]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2007 Neil Brown <neilb@suse.de> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@suse.de> | |
23 | */ | |
24 | ||
25 | #include "mdadm.h" | |
26 | ||
27 | char Version[] = Name " - v3.0-devel2 - 5th November 2008\n"; | |
28 | ||
29 | /* | |
30 | * File: ReadMe.c | |
31 | * | |
32 | * This file contains general comments about the implementation | |
33 | * and the various usage messages that can be displayed by mdadm | |
34 | * | |
35 | * mdadm is a single program that can be used to control Linux md devices. | |
36 | * It is intended to provide all the functionality of the mdtools and | |
37 | * raidtools but with a very different interface. | |
38 | * mdadm can perform all functions without a configuration file. | |
39 | * There is the option of using a configuration file, but not in the same | |
40 | * way that raidtools uses one | |
41 | * raidtools uses a configuration file to describe how to create a RAID | |
42 | * array, and also uses this file partially to start a previously | |
43 | * created RAID array. Further, raidtools requires the configuration | |
44 | * file for such things as stopping a raid array which needs to know | |
45 | * nothing about the array. | |
46 | * | |
47 | * The configuration file that can be used by mdadm lists two | |
48 | * different things: | |
49 | * 1/ a mapping from uuid to md device to identify which arrays are | |
50 | * expect and what names (numbers) they should be given | |
51 | * 2/ a list of devices that should be scanned for md sub-devices | |
52 | * | |
53 | * | |
54 | */ | |
55 | ||
56 | /* | |
57 | * mdadm has 7 major modes of operation: | |
58 | * 1/ Create | |
59 | * This mode is used to create a new array with a superblock | |
60 | * It can progress in several step create-add-add-run | |
61 | * or it can all happen with one command | |
62 | * 2/ Assemble | |
63 | * This mode is used to assemble the parts of a previously created | |
64 | * array into an active array. Components can be explicitly given | |
65 | * or can be searched for. mdadm (optionally) check that the components | |
66 | * do form a bona-fide array, and can, on request, fiddle superblock | |
67 | * version numbers so as to assemble a faulty array. | |
68 | * 3/ Build | |
69 | * This is for building legacy arrays without superblocks | |
70 | * 4/ Manage | |
71 | * This is for doing something to one or more devices | |
72 | * in an array, such as add,remove,fail. | |
73 | * run/stop/readonly/readwrite are also available | |
74 | * 5/ Misc | |
75 | * This is for doing things to individual devices. | |
76 | * They might be parts of an array so | |
77 | * zero-superblock, examine might be appropriate | |
78 | * They might be md arrays so | |
79 | * run,stop,rw,ro,detail might be appropriate | |
80 | * Also query will treat it as either | |
81 | * 6/ Monitor | |
82 | * This mode never exits but just monitors arrays and reports changes. | |
83 | * 7/ Grow | |
84 | * This mode allows for changing of key attributes of a raid array, such | |
85 | * as size, number of devices, and possibly even layout. | |
86 | * At the time if writing, there is only minimal support. | |
87 | */ | |
88 | ||
89 | char short_options[]="-ABCDEFGIQhVXWvqbc:i:l:p:m:n:x:u:c:d:z:U:sarfRSow1tye:"; | |
90 | char short_bitmap_options[]= | |
91 | "-ABCDEFGIQhVXWvqb:c:i:l:p:m:n:x:u:c:d:z:U:sarfRSow1tye:"; | |
92 | char short_bitmap_auto_options[]= | |
93 | "-ABCDEFGIQhVXWvqb:c:i:l:p:m:n:x:u:c:d:z:U:sa:rfRSow1tye:"; | |
94 | ||
95 | struct option long_options[] = { | |
96 | {"manage", 0, 0, '@'}, | |
97 | {"misc", 0, 0, '#'}, | |
98 | {"assemble", 0, 0, 'A'}, | |
