config BLK_DEV_MD
tristate "RAID support"
- ---help---
+ help
This driver lets you combine several hard disk partitions into one
logical block device. This can be used to simply append one
partition to another one or to combine several redundant hard disks
bool "Autodetect RAID arrays during kernel boot"
depends on BLK_DEV_MD=y
default y
- ---help---
+ help
If you say Y here, then the kernel will try to autodetect raid
arrays as part of its boot process.
config MD_LINEAR
tristate "Linear (append) mode"
depends on BLK_DEV_MD
- ---help---
+ help
If you say Y here, then your multiple devices driver will be able to
use the so-called linear mode, i.e. it will combine the hard disk
partitions by simply appending one to the other.
config MD_RAID0
tristate "RAID-0 (striping) mode"
depends on BLK_DEV_MD
- ---help---
+ help
If you say Y here, then your multiple devices driver will be able to
use the so-called raid0 mode, i.e. it will combine the hard disk
partitions into one logical device in such a fashion as to fill them
config MD_RAID1
tristate "RAID-1 (mirroring) mode"
depends on BLK_DEV_MD
- ---help---
+ help
A RAID-1 set consists of several disk drives which are exact copies
of each other. In the event of a mirror failure, the RAID driver
will continue to use the operational mirrors in the set, providing
config MD_RAID10
tristate "RAID-10 (mirrored striping) mode"
depends on BLK_DEV_MD
- ---help---
+ help
RAID-10 provides a combination of striping (RAID-0) and
mirroring (RAID-1) with easier configuration and more flexible
layout.
select ASYNC_XOR
select ASYNC_PQ
select ASYNC_RAID6_RECOV
- ---help---
+ 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
of a single drive. For a given sector (row) number, (N - 1) drives
depends on BLK_DEV_MD
depends on DLM
default n
- ---help---
+ help
Clustering support for MD devices. This enables locking and
synchronization across multiple systems on the cluster, so all
nodes in the cluster can access the MD devices simultaneously.
tristate "Device mapper support"
select BLK_DEV_DM_BUILTIN
depends on DAX || DAX=n
- ---help---
+ help
Device-mapper is a low level volume manager. It works by allowing
people to specify mappings for ranges of logical sectors. Various
mapping types are available, in addition people may write their own
config DM_DEBUG
bool "Device mapper debugging support"
depends on BLK_DEV_DM
- ---help---
+ help
Enable this for messages that may help debug device-mapper problems.
If unsure, say N.
config DM_BUFIO
tristate
depends on BLK_DEV_DM
- ---help---
+ help
This interface allows you to do buffered I/O on a device and acts
as a cache, holding recently-read blocks in memory and performing
delayed writes.
config DM_DEBUG_BLOCK_MANAGER_LOCKING
bool "Block manager locking"
depends on DM_BUFIO
- ---help---
+ help
Block manager locking can catch various metadata corruption issues.
If unsure, say N.
bool "Keep stack trace of persistent data block lock holders"
depends on STACKTRACE_SUPPORT && DM_DEBUG_BLOCK_MANAGER_LOCKING
select STACKTRACE
- ---help---
+ help
Enable this for messages that may help debug problems with the
block manager locking used by thin provisioning and caching.
config DM_BIO_PRISON
tristate
depends on BLK_DEV_DM
- ---help---
+ help
Some bio locking schemes used by other device-mapper targets
including thin provisioning.
config DM_UNSTRIPED
tristate "Unstriped target"
depends on BLK_DEV_DM
- ---help---
+ help
Unstripes I/O so it is issued solely on a single drive in a HW
RAID0 or dm-striped target.
select CRYPTO
select CRYPTO_CBC
select CRYPTO_ESSIV
- ---help---
+ help
This device-mapper target allows you to create a device that
transparently encrypts the data on it. You'll need to activate
the ciphers you're going to use in the cryptoapi configuration.
tristate "Snapshot target"
depends on BLK_DEV_DM
select DM_BUFIO
- ---help---
+ help
Allow volume managers to take writable snapshots of a device.
config DM_THIN_PROVISIONING
depends on BLK_DEV_DM
select DM_PERSISTENT_DATA
select DM_BIO_PRISON
- ---help---
+ help
Provides thin provisioning and snapshots that share a data store.
config DM_CACHE
default n
select DM_PERSISTENT_DATA
select DM_BIO_PRISON
- ---help---
+ help
dm-cache attempts to improve performance of a block device by
moving frequently used data to a smaller, higher performance
device. Different 'policy' plugins can be used to change the
tristate "Stochastic MQ Cache Policy (EXPERIMENTAL)"
depends on DM_CACHE
default y
- ---help---
+ help
A cache policy that uses a multiqueue ordered by recent hits
to select which blocks should be promoted and demoted.
