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1 # SPDX-License-Identifier: GPL-2.0-only
20 # after relevant mdadm enhancements - to make "names=yes"
21 # the default - are widely available.
34 Software RAID mini-HOWTO, available from
35 <https://www.tldp.org/docs.html#howto>. There you will also learn
49 a several-second delay in the boot time due to various
69 use the so-called linear mode, i.e. it will combine the hard disk
78 tristate "RAID-0 (striping) mode"
82 use the so-called raid0 mode, i.e. it will combine the hard disk
88 Software-RAID mini-HOWTO, available from
89 <https://www.tldp.org/docs.html#howto>. There you will also
98 tristate "RAID-1 (mirroring) mode"
101 A RAID-1 set consists of several disk drives which are exact copies
106 of a single drive, and the set protects against a failure of (N - 1)
110 Software-RAID mini-HOWTO, available from
111 <https://www.tldp.org/docs.html#howto>. There you will also
114 If you want to use such a RAID-1 set, say Y. To compile this code
120 tristate "RAID-10 (mirrored striping) mode"
123 RAID-10 provides a combination of striping (RAID-0) and
124 mirroring (RAID-1) with easier configuration and more flexible
126 Unlike RAID-0, but like RAID-1, RAID-10 requires all devices to
129 RAID-10 provides a variety of layouts that provide different levels
132 RAID-10 requires mdadm-1.7.0 or later, available at:
139 tristate "RAID-4/RAID-5/RAID-6 mode"
148 A RAID-5 set of N drives with a capacity of C MB per drive provides
149 the capacity of C * (N - 1) MB, and protects against a failure
150 of a single drive. For a given sector (row) number, (N - 1) drives
152 For a RAID-4 set, the parity blocks are present on a single drive,
153 while a RAID-5 set distributes the parity across the drives in one
156 A RAID-6 set of N drives with a capacity of C MB per drive
157 provides the capacity of C * (N - 2) MB, and protects
159 (row) number, (N - 2) drives contain data sectors, and two
161 RAID-5, RAID-6 distributes the syndromes across the drives
165 Software-RAID mini-HOWTO, available from
166 <https://www.tldp.org/docs.html#howto>. There you will also
169 If you want to use such a RAID-4/RAID-5/RAID-6 set, say Y. To
203 Device-mapper is a low level volume manager. It works by allowing
211 called dm-mod.
219 Enable this for messages that may help debug device-mapper problems.
228 as a cache, holding recently-read blocks in memory and performing
244 Enable this for messages that may help debug problems with the
253 Some bio locking schemes used by other device-mapper targets
256 source "drivers/md/persistent-data/Kconfig"
263 RAID0 or dm-striped target.
275 This device-mapper target allows you to create a device that
279 For further information on dm-crypt and userspace tools see:
283 be called dm-crypt.
309 dm-cache attempts to improve performance of a block device by
343 dm-ebs emulates smaller logical block size on backing devices
353 dm-era tracks which parts of a block device are written to
363 dm-clone produces a one-to-one copy of an existing, read-only source
384 relaying the dm-dirty-log API to userspace. Log designs
400 A RAID-5 set of N drives with a capacity of C MB per drive provides
401 the capacity of C * (N - 1) MB, and protects against a failure
402 of a single drive. For a given sector (row) number, (N - 1) drives
404 For a RAID-4 set, the parity blocks are present on a single drive,
405 while a RAID-5 set distributes the parity across the drives in one
408 A RAID-6 set of N drives with a capacity of C MB per drive
409 provides the capacity of C * (N - 2) MB, and protects
411 (row) number, (N - 2) drives contain data sectors, and two
413 RAID-5, RAID-6 distributes the syndromes across the drives
435 tristate "I/O Path Selector based on the number of in-flight I/Os"
439 the path with the least number of in-flight I/Os.
492 bool "DM \"dm-mod.create=\" parameter support"
495 Enable "dm-mod.create=" parameter to create mapped devices at init time.
498 See Documentation/admin-guide/device-mapper/dm-init.rst for dm-mod.create="..."
522 This device-mapper target creates a read-only device that
524 a pre-generated tree of cryptographic checksums stored on a second
531 be called dm-verity.
540 Add ability for dm-verity device to be validated if the
541 pre-generated tree of cryptographic checksums passed has a pkcs#7
553 Rely on the secondary trusted keyring to verify dm-verity signatures.
563 Rely also on the platform keyring to verify dm-verity signatures.
573 Add forward error correction support to dm-verity. This option
574 makes it possible to use pre-generated error correction data to
583 This device-mapper target creates a device that supports an arbitrary
584 mapping of fixed-size regions of I/O across a fixed set of paths.
589 be called dm-switch.
597 This device-mapper target takes two devices, one device to use
605 be called dm-log-writes.
619 This device-mapper target emulates a block device that has
620 additional per-sector tags that can be used for storing
623 This integrity target is used with the dm-crypt target to
628 be called dm-integrity.
631 tristate "Drive-managed zoned block device target support"
636 This device-mapper target takes a host-managed or host-aware zoned
638 device (drive-managed zoned block device) without any write
646 be called dm-zoned.
655 Generate audit events for device-mapper.
658 particular device-mapper targets, especially the integrity target.
660 source "drivers/md/dm-vdo/Kconfig"