99 | {"build", 0, 0, 'B'}, | |
100 | {"create", 0, 0, 'C'}, | |
101 | {"detail", 0, 0, 'D'}, | |
102 | {"examine", 0, 0, 'E'}, | |
103 | {"follow", 0, 0, 'F'}, | |
104 | {"grow", 0, 0, 'G'}, | |
105 | {"incremental",0,0, 'I'}, | |
106 | {"zero-superblock", 0, 0, 'K'}, /* deliberately no a short_option */ | |
107 | {"query", 0, 0, 'Q'}, | |
108 | {"examine-bitmap", 0, 0, 'X'}, | |
109 | {"auto-detect", 0, 0, AutoDetect}, | |
110 | {"detail-platform", 0, 0, DetailPlatform}, | |
111 | ||
112 | /* synonyms */ | |
113 | {"monitor", 0, 0, 'F'}, | |
114 | ||
115 | /* after those will normally come the name of the md device */ | |
116 | {"help", 0, 0, 'h'}, | |
117 | {"help-options",0,0,'h'}, | |
118 | {"version", 0, 0, 'V'}, | |
119 | {"verbose", 0, 0, 'v'}, | |
120 | {"quiet", 0, 0, 'q'}, | |
121 | ||
122 | /* For create or build: */ | |
123 | {"chunk", 1, 0, 'c'}, | |
124 | {"rounding", 1, 0, 'c'}, /* for linear, chunk is really a rounding number */ | |
125 | {"level", 1, 0, 'l'}, /* 0,1,4,5,6,linear */ | |
126 | {"parity", 1, 0, 'p'}, /* {left,right}-{a,}symmetric */ | |
127 | {"layout", 1, 0, 'p'}, | |
128 | {"raid-disks",1, 0, 'n'}, | |
129 | {"raid-devices",1, 0, 'n'}, | |
130 | {"spare-disks",1,0, 'x'}, | |
131 | {"spare-devices",1,0, 'x'}, | |
132 | {"size", 1, 0, 'z'}, | |
133 | {"auto", 1, 0, 'a'}, /* also for --assemble */ | |
134 | {"assume-clean",0,0, AssumeClean }, | |
135 | {"metadata", 1, 0, 'e'}, /* superblock format */ | |
136 | {"bitmap", 1, 0, 'b'}, | |
137 | {"bitmap-chunk", 1, 0, BitmapChunk}, | |
138 | {"write-behind", 2, 0, WriteBehind}, | |
139 | {"write-mostly",0, 0, 'W'}, | |
140 | {"re-add", 0, 0, ReAdd}, | |
141 | {"homehost", 1, 0, HomeHost}, | |
142 | {"auto-update-homehost", 0, 0, AutoHomeHost}, | |
143 | {"symlinks", 1, 0, Symlinks}, | |
144 | ||
145 | /* For assemble */ | |
146 | {"uuid", 1, 0, 'u'}, | |
147 | {"super-minor",1,0, 'm'}, | |
148 | {"name", 1, 0, 'N'}, | |
149 | {"config", 1, 0, 'c'}, | |
150 | {"scan", 0, 0, 's'}, | |
151 | {"force", 0, 0, 'f'}, | |
152 | {"update", 1, 0, 'U'}, | |
153 | ||
154 | /* Management */ | |
155 | {"add", 0, 0, 'a'}, | |
156 | {"remove", 0, 0, 'r'}, | |
157 | {"fail", 0, 0, 'f'}, | |
158 | {"set-faulty",0, 0, 'f'}, | |
159 | {"run", 0, 0, 'R'}, | |
160 | {"stop", 0, 0, 'S'}, | |
161 | {"readonly", 0, 0, 'o'}, | |
162 | {"readwrite", 0, 0, 'w'}, | |
163 | {"no-degraded",0,0, NoDegraded }, | |
164 | {"wait", 0, 0, 'W'}, | |
165 | {"wait-clean", 0, 0, Waitclean }, | |
166 | ||
167 | /* For Detail/Examine */ | |
168 | {"brief", 0, 0, 'b'}, | |
169 | {"export", 0, 0, 'Y'}, | |
170 | {"sparc2.2", 0, 0, Sparc22}, | |
171 | {"test", 0, 0, 't'}, | |
172 | ||
173 | /* For Follow/monitor */ | |
174 | {"mail", 1, 0, 'm'}, | |
175 | {"program", 1, 0, 'p'}, | |
176 | {"alert", 1, 0, 'p'}, | |
177 | {"delay", 1, 0, 'd'}, | |
178 | {"daemonise", 0, 0, 'f'}, | |
179 | {"daemonize", 0, 0, 'f'}, | |
180 | {"oneshot", 0, 0, '1'}, | |
181 | {"pid-file", 1, 0, 'i'}, | |
182 | {"syslog", 0, 0, 'y'}, | |
183 | /* For Grow */ | |
184 | {"backup-file", 1,0, BackupFile}, | |
185 | ||
186 | /* For Incremental */ | |
187 | {"rebuild-map", 0, 0, 'r'}, | |
188 | {0, 0, 0, 0} | |
189 | }; | |
190 | ||
191 | char Usage[] = | |
192 | "Usage: mdadm --help\n" | |
193 | " for help\n" | |
194 | ; | |
195 | ||
196 | char Help[] = | |
197 | "mdadm is used for building, managing, and monitoring\n" | |
198 | "Linux md devices (aka RAID arrays)\n" | |
199 | "Usage: mdadm --create device options...\n" | |
200 | " Create a new array from unused devices.\n" | |
201 | " mdadm --assemble device options...\n" | |
202 | " Assemble a previously created array.\n" | |
