# Block device driver configuration
#
-if BLOCK
-
-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
If unsure, say N.
+config MD_AUTODETECT
+ bool "Autodetect RAID arrays during kernel boot"
+ depends on BLK_DEV_MD=y
+ default y
+ ---help---
+ If you say Y here, then the kernel will try to autodetect raid
+ arrays as part of its boot process.
+
+ If you don't use raid and say Y, this autodetection can cause
+ a several-second delay in the boot time due to various
+ synchronisation steps that are part of this step.
+
+ If unsure, say Y.
+
config MD_LINEAR
tristate "Linear (append) mode"
depends on BLK_DEV_MD
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_RAID456 && 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 version 2.4.1 or later to use this
feature safely. During the early stage of reshape there is
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
config DM_DEBUG
boolean "Device mapper debugging support"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ depends on BLK_DEV_DM
---help---
Enable this for messages that may help debug device-mapper problems.
config DM_CRYPT
tristate "Crypt target support"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ depends on BLK_DEV_DM
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
If unsure, say N.
config DM_SNAPSHOT
- tristate "Snapshot target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Snapshot target"
+ depends on BLK_DEV_DM
---help---
Allow volume managers to take writable snapshots of a device.
config DM_MIRROR
- tristate "Mirror target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Mirror target"
+ depends on BLK_DEV_DM
---help---
Allow volume managers to mirror logical volumes, also
needed for live data migration tools such as 'pvmove'.
config DM_ZERO
- tristate "Zero target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Zero target"
+ depends on BLK_DEV_DM
---help---
A target that discards writes, and returns all zeroes for
reads. Useful in some recovery situations.
config DM_MULTIPATH
- tristate "Multipath target (EXPERIMENTAL)"
- depends on BLK_DEV_DM && EXPERIMENTAL
+ tristate "Multipath target"
+ depends on BLK_DEV_DM
+ # nasty syntax but means make DM_MULTIPATH independent
+ # of SCSI_DH if the latter isn't defined but if
+ # it is, DM_MULTIPATH must depend on it. We get a build
+ # error if SCSI_DH=m and DM_MULTIPATH=y
+ depends on SCSI_DH || !SCSI_DH
---help---
Allow volume managers to support multipath hardware.
-config DM_MULTIPATH_EMC
- tristate "EMC CX/AX multipath support (EXPERIMENTAL)"
- depends on DM_MULTIPATH && BLK_DEV_DM && EXPERIMENTAL
+config DM_DELAY
+ tristate "I/O delaying target (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
---help---
- Multipath support for EMC CX/AX series hardware.
+ A target that delays reads and/or writes and can send
+ them to different devices. Useful for testing.
+
+ If unsure, say N.
-endmenu
+config DM_UEVENT
+ bool "DM uevents (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ Generate udev events for DM events.
-endif
+endif # MD
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