This is meant to be a general purpose policy. It prioritises
config DM_WRITECACHE
tristate "Writecache target"
depends on BLK_DEV_DM
- ---help---
+ help
The writecache target caches writes on persistent memory or SSD.
It is intended for databases or other programs that need extremely
low commit latency.
default n
select DM_PERSISTENT_DATA
select DM_BIO_PRISON
- ---help---
+ help
dm-era tracks which parts of a block device are written to
over time. Useful for maintaining cache coherency when using
vendor snapshots.
depends on BLK_DEV_DM
default n
select DM_PERSISTENT_DATA
- ---help---
+ help
dm-clone produces a one-to-one copy of an existing, read-only source
device into a writable destination device. The cloned device is
visible/mountable immediately and the copy of the source device to the
config DM_MIRROR
tristate "Mirror target"
depends on BLK_DEV_DM
- ---help---
+ help
Allow volume managers to mirror logical volumes, also
needed for live data migration tools such as 'pvmove'.
tristate "Mirror userspace logging"
depends on DM_MIRROR && NET
select CONNECTOR
- ---help---
+ 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.
select MD_RAID10
select MD_RAID456
select BLK_DEV_MD
- ---help---
+ help
A dm target that supports RAID1, RAID10, RAID4, RAID5 and RAID6 mappings
A RAID-5 set of N drives with a capacity of C MB per drive provides
config DM_ZERO
tristate "Zero target"
depends on BLK_DEV_DM
- ---help---
+ help
A target that discards writes, and returns all zeroes for
reads. Useful in some recovery situations.
# 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
- ---help---
+ help
Allow volume managers to support multipath hardware.
config DM_MULTIPATH_QL
tristate "I/O Path Selector based on the number of in-flight I/Os"
depends on DM_MULTIPATH
- ---help---
+ help
This path selector is a dynamic load balancer which selects
the path with the least number of in-flight I/Os.
config DM_MULTIPATH_ST
tristate "I/O Path Selector based on the service time"
depends on DM_MULTIPATH
- ---help---
+ help
This path selector is a dynamic load balancer which selects
the path expected to complete the incoming I/O in the shortest
time.
config DM_DELAY
tristate "I/O delaying target"
depends on BLK_DEV_DM
- ---help---
+ help
A target that delays reads and/or writes and can send
them to different devices. Useful for testing.
config DM_DUST
tristate "Bad sector simulation target"
depends on BLK_DEV_DM
- ---help---
+ help
A target that simulates bad sector behavior.
Useful for testing.
config DM_INIT
bool "DM \"dm-mod.create=\" parameter support"
depends on BLK_DEV_DM=y
- ---help---
+ help
Enable "dm-mod.create=" parameter to create mapped devices at init time.
This option is useful to allow mounting rootfs without requiring an
initramfs.
config DM_UEVENT
bool "DM uevents"
depends on BLK_DEV_DM
- ---help---
+ help
Generate udev events for DM events.
config DM_FLAKEY
tristate "Flakey target"
depends on BLK_DEV_DM
- ---help---
+ help
A target that intermittently fails I/O for debugging purposes.
config DM_VERITY
select CRYPTO
select CRYPTO_HASH
select DM_BUFIO
- ---help---
+ help
This device-mapper target creates a read-only device that
transparently validates the data on one underlying device against
a pre-generated tree of cryptographic checksums stored on a second
depends on DM_VERITY
select REED_SOLOMON
select REED_SOLOMON_DEC8
- ---help---
+ help
Add forward error correction support to dm-verity. This option
makes it possible to use pre-generated error correction data to
recover from corrupted blocks.
config DM_SWITCH
tristate "Switch target support (EXPERIMENTAL)"
depends on BLK_DEV_DM
- ---help---
+ help
This device-mapper target creates a device that supports an arbitrary
mapping of fixed-size regions of I/O across a fixed set of paths.
The path used for any specific region can be switched dynamically
config DM_LOG_WRITES
tristate "Log writes target support"
depends on BLK_DEV_DM
- ---help---
+ help
This device-mapper target takes two devices, one device to use
normally, one to log all write operations done to the first device.
This is for use by file system developers wishing to verify that
select DM_BUFIO
select CRYPTO
select ASYNC_XOR
- ---help---
+ help
This device-mapper target emulates a block device that has
additional per-sector tags that can be used for storing
integrity information.
tristate "Drive-managed zoned block device target support"
depends on BLK_DEV_DM
depends on BLK_DEV_ZONED
- ---help---
+ help
This device-mapper target takes a host-managed or host-aware zoned
block device and exposes most of its capacity as a regular block
device (drive-managed zoned block device) without any write
projects / linux-2.6-microblaze.git / blobdiff