203 | " mdadm --build device options...\n" | |
204 | " Create or assemble an array without metadata.\n" | |
205 | " mdadm --manage device options...\n" | |
206 | " make changes to an existing array.\n" | |
207 | " mdadm --misc options... devices\n" | |
208 | " report on or modify various md related devices.\n" | |
209 | " mdadm --grow options device\n" | |
210 | " resize/reshape an active array\n" | |
211 | " mdadm --incremental device\n" | |
212 | " add a device to an array as appropriate\n" | |
213 | " mdadm --monitor options...\n" | |
214 | " Monitor one or more array for significant changes.\n" | |
215 | " mdadm device options...\n" | |
216 | " Shorthand for --manage.\n" | |
217 | "Any parameter that does not start with '-' is treated as a device name\n" | |
218 | "or, for --examine-bitmap, a file name.\n" | |
219 | "The first such name is often the name of an md device. Subsequent\n" | |
220 | "names are often names of component devices.\n" | |
221 | "\n" | |
222 | " For detailed help on the above major modes use --help after the mode\n" | |
223 | " e.g.\n" | |
224 | " mdadm --assemble --help\n" | |
225 | " For general help on options use\n" | |
226 | " mdadm --help-options\n" | |
227 | ; | |
228 | ||
229 | char OptionHelp[] = | |
230 | "Any parameter that does not start with '-' is treated as a device name\n" | |
231 | "or, for --examine-bitmap, a file name.\n" | |
232 | "The first such name is often the name of an md device. Subsequent\n" | |
233 | "names are often names of component devices.\n" | |
234 | "\n" | |
235 | "Some common options are:\n" | |
236 | " --help -h : General help message or, after above option,\n" | |
237 | " mode specific help message\n" | |
238 | " --help-options : This help message\n" | |
239 | " --version -V : Print version information for mdadm\n" | |
240 | " --verbose -v : Be more verbose about what is happening\n" | |
241 | " --quiet -q : Don't print un-necessary messages\n" | |
242 | " --brief -b : Be less verbose, more brief\n" | |
243 | " --export -Y : With --detail, use key=value format for easy\n" | |
244 | " import into environment\n" | |
245 | " --force -f : Override normal checks and be more forceful\n" | |
246 | "\n" | |
247 | " --assemble -A : Assemble an array\n" | |
248 | " --build -B : Build an array without metadata\n" | |
249 | " --create -C : Create a new array\n" | |
250 | " --detail -D : Display details of an array\n" | |
251 | " --examine -E : Examine superblock on an array component\n" | |
252 | " --examine-bitmap -X: Display the detail of a bitmap file\n" | |
253 | " --monitor -F : monitor (follow) some arrays\n" | |
254 | " --grow -G : resize/ reshape and array\n" | |
255 | " --incremental -I : add a single device to an array as appropriate\n" | |
256 | " --query -Q : Display general information about how a\n" | |
257 | " device relates to the md driver\n" | |
258 | " --auto-detect : Start arrays auto-detected by the kernel\n" | |
259 | ; | |
260 | /* | |
261 | "\n" | |
262 | " For create or build:\n" | |
263 | " --bitmap= -b : File to store bitmap in - may pre-exist for --build\n" | |
264 | " --chunk= -c : chunk size of kibibytes\n" | |
265 | " --rounding= : rounding factor for linear array (==chunk size)\n" | |
266 | " --level= -l : raid level: 0,1,4,5,6,linear,mp. 0 or linear for build\n" | |
267 | " --parity= -p : raid5/6 parity algorithm: {left,right}-{,a}symmetric\n" | |
268 | " --layout= : same as --parity\n" | |
269 | " --raid-devices= -n : number of active devices in array\n" | |
270 | " --spare-devices= -x: number of spares (eXtras) devices in initial array\n" | |
271 | " --size= -z : Size (in K) of each drive in RAID1/4/5/6/10 - optional\n" | |
272 | " --force -f : Honour devices as listed on command line. Don't\n" | |
273 | " : insert a missing drive for RAID5.\n" | |
274 | " --auto(=p) -a : Automatically allocate new (partitioned) md array if needed.\n" | |
275 | " --assume-clean : Assume the array is already in-sync. This is dangerous.\n" | |
276 | " --bitmap-chunk= : chunksize of bitmap in bitmap file (Kilobytes)\n" | |
277 | " --delay= -d : seconds between bitmap updates\n" | |
278 | " --write-behind= : number of simultaneous write-behind requests to allow (requires bitmap)\n" | |
279 | " --name= -N : Textual name for array - max 32 characters\n" | |
280 | "\n" | |
281 | " For assemble:\n" | |
282 | " --bitmap= -b : File to find bitmap information in\n" | |
283 | " --uuid= -u : uuid of array to assemble. Devices which don't\n" | |
284 | " have this uuid are excluded\n" | |
285 | " --super-minor= -m : minor number to look for in super-block when\n" | |
286 | " choosing devices to use.\n" | |
287 | " --name= -N : Array name to look for in super-block.\n" | |
288 | " --config= -c : config file\n" | |
289 | " --scan -s : scan config file for missing information\n" | |
290 | " --force -f : Assemble the array even if some superblocks appear out-of-date\n" | |
291 | " --update= -U : Update superblock: try '-A --update=?' for list of options.\n" | |
292 | " --auto(=p) -a : Automatically allocate new (partitioned) md array if needed.\n" | |
293 | " --no-degraded : Do not start any degraded arrays - default unless --scan.\n" | |
294 | "\n" | |
295 | " For detail or examine:\n" | |
296 | " --brief -b : Just print device name and UUID\n" | |
297 | "\n" | |
298 | " For follow/monitor:\n" | |
299 | " --mail= -m : Address to mail alerts of failure to\n" | |
300 | " --program= -p : Program to run when an event is detected\n" | |
301 | " --alert= : same as --program\n" | |
302 | " --delay= -d : seconds of delay between polling state. default=60\n" | |
303 | "\n" | |
304 | " General management:\n" | |
305 | " --add -a : add, or hotadd subsequent devices\n" | |
306 | " --remove -r : remove subsequent devices\n" | |
307 | " --fail -f : mark subsequent devices a faulty\n" | |
308 | " --set-faulty : same as --fail\n" | |
309 | " --run -R : start a partially built array\n" | |
310 | " --stop -S : deactivate array, releasing all resources\n" | |
311 | " --readonly -o : mark array as readonly\n" | |
312 | " --readwrite -w : mark array as readwrite\n" | |
313 | " --zero-superblock : erase the MD superblock from a device.\n" | |
314 | " --wait -W : wait for recovery/resync/reshape to finish.\n" | |
315 | ; | |
316 | */ | |
317 | ||
318 | char Help_create[] = | |
319 | "Usage: mdadm --create device -chunk=X --level=Y --raid-devices=Z devices\n" | |
320 | "\n" | |
321 | " This usage will initialise a new md array, associate some\n" | |
322 | " devices with it, and activate the array. In order to create an\n" | |
323 | " array with some devices missing, use the special word 'missing' in\n" | |
324 | " place of the relevant device name.\n" | |
325 | "\n" | |
326 | " Before devices are added, they are checked to see if they already contain\n" | |
327 | " raid superblocks or filesystems. They are also checked to see if\n" | |
328 | " the variance in device size exceeds 1%.\n" | |
329 | " If any discrepancy is found, the user will be prompted for confirmation\n" | |
330 | " before the array is created. The presence of a '--run' can override this\n" | |
331 | " caution.\n" | |
332 | "\n" | |
333 | " If the --size option is given then only that many kilobytes of each\n" | |
334 | " device is used, no matter how big each device is.\n" | |
