mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
685784aaf3
The async_tx api tries to use a dma engine for an operation, but will fall back to an optimized software routine otherwise. Xor support is implemented using the raid5 xor routines. For organizational purposes this routine is moved to a common area. The following fixes are also made: * rename xor_block => xor_blocks, suggested by Adrian Bunk * ensure that xor.o initializes before md.o in the built-in case * checkpatch.pl fixes * mark calibrate_xor_blocks __init, Adrian Bunk Cc: Adrian Bunk <bunk@stusta.de> Cc: NeilBrown <neilb@suse.de> Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
278 lines
9.3 KiB
Plaintext
278 lines
9.3 KiB
Plaintext
#
|
|
# Block device driver configuration
|
|
#
|
|
|
|
if BLOCK
|
|
|
|
menu "Multi-device support (RAID and LVM)"
|
|
|
|
config MD
|
|
bool "Multiple devices driver support (RAID and LVM)"
|
|
help
|
|
Support multiple physical spindles through a single logical device.
|
|
Required for RAID and logical volume management.
|
|
|
|
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
|
|
partition to another one or to combine several redundant hard disks
|
|
into a RAID1/4/5 device so as to provide protection against hard
|
|
disk failures. This is called "Software RAID" since the combining of
|
|
the partitions is done by the kernel. "Hardware RAID" means that the
|
|
combining is done by a dedicated controller; if you have such a
|
|
controller, you do not need to say Y here.
|
|
|
|
More 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 unsure, say N.
|
|
|
|
config MD_LINEAR
|
|
tristate "Linear (append) mode"
|
|
depends on BLK_DEV_MD
|
|
---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.
|
|
|
|
To compile this as a module, choose M here: the module
|
|
will be called linear.
|
|
|
|
If unsure, say Y.
|
|
|
|
config MD_RAID0
|
|
tristate "RAID-0 (striping) mode"
|
|
depends on BLK_DEV_MD
|
|
---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
|
|
up evenly, one chunk here and one chunk there. This will increase
|
|
the throughput rate if the partitions reside on distinct disks.
|
|
|
|
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.
|
|
|
|
To compile this as a module, choose M here: the module
|
|
will be called raid0.
|
|
|
|
If unsure, say Y.
|
|
|
|
config MD_RAID1
|
|
tristate "RAID-1 (mirroring) mode"
|
|
depends on BLK_DEV_MD
|
|
---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
|
|
an error free MD (multiple device) to the higher levels of the
|
|
kernel. In a set with N drives, the available space is the capacity
|
|
of a single drive, and the set protects against a failure of (N - 1)
|
|
drives.
|
|
|
|
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-1 set, say Y. To compile this code
|
|
as a module, choose M here: the module will be called raid1.
|
|
|
|
If unsure, say Y.
|
|
|
|
config MD_RAID10
|
|
tristate "RAID-10 (mirrored striping) mode (EXPERIMENTAL)"
|
|
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 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
|
|
will be used).
|
|
RAID-10 provides a variety of layouts that provide different levels
|
|
of redundancy and performance.
|
|
|
|
RAID-10 requires mdadm-1.7.0 or later, available at:
|
|
|
|
ftp://ftp.kernel.org/pub/linux/utils/raid/mdadm/
|
|
|
|
If unsure, say Y.
|
|
|
|
config MD_RAID456
|
|
tristate "RAID-4/RAID-5/RAID-6 mode"
|
|
depends on BLK_DEV_MD
|
|
select XOR_BLOCKS
|
|
---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
|
|
contain data sectors, and one drive contains the parity protection.
|
|
For a RAID-4 set, the parity blocks are present on a single drive,
|
|
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/RAID-6 set, say Y. To
|
|
compile this code as a module, choose M here: the module
|
|
will be called raid456.
|
|
|
|
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_MULTIPATH
|
|
tristate "Multipath I/O support"
|
|
depends on BLK_DEV_MD
|
|
help
|
|
Multipath-IO is the ability of certain devices to address the same
|
|
physical disk over multiple 'IO paths'. The code ensures that such
|
|
paths can be defined and handled at runtime, and ensures that a
|
|
transparent failover to the backup path(s) happens if a IO errors
|
|
arrives on the primary path.
|
|
|
|
If unsure, say N.
|
|
|
|
config MD_FAULTY
|
|
tristate "Faulty test module for MD"
|
|
depends on BLK_DEV_MD
|
|
help
|
|
The "faulty" module allows for a block device that occasionally returns
|
|
read or write errors. It is useful for testing.
|
|
|
|
In unsure, say N.
|
|
|
|
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
|
|
mapping types are available, in addition people may write their own
|
|
modules containing custom mappings if they wish.
|
|
|
|
Higher level volume managers such as LVM2 use this driver.
|
|
|
|
To compile this as a module, choose M here: the module will be
|
|
called dm-mod.
|
|
|
|
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
|
|
the ciphers you're going to use in the cryptoapi configuration.
|
|
|
|
Information on how to use dm-crypt can be found on
|
|
|
|
<http://www.saout.de/misc/dm-crypt/>
|
|
|
|
To compile this code as a module, choose M here: the module will
|
|
be called dm-crypt.
|
|
|
|
If unsure, say N.
|
|
|
|
config DM_SNAPSHOT
|
|
tristate "Snapshot target (EXPERIMENTAL)"
|
|
depends on BLK_DEV_DM && EXPERIMENTAL
|
|
---help---
|
|
Allow volume managers to take writable snapshots of a device.
|
|
|
|
config DM_MIRROR
|
|
tristate "Mirror target (EXPERIMENTAL)"
|
|
depends on BLK_DEV_DM && EXPERIMENTAL
|
|
---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
|
|
---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
|
|
---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
|
|
---help---
|
|
Multipath support for EMC CX/AX series hardware.
|
|
|
|
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.
|
|
|
|
endmenu
|
|
|
|
endif
|