# 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
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
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
If unsure, say Y.
-config MD_RAID5
- tristate "RAID-4/RAID-5 mode"
+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
+ select ASYNC_PQ
+ select ASYNC_RAID6_RECOV
---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
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.
+
Information about Software RAID on Linux is contained in the
Software-RAID mini-HOWTO, available from
<http://www.tldp.org/docs.html#howto>. There you will also
learn where to get the supporting user space utilities raidtools.
- If you want to use such a RAID-4/RAID-5 set, say Y. To
+ If you want to use such a RAID-4/RAID-5/RAID-6 set, say Y. To
compile this code as a module, choose M here: the module
- will be called raid5.
+ will be called raid456.
If unsure, say Y.
-config MD_RAID6
- tristate "RAID-6 mode"
- depends on BLK_DEV_MD
+config MULTICORE_RAID456
+ bool "RAID-4/RAID-5/RAID-6 Multicore processing (EXPERIMENTAL)"
+ depends on MD_RAID456
+ depends on SMP
+ depends on EXPERIMENTAL
---help---
- 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.
+ Enable the raid456 module to dispatch per-stripe raid operations to a
+ thread pool.
- RAID-6 requires mdadm-1.5.0 or later, available at:
+ If unsure, say N.
- ftp://ftp.kernel.org/pub/linux/utils/raid/mdadm/
+config MD_RAID6_PQ
+ tristate
- If you want to use such a RAID-6 set, say Y. To compile
- this code as a module, choose M here: the module will be
- called raid6.
+config ASYNC_RAID6_TEST
+ tristate "Self test for hardware accelerated raid6 recovery"
+ depends on MD_RAID6_PQ
+ select ASYNC_RAID6_RECOV
+ ---help---
+ This is a one-shot self test that permutes through the
+ recovery of all the possible two disk failure scenarios for a
+ N-disk array. Recovery is performed with the asynchronous
+ raid6 recovery routines, and will optionally use an offload
+ engine if one is available.
- If unsure, say Y.
+ If unsure, say N.
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
If unsure, say N.
+config DM_DEBUG
+ boolean "Device mapper debugging support"
+ depends on BLK_DEV_DM
+ ---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
+ 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 writeable snapshots of a device.
+ 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_LOG_USERSPACE
+ tristate "Mirror userspace logging (EXPERIMENTAL)"
+ depends on DM_MIRROR && EXPERIMENTAL && NET
+ select CONNECTOR
+ ---help---
+ The userspace logging module provides a mechanism for
+ relaying the dm-dirty-log API to userspace. Log designs
+ which are more suited to userspace implementation (e.g.
+ shared storage logs) or experimental logs can be implemented
+ by leveraging this framework.
+
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_MULTIPATH_QL
+ tristate "I/O Path Selector based on the number of in-flight I/Os"
+ depends on DM_MULTIPATH
---help---
- Multipath support for EMC CX/AX series hardware.
+ This path selector is a dynamic load balancer which selects
+ the path with the least number of in-flight I/Os.
-endmenu
+ If unsure, say N.
+
+config DM_MULTIPATH_ST
+ tristate "I/O Path Selector based on the service time"
+ depends on DM_MULTIPATH
+ ---help---
+ This path selector is a dynamic load balancer which selects
+ the path expected to complete the incoming I/O in the shortest
+ time.
+
+ If unsure, say N.
+
+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.
+
+config DM_UEVENT
+ bool "DM uevents (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ Generate udev events for DM events.
+endif # MD
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff