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1da177e4 LT |
1 | # |
2 | # Block device driver configuration | |
3 | # | |
4 | ||
afd44034 | 5 | menuconfig MD |
1da177e4 | 6 | bool "Multiple devices driver support (RAID and LVM)" |
afd44034 | 7 | depends on BLOCK |
1da177e4 LT |
8 | help |
9 | Support multiple physical spindles through a single logical device. | |
10 | Required for RAID and logical volume management. | |
11 | ||
afd44034 JE |
12 | if MD |
13 | ||
1da177e4 LT |
14 | config BLK_DEV_MD |
15 | tristate "RAID support" | |
1da177e4 LT |
16 | ---help--- |
17 | This driver lets you combine several hard disk partitions into one | |
18 | logical block device. This can be used to simply append one | |
19 | partition to another one or to combine several redundant hard disks | |
20 | into a RAID1/4/5 device so as to provide protection against hard | |
21 | disk failures. This is called "Software RAID" since the combining of | |
22 | the partitions is done by the kernel. "Hardware RAID" means that the | |
23 | combining is done by a dedicated controller; if you have such a | |
24 | controller, you do not need to say Y here. | |
25 | ||
26 | More information about Software RAID on Linux is contained in the | |
27 | Software RAID mini-HOWTO, available from | |
28 | <http://www.tldp.org/docs.html#howto>. There you will also learn | |
29 | where to get the supporting user space utilities raidtools. | |
30 | ||
31 | If unsure, say N. | |
32 | ||
a364092a AV |
33 | config MD_AUTODETECT |
34 | bool "Autodetect RAID arrays during kernel boot" | |
ce52aebd | 35 | depends on BLK_DEV_MD=y |
a364092a AV |
36 | default y |
37 | ---help--- | |
38 | If you say Y here, then the kernel will try to autodetect raid | |
39 | arrays as part of its boot process. | |
40 | ||
41 | If you don't use raid and say Y, this autodetection can cause | |
42 | a several-second delay in the boot time due to various | |
43 | synchronisation steps that are part of this step. | |
44 | ||
45 | If unsure, say Y. | |
46 | ||
1da177e4 LT |
47 | config MD_LINEAR |
48 | tristate "Linear (append) mode" | |
49 | depends on BLK_DEV_MD | |
50 | ---help--- | |
51 | If you say Y here, then your multiple devices driver will be able to | |
52 | use the so-called linear mode, i.e. it will combine the hard disk | |
53 | partitions by simply appending one to the other. | |
54 | ||
55 | To compile this as a module, choose M here: the module | |
56 | will be called linear. | |
57 | ||
58 | If unsure, say Y. | |
59 | ||
60 | config MD_RAID0 | |
61 | tristate "RAID-0 (striping) mode" | |
62 | depends on BLK_DEV_MD | |
63 | ---help--- | |
64 | If you say Y here, then your multiple devices driver will be able to | |
65 | use the so-called raid0 mode, i.e. it will combine the hard disk | |
66 | partitions into one logical device in such a fashion as to fill them | |
67 | up evenly, one chunk here and one chunk there. This will increase | |
68 | the throughput rate if the partitions reside on distinct disks. | |
69 | ||
70 | Information about Software RAID on Linux is contained in the | |
71 | Software-RAID mini-HOWTO, available from | |
72 | <http://www.tldp.org/docs.html#howto>. There you will also | |
73 | learn where to get the supporting user space utilities raidtools. | |
74 | ||
75 | To compile this as a module, choose M here: the module | |
76 | will be called raid0. | |
77 | ||
78 | If unsure, say Y. | |
79 | ||
80 | config MD_RAID1 | |
81 | tristate "RAID-1 (mirroring) mode" | |
82 | depends on BLK_DEV_MD | |
83 | ---help--- | |
84 | A RAID-1 set consists of several disk drives which are exact copies | |
85 | of each other. In the event of a mirror failure, the RAID driver | |
86 | will continue to use the operational mirrors in the set, providing | |
87 | an error free MD (multiple device) to the higher levels of the | |
88 | kernel. In a set with N drives, the available space is the capacity | |
89 | of a single drive, and the set protects against a failure of (N - 1) | |
90 | drives. | |
91 | ||
92 | Information about Software RAID on Linux is contained in the | |
93 | Software-RAID mini-HOWTO, available from | |
94 | <http://www.tldp.org/docs.html#howto>. There you will also | |
95 | learn where to get the supporting user space utilities raidtools. | |
96 | ||
97 | If you want to use such a RAID-1 set, say Y. To compile this code | |
98 | as a module, choose M here: the module will be called raid1. | |
99 | ||
100 | If unsure, say Y. | |
101 | ||
102 | config MD_RAID10 | |
08fb730c N |
103 | tristate "RAID-10 (mirrored striping) mode" |
104 | depends on BLK_DEV_MD | |
1da177e4 LT |
105 | ---help--- |
106 | RAID-10 provides a combination of striping (RAID-0) and | |
4d2554d0 | 107 | mirroring (RAID-1) with easier configuration and more flexible |
1da177e4 LT |
108 | layout. |
109 | Unlike RAID-0, but like RAID-1, RAID-10 requires all devices to | |
110 | be the same size (or at least, only as much as the smallest device | |
111 | will be used). | |
112 | RAID-10 provides a variety of layouts that provide different levels | |
113 | of redundancy and performance. | |
114 | ||
115 | RAID-10 requires mdadm-1.7.0 or later, available at: | |
116 | ||
117 | ftp://ftp.kernel.org/pub/linux/utils/raid/mdadm/ | |
118 | ||
119 | If unsure, say Y. | |
120 | ||
16a53ecc N |
121 | config MD_RAID456 |
122 | tristate "RAID-4/RAID-5/RAID-6 mode" | |
1da177e4 | 123 | depends on BLK_DEV_MD |
f5e70d0f | 124 | select RAID6_PQ |
9bc89cd8 DW |
125 | select ASYNC_MEMCPY |
126 | select ASYNC_XOR | |
ac6b53b6 DW |
127 | select ASYNC_PQ |
128 | select ASYNC_RAID6_RECOV | |
1da177e4 LT |
129 | ---help--- |
130 | A RAID-5 set of N drives with a capacity of C MB per drive provides | |
131 | the capacity of C * (N - 1) MB, and protects against a failure | |
132 | of a single drive. For a given sector (row) number, (N - 1) drives | |
133 | contain data sectors, and one drive contains the parity protection. | |
134 | For a RAID-4 set, the parity blocks are present on a single drive, | |
135 | while a RAID-5 set distributes the parity across the drives in one | |
136 | of the available parity distribution methods. | |
137 | ||
16a53ecc N |
138 | A RAID-6 set of N drives with a capacity of C MB per drive |
139 | provides the capacity of C * (N - 2) MB, and protects | |
140 | against a failure of any two drives. For a given sector | |
141 | (row) number, (N - 2) drives contain data sectors, and two | |
142 | drives contains two independent redundancy syndromes. Like | |
143 | RAID-5, RAID-6 distributes the syndromes across the drives | |
144 | in one of the available parity distribution methods. | |
145 | ||
1da177e4 LT |
146 | Information about Software RAID on Linux is contained in the |
147 | Software-RAID mini-HOWTO, available from | |
148 | <http://www.tldp.org/docs.html#howto>. There you will also | |
149 | learn where to get the supporting user space utilities raidtools. | |
150 | ||
16a53ecc | 151 | If you want to use such a RAID-4/RAID-5/RAID-6 set, say Y. To |
1da177e4 | 152 | compile this code as a module, choose M here: the module |
16a53ecc | 153 | will be called raid456. |
1da177e4 LT |
154 | |
155 | If unsure, say Y. | |
156 | ||
07a3b417 DW |
157 | config MULTICORE_RAID456 |