335 | " If no --size is given, the apparent size of the smallest drive given\n" | |
336 | " is used for raid level 1 and greater, and the full device is used for\n" | |
337 | " other levels.\n" | |
338 | "\n" | |
339 | " Options that are valid with --create (-C) are:\n" | |
340 | " --bitmap= : Create a bitmap for the array with the given filename\n" | |
341 | " --chunk= -c : chunk size of kibibytes\n" | |
342 | " --rounding= : rounding factor for linear array (==chunk size)\n" | |
343 | " --level= -l : raid level: 0,1,4,5,6,linear,multipath and synonyms\n" | |
344 | " --parity= -p : raid5/6 parity algorithm: {left,right}-{,a}symmetric\n" | |
345 | " --layout= : same as --parity\n" | |
346 | " --raid-devices= -n : number of active devices in array\n" | |
347 | " --spare-devices= -x: number of spares (eXtras) devices in initial array\n" | |
348 | " --size= -z : Size (in K) of each drive in RAID1/4/5/6/10 - optional\n" | |
349 | " --force -f : Honour devices as listed on command line. Don't\n" | |
350 | " : insert a missing drive for RAID5.\n" | |
351 | " --run -R : insist of running the array even if not all\n" | |
352 | " : devices are present or some look odd.\n" | |
353 | " --readonly -o : start the array readonly - not supported yet.\n" | |
354 | " --name= -N : Textual name for array - max 32 characters\n" | |
355 | " --bitmap-chunk= : bitmap chunksize in Kilobytes.\n" | |
356 | " --delay= -d : bitmap update delay in seconds.\n" | |
357 | "\n" | |
358 | ; | |
359 | ||
360 | char Help_build[] = | |
361 | "Usage: mdadm --build device -chunk=X --level=Y --raid-devices=Z devices\n" | |
362 | "\n" | |
363 | " This usage is similar to --create. The difference is that it creates\n" | |
364 | " a legacy array without a superblock. With these arrays there is no\n" | |
365 | " different between initially creating the array and subsequently\n" | |
366 | " assembling the array, except that hopefully there is useful data\n" | |
367 | " there in the second case.\n" | |
368 | "\n" | |
369 | " The level may only be 0, raid0, or linear.\n" | |
370 | " All devices must be listed and the array will be started once complete.\n" | |
371 | " Options that are valid with --build (-B) are:\n" | |
372 | " --bitmap= : file to store/find bitmap information in.\n" | |
373 | " --chunk= -c : chunk size of kibibytes\n" | |
374 | " --rounding= : rounding factor for linear array (==chunk size)\n" | |
375 | " --level= -l : 0, raid0, or linear\n" | |
376 | " --raid-devices= -n : number of active devices in array\n" | |
377 | " --bitmap-chunk= : bitmap chunksize in Kilobytes.\n" | |
378 | " --delay= -d : bitmap update delay in seconds.\n" | |
379 | ; | |
380 | ||
381 | char Help_assemble[] = | |
382 | "Usage: mdadm --assemble device options...\n" | |
383 | " mdadm --assemble --scan options...\n" | |
384 | "\n" | |
385 | "This usage assembles one or more raid arrays from pre-existing\n" | |
386 | "components.\n" | |
387 | "For each array, mdadm needs to know the md device, the identity of\n" | |
388 | "the array, and a number of sub devices. These can be found in a number\n" | |
389 | "of ways.\n" | |
390 | "\n" | |
391 | "The md device is either given on the command line or is found listed\n" | |
392 | "in the config file. The array identity is determined either from the\n" | |
393 | "--uuid or --super-minor commandline arguments, from the config file,\n" | |
394 | "or from the first component device on the command line.\n" | |
395 | "\n" | |
396 | "The different combinations of these are as follows:\n" | |
397 | " If the --scan option is not given, then only devices and identities\n" | |
398 | " listed on the command line are considered.\n" | |
