, but please be sure that you have backups.
+ is online.
- You will need mdadm verion 2.4.1 or later to use this
+ You will need mdadm version 2.4.1 or later to use this
feature safely. During the early stage of reshape there is
a critical section where live data is being over-written. A
crash during this time needs extra care for recovery. The
There should be enough spares already present to make the new
array workable.
+ If unsure, say Y.
+
config MD_MULTIPATH
tristate "Multipath I/O support"
depends on BLK_DEV_MD
config BLK_DEV_DM
tristate "Device mapper support"
- depends on MD
---help---
Device-mapper is a low level volume manager. It works by allowing
people to specify mappings for ranges of logical sectors. Various
If unsure, say N.
+config DM_DEBUG
+ boolean "Device mapper debugging support"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ Enable this for messages that may help debug device-mapper problems.
+
+ If unsure, say N.
+
config DM_CRYPT
tristate "Crypt target support"
depends on BLK_DEV_DM && EXPERIMENTAL
select CRYPTO
+ select CRYPTO_CBC
---help---
This device-mapper target allows you to create a device that
transparently encrypts the data on it. You'll need to activate
tristate "Snapshot target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
---help---
- Allow volume managers to take writeable snapshots of a device.
+ Allow volume managers to take writable snapshots of a device.
config DM_MIRROR
tristate "Mirror target (EXPERIMENTAL)"
---help---
Multipath support for EMC CX/AX series hardware.
-endmenu
+config DM_MULTIPATH_RDAC
+ tristate "LSI/Engenio RDAC multipath support (EXPERIMENTAL)"
+ depends on DM_MULTIPATH && BLK_DEV_DM && SCSI && EXPERIMENTAL
+ ---help---
+ Multipath support for LSI/Engenio RDAC.
+
+config DM_DELAY
+ tristate "I/O delaying target (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ A target that delays reads and/or writes and can send
+ them to different devices. Useful for testing.
+
+ If unsure, say N.
+endif # MD