158 | bool "RAID-4/RAID-5/RAID-6 Multicore processing (EXPERIMENTAL)" | |
159 | depends on MD_RAID456 | |
160 | depends on SMP | |
161 | depends on EXPERIMENTAL | |
162 | ---help--- | |
163 | Enable the raid456 module to dispatch per-stripe raid operations to a | |
164 | thread pool. | |
165 | ||
166 | If unsure, say N. | |
cb3c8299 | 167 | |
1da177e4 LT |
168 | config MD_MULTIPATH |
169 | tristate "Multipath I/O support" | |
170 | depends on BLK_DEV_MD | |
171 | help | |
93bd89a6 N |
172 | MD_MULTIPATH provides a simple multi-path personality for use |
173 | the MD framework. It is not under active development. New | |
174 | projects should consider using DM_MULTIPATH which has more | |
175 | features and more testing. | |
1da177e4 LT |
176 | |
177 | If unsure, say N. | |
178 | ||
179 | config MD_FAULTY | |
180 | tristate "Faulty test module for MD" | |
181 | depends on BLK_DEV_MD | |
182 | help | |
183 | The "faulty" module allows for a block device that occasionally returns | |
184 | read or write errors. It is useful for testing. | |
185 | ||
186 | In unsure, say N. | |
187 | ||
188 | config BLK_DEV_DM | |
189 | tristate "Device mapper support" | |
1da177e4 LT |
190 | ---help--- |
191 | Device-mapper is a low level volume manager. It works by allowing | |
192 | people to specify mappings for ranges of logical sectors. Various | |
193 | mapping types are available, in addition people may write their own | |
194 | modules containing custom mappings if they wish. | |
195 | ||
196 | Higher level volume managers such as LVM2 use this driver. | |
197 | ||
198 | To compile this as a module, choose M here: the module will be | |
199 | called dm-mod. | |
200 | ||
201 | If unsure, say N. | |
202 | ||
cc109201 BR |
203 | config DM_DEBUG |
204 | boolean "Device mapper debugging support" | |
0149e57f | 205 | depends on BLK_DEV_DM |
cc109201 BR |
206 | ---help--- |
207 | Enable this for messages that may help debug device-mapper problems. | |
208 | ||
209 | If unsure, say N. | |
210 | ||
95d402f0 MP |
211 | config DM_BUFIO |
212 | tristate | |
d57916a0 | 213 | depends on BLK_DEV_DM |
95d402f0 MP |
214 | ---help--- |
215 | This interface allows you to do buffered I/O on a device and acts | |
216 | as a cache, holding recently-read blocks in memory and performing | |
217 | delayed writes. | |
218 | ||
4f81a417 MS |
219 | config DM_BIO_PRISON |
220 | tristate | |
d57916a0 | 221 | depends on BLK_DEV_DM |
4f81a417 MS |
222 | ---help--- |
223 | Some bio locking schemes used by other device-mapper targets | |
224 | including thin provisioning. | |
225 | ||
991d9fa0 JT |
226 | source "drivers/md/persistent-data/Kconfig" |
227 | ||
1da177e4 LT |
228 | config DM_CRYPT |
229 | tristate "Crypt target support" | |
0149e57f | 230 | depends on BLK_DEV_DM |
1da177e4 | 231 | select CRYPTO |
3263263f | 232 | select CRYPTO_CBC |
1da177e4 LT |
233 | ---help--- |
234 | This device-mapper target allows you to create a device that | |
235 | transparently encrypts the data on it. You'll need to activate | |
236 | the ciphers you're going to use in the cryptoapi configuration. | |
237 | ||
238 | Information on how to use dm-crypt can be found on | |
239 | ||
240 | <http://www.saout.de/misc/dm-crypt/> | |
241 | ||
242 | To compile this code as a module, choose M here: the module will | |
243 | be called dm-crypt. | |
244 | ||
245 | If unsure, say N. | |
246 | ||
247 | config DM_SNAPSHOT | |
0149e57f AK |
248 | tristate "Snapshot target" |
249 | depends on BLK_DEV_DM | |
1da177e4 | 250 | ---help--- |
4d2554d0 | 251 | Allow volume managers to take writable snapshots of a device. |
1da177e4 | 252 | |
991d9fa0 | 253 | config DM_THIN_PROVISIONING |