399 | " The first device will be the array device, and the remainder will be\n" | |
400 | " examined when looking for components.\n" | |
401 | " If an explicit identity is given with --uuid or --super-minor, then\n" | |
402 | " only devices with a superblock which matches that identity is considered,\n" | |
403 | " otherwise every device listed is considered.\n" | |
404 | "\n" | |
405 | " If the --scan option is given, and no devices are listed, then\n" | |
406 | " every array listed in the config file is considered for assembly.\n" | |
407 | " The identity of candidate devices are determined from the config file.\n" | |
408 | "\n" | |
409 | " If the --scan option is given as well as one or more devices, then\n" | |
410 | " Those devices are md devices that are to be assembled. Their identity\n" | |
411 | " and components are determined from the config file.\n" | |
412 | "\n" | |
413 | " If mdadm can not find all of the components for an array, it will assemble\n" | |
414 | " it but not activate it unless --run or --scan is given. To preserve this\n" | |
415 | " behaviour even with --scan, add --no-degraded. Note that \"all of the\n" | |
416 | " components\" means as many as were present the last time the array was running\n" | |
417 | " as recorded in the superblock. If the array was already degraded, and\n" | |
418 | " the missing device is not a new problem, it will still be assembled. It\n" | |
419 | " is only newly missing devices that cause the array not to be started.\n" | |
420 | "\n" | |
421 | "Options that are valid with --assemble (-A) are:\n" | |
422 | " --bitmap= : bitmap file to use wit the array\n" | |
423 | " --uuid= -u : uuid of array to assemble. Devices which don't\n" | |
424 | " have this uuid are excluded\n" | |
425 | " --super-minor= -m : minor number to look for in super-block when\n" | |
426 | " choosing devices to use.\n" | |
427 | " --name= -N : Array name to look for in super-block.\n" | |
428 | " --config= -c : config file\n" | |
429 | " --scan -s : scan config file for missing information\n" | |
430 | " --run -R : Try to start the array even if not enough devices\n" | |
431 | " for a full array are present\n" | |
432 | " --force -f : Assemble the array even if some superblocks appear\n" | |
433 | " : out-of-date. This involves modifying the superblocks.\n" | |
434 | " --update= -U : Update superblock: try '-A --update=?' for option list.\n" | |
435 | " --no-degraded : Assemble but do not start degraded arrays.\n" | |
436 | ; | |
437 | ||
438 | char Help_manage[] = | |
439 | "Usage: mdadm arraydevice options component devices...\n" | |
440 | "\n" | |
441 | "This usage is for managing the component devices within an array.\n" | |
442 | "The --manage option is not needed and is assumed if the first argument\n" | |
443 | "is a device name or a management option.\n" | |
444 | "The first device listed will be taken to be an md array device, and\n" | |
445 | "subsequent devices are (potential) components of that array.\n" | |
446 | "\n" | |
447 | "Options that are valid with management mode are:\n" | |
448 | " --add -a : hotadd subsequent devices to the array\n" | |
449 | " --remove -r : remove subsequent devices, which must not be active\n" | |
450 | " --fail -f : mark subsequent devices a faulty\n" | |
451 | " --set-faulty : same as --fail\n" | |
452 | " --run -R : start a partially built array\n" | |
453 | " --stop -S : deactivate array, releasing all resources\n" | |
454 | " --readonly -o : mark array as readonly\n" | |
455 | " --readwrite -w : mark array as readwrite\n" | |
456 | ; | |
457 | ||
458 | char Help_misc[] = | |
459 | "Usage: mdadm misc_option devices...\n" | |
