# 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 MD_RAID6_PQ
+ 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"
- 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.
-
- 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
- newer mdadm takes a copy of the data in the critical section
- and will restore it, if necessary, after a crash.
-
- The mdadm usage is e.g.
- mdadm --grow /dev/md1 --raid-disks=6
- to grow '/dev/md1' to having 6 disks.
-
- Note: The array can only be expanded, not contracted.
- There should be enough spares already present to make the new
- array workable.
-
- If unsure, say Y.
+config MD_RAID6_PQ
+ tristate
config MD_MULTIPATH
tristate "Multipath I/O support"
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---
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.
-endmenu
+ If unsure, say N.
+
+config DM_UEVENT
+ bool "DM uevents (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ Generate udev events for DM events.
-endif
+endif # MD