d57916a0 AK |
254 | tristate "Thin provisioning target" |
255 | depends on BLK_DEV_DM | |
991d9fa0 | 256 | select DM_PERSISTENT_DATA |
4f81a417 | 257 | select DM_BIO_PRISON |
991d9fa0 JT |
258 | ---help--- |
259 | Provides thin provisioning and snapshots that share a data store. | |
260 | ||
261 | config DM_DEBUG_BLOCK_STACK_TRACING | |
262 | boolean "Keep stack trace of thin provisioning block lock holders" | |
263 | depends on STACKTRACE_SUPPORT && DM_THIN_PROVISIONING | |
264 | select STACKTRACE | |
265 | ---help--- | |
266 | Enable this for messages that may help debug problems with the | |
267 | block manager locking used by thin provisioning. | |
268 | ||
269 | If unsure, say N. | |
270 | ||
c6b4fcba JT |
271 | config DM_CACHE |
272 | tristate "Cache target (EXPERIMENTAL)" | |
273 | depends on BLK_DEV_DM | |
274 | default n | |
275 | select DM_PERSISTENT_DATA | |
276 | select DM_BIO_PRISON | |
277 | ---help--- | |
278 | dm-cache attempts to improve performance of a block device by | |
279 | moving frequently used data to a smaller, higher performance | |
280 | device. Different 'policy' plugins can be used to change the | |
281 | algorithms used to select which blocks are promoted, demoted, | |
282 | cleaned etc. It supports writeback and writethrough modes. | |
283 | ||
f2836352 JT |
284 | config DM_CACHE_MQ |
285 | tristate "MQ Cache Policy (EXPERIMENTAL)" | |
286 | depends on DM_CACHE | |
287 | default y | |
288 | ---help--- | |
289 | A cache policy that uses a multiqueue ordered by recent hit | |
290 | count to select which blocks should be promoted and demoted. | |
291 | This is meant to be a general purpose policy. It prioritises | |
292 | reads over writes. | |
293 | ||
8735a813 HM |
294 | config DM_CACHE_CLEANER |
295 | tristate "Cleaner Cache Policy (EXPERIMENTAL)" | |
296 | depends on DM_CACHE | |
297 | default y | |
298 | ---help--- | |
299 | A simple cache policy that writes back all data to the | |
300 | origin. Used when decommissioning a dm-cache. | |
301 | ||
1da177e4 | 302 | config DM_MIRROR |
0149e57f AK |
303 | tristate "Mirror target" |
304 | depends on BLK_DEV_DM | |
1da177e4 LT |
305 | ---help--- |
306 | Allow volume managers to mirror logical volumes, also | |
307 | needed for live data migration tools such as 'pvmove'. | |
308 | ||
9d09e663 | 309 | config DM_RAID |
d9f691c3 | 310 | tristate "RAID 1/4/5/6/10 target" |
035220b3 | 311 | depends on BLK_DEV_DM |
b12d437b | 312 | select MD_RAID1 |
d9f691c3 | 313 | select MD_RAID10 |
9d09e663 N |
314 | select MD_RAID456 |
315 | select BLK_DEV_MD | |
316 | ---help--- | |
d9f691c3 | 317 | A dm target that supports RAID1, RAID10, RAID4, RAID5 and RAID6 mappings |
9d09e663 N |
318 | |
319 | A RAID-5 set of N drives with a capacity of C MB per drive provides | |
320 | the capacity of C * (N - 1) MB, and protects against a failure | |
321 | of a single drive. For a given sector (row) number, (N - 1) drives | |
322 | contain data sectors, and one drive contains the parity protection. | |
323 | For a RAID-4 set, the parity blocks are present on a single drive, | |
324 | while a RAID-5 set distributes the parity across the drives in one | |
325 | of the available parity distribution methods. | |
326 | ||
327 | A RAID-6 set of N drives with a capacity of C MB per drive | |
328 | provides the capacity of C * (N - 2) MB, and protects | |
329 | against a failure of any two drives. For a given sector | |
330 | (row) number, (N - 2) drives contain data sectors, and two | |
331 | drives contains two independent redundancy syndromes. Like | |
332 | RAID-5, RAID-6 distributes the syndromes across the drives | |
333 | in one of the available parity distribution methods. | |
334 | ||
f5db4af4 | 335 | config DM_LOG_USERSPACE |
d57916a0 AK |
336 | tristate "Mirror userspace logging" |
337 | depends on DM_MIRROR && NET | |
f5db4af4 JB |
338 | select CONNECTOR |
339 | ---help--- | |
340 | The userspace logging module provides a mechanism for | |
341 | relaying the dm-dirty-log API to userspace. Log designs | |
342 | which are more suited to userspace implementation (e.g. | |
343 | shared storage logs) or experimental logs can be implemented | |
344 | by leveraging this framework. | |
345 | ||
1da177e4 | 346 | config DM_ZERO |
0149e57f AK |
347 | tristate "Zero target" |
348 | depends on BLK_DEV_DM | |
1da177e4 LT |
349 | ---help--- |
350 | A target that discards writes, and returns all zeroes for | |
351 | reads. Useful in some recovery situations. | |
352 | ||
353 | config DM_MULTIPATH | |
0149e57f AK |
354 | tristate "Multipath target" |
355 | depends on BLK_DEV_DM | |
fe9233fb CS |
356 | # nasty syntax but means make DM_MULTIPATH independent |
357 | # of SCSI_DH if the latter isn't defined but if | |
358 | # it is, DM_MULTIPATH must depend on it. We get a build | |
359 | # error if SCSI_DH=m and DM_MULTIPATH=y | |
360 | depends on SCSI_DH || !SCSI_DH | |
1da177e4 LT |
361 | ---help--- |
362 | Allow volume managers to support multipath hardware. | |
363 | ||
fd5e0339 KU |
364 | config DM_MULTIPATH_QL |
365 | tristate "I/O Path Selector based on the number of in-flight I/Os" | |
366 | depends on DM_MULTIPATH | |
367 | ---help--- | |
368 | This path selector is a dynamic load balancer which selects | |
369 | the path with the least number of in-flight I/Os. | |
370 | ||
371 | If unsure, say N. | |
372 | ||
f392ba88 KU |
373 | config DM_MULTIPATH_ST |
374 | tristate "I/O Path Selector based on the service time" | |
375 | depends on DM_MULTIPATH | |
376 | ---help--- | |
377 | This path selector is a dynamic load balancer which selects | |
378 | the path expected to complete the incoming I/O in the shortest | |
379 | time. | |
380 | ||
381 | If unsure, say N. | |
382 | ||
26b9f228 | 383 | config DM_DELAY |
d57916a0 AK |
384 | tristate "I/O delaying target" |
385 | depends on BLK_DEV_DM | |
26b9f228 HM |
386 | ---help--- |
387 | A target that delays reads and/or writes and can send | |
388 | them to different devices. Useful for testing. | |
389 | ||
390 | If unsure, say N. | |
391 | ||
51e5b2bd | 392 | config DM_UEVENT |
e0b215da AK |
393 | bool "DM uevents" |
394 | depends on BLK_DEV_DM | |
51e5b2bd MA |
395 | ---help--- |
396 | Generate udev events for DM events. | |
397 | ||
3407ef52 | 398 | config DM_FLAKEY |
d57916a0 AK |
399 | tristate "Flakey target" |
400 | depends on BLK_DEV_DM | |
3407ef52 JB |
401 | ---help--- |
402 | A target that intermittently fails I/O for debugging purposes. | |
403 | ||
a4ffc152 | 404 | config DM_VERITY |
d57916a0 AK |
405 | tristate "Verity target support" |
406 | depends on BLK_DEV_DM | |
a4ffc152 MP |
407 | select CRYPTO |
408 | select CRYPTO_HASH | |
409 | select DM_BUFIO | |
410 | ---help--- | |
411 | This device-mapper target creates a read-only device that | |
412 | transparently validates the data on one underlying device against | |
413 | a pre-generated tree of cryptographic checksums stored on a second | |
414 | device. | |
415 | ||
416 | You'll need to activate the digests you're going to use in the | |
417 | cryptoapi configuration. | |
418 | ||
419 | To compile this code as a module, choose M here: the module will | |
420 | be called dm-verity. | |
421 | ||
422 | If unsure, say N. | |
423 | ||
afd44034 | 424 | endif # MD |