460 | "\n" | |
461 | "This usage is for performing some task on one or more devices, which\n" | |
462 | "may be arrays or components, depending on the task.\n" | |
463 | "The --misc option is not needed (though it is allowed) and is assumed\n" | |
464 | "if the first argument in a misc option.\n" | |
465 | "\n" | |
466 | "Options that are valid with the miscellaneous mode are:\n" | |
467 | " --query -Q : Display general information about how a\n" | |
468 | " device relates to the md driver\n" | |
469 | " --detail -D : Display details of an array\n" | |
470 | " --detail-platform : Display hardware/firmware details\n" | |
471 | " --examine -E : Examine superblock on an array component\n" | |
472 | " --examine-bitmap -X: Display contents of a bitmap file\n" | |
473 | " --zero-superblock : erase the MD superblock from a device.\n" | |
474 | " --run -R : start a partially built array\n" | |
475 | " --stop -S : deactivate array, releasing all resources\n" | |
476 | " --readonly -o : mark array as readonly\n" | |
477 | " --readwrite -w : mark array as readwrite\n" | |
478 | " --test -t : exit status 0 if ok, 1 if degrade, 2 if dead, 4 if missing\n" | |
479 | " --wait -W : wait for resync/rebuild/recovery to finish\n" | |
480 | ; | |
481 | ||
482 | char Help_monitor[] = | |
483 | "Usage: mdadm --monitor options devices\n" | |
484 | "\n" | |
485 | "This usage causes mdadm to monitor a number of md arrays by periodically\n" | |
486 | "polling their status and acting on any changes.\n" | |
487 | "If any devices are listed then those devices are monitored, otherwise\n" | |
488 | "all devices listed in the config file are monitored.\n" | |
489 | "The address for mailing advisories to, and the program to handle\n" | |
490 | "each change can be specified in the config file or on the command line.\n" | |
491 | "If no mail address or program are specified, then mdadm reports all\n" | |
492 | "state changes to stdout.\n" | |
493 | "\n" | |
494 | "Options that are valid with the monitor (-F --follow) mode are:\n" | |
495 | " --mail= -m : Address to mail alerts of failure to\n" | |
496 | " --program= -p : Program to run when an event is detected\n" | |
497 | " --alert= : same as --program\n" | |
498 | " --delay= -d : seconds of delay between polling state. default=60\n" | |
499 | " --config= -c : specify a different config file\n" | |
500 | " --scan -s : find mail-address/program in config file\n" | |
501 | " --daemonise -f : Fork and continue in child, parent exits\n" | |
502 | " --pid-file= -i : In daemon mode write pid to specified file instead of stdout\n" | |
503 | " --oneshot -1 : Check for degraded arrays, then exit\n" | |
504 | " --test -t : Generate a TestMessage event against each array at startup\n" | |
505 | ; | |
506 | ||
507 | char Help_grow[] = | |
508 | "Usage: mdadm --grow device options\n" | |
509 | "\n" | |
510 | "This usage causes mdadm to attempt to reconfigure a running array.\n" | |
511 | "This is only possibly if the kernel being used supports a particular\n" | |
512 | "reconfiguration. This version supports changing the number of\n" | |
513 | "devices in a RAID1/5/6, changing the active size of all devices in\n" | |
514 | "a RAID1/4/5/6, adding or removing a write-intent bitmap, and changing\n" | |
515 | "the error mode for a 'FAULTY' array.\n" | |
516 | "\n" | |
517 | "Options that are valid with the grow (-G --grow) mode are:\n" | |
518 | " --level= -l : Tell mdadm what level the array is so that it can\n" | |
519 | " : interpret '--layout' properly.\n" | |
520 | " --layout= -p : For a FAULTY array, set/change the error mode.\n" | |
521 | " --size= -z : Change the active size of devices in an array.\n" | |
522 | " : This is useful if all devices have been replaced\n" | |
523 | " : with larger devices. Value is in Kilobytes, or\n" | |
524 | " : the special word 'max' meaning 'as large as possible'.\n" | |
525 | " --raid-devices= -n : Change the number of active devices in an array.\n" | |
526 | " --bitmap= -b : Add or remove a write-intent bitmap.\n" | |
527 | " --backup-file= file : A file on a differt device to store data for a\n" | |
528 | " : short time while increasing raid-devices on a\n" | |
529 | " : RAID4/5/6 array. Not needed when a spare is present.\n" | |
530 | ; | |
531 | ||
532 | char Help_incr[] = | |
533 | "Usage: mdadm --incremental [-Rqrs] device\n" | |
534 | "\n" | |
535 | "This usage allows for incremental assembly of md arrays. Devices can be\n" | |
536 | "added one at a time as they are discovered. Once an array has all expected\n" | |
537 | "devices, it will be started.\n" | |
538 | "\n" | |
539 | "Options that are valid with incremental assembly (-I --incremental) more are:\n" | |
540 | " --run -R : run arrays as soon as a minimal number of devices are\n" | |
541 | " : present rather than waiting for all expected.\n" | |
542 | " --quiet -q : Don't print any information messages, just errors.\n" | |
543 | " --rebuild -r : Rebuild the 'map' file that mdadm uses for tracking\n" | |
544 | " : partial arrays.\n" | |
545 | " --scan -s : Use with -R to start any arrays that have the minimal\n" | |
546 | " : required number of devices, but are not yet started.\n" | |
547 | ; | |
548 | ||
549 | char Help_config[] = | |
550 | "The /etc/mdadm.conf config file:\n\n" | |
551 | " The config file contains, apart from blank lines and comment lines that\n" | |
552 | " start with a hash(#), four sorts of configuration lines: array lines, \n" | |
553 | " device lines, mailaddr lines and program lines.\n" | |
554 | " Each configuration line is constructed of a number of space separated\n" | |
555 | " words, and can be continued on subsequent physical lines by indenting\n" | |
556 | " those lines.\n" | |
557 | "\n" | |
558 | " A device line starts with the word 'device' and then has a number of words\n" | |
559 | " which identify devices. These words should be names of devices in the\n" | |
560 | " filesystem, and can contain wildcards. There can be multiple words or each\n" | |
561 | " device line, and multiple device lines. All devices so listed are checked\n" | |
562 | " for relevant super blocks when assembling arrays.\n" | |
563 | "\n" | |
564 | " An array line start with the word 'array'. This is followed by the name of\n" | |
565 | " the array device in the filesystem, e.g. '/dev/md2'. Subsequent words\n" | |
566 | " describe the identity of the array, used to recognise devices to include in the\n" | |
567 | " array. The identity can be given as a UUID with a word starting 'uuid=', or\n" | |
568 | " as a minor-number stored in the superblock using 'super-minor=', or as a list\n" | |
569 | " of devices. This is given as a comma separated list of names, possibly\n" | |
570 | " containing wildcards, preceded by 'devices='. If multiple critea are given,\n" | |
571 | " than a device must match all of them to be considered.\n" | |
572 | "\n" | |
573 | " A mailaddr line starts with the word 'mailaddr' and should contain exactly\n" | |
574 | " one Email address. 'mdadm --monitor --scan' will send alerts of failed drives\n" | |
575 | " to this Email address." | |
576 | "\n" | |
577 | " A program line starts with the word 'program' and should contain exactly\n" | |
578 | " one program name. 'mdadm --monitor --scan' will run this program when any\n" | |
579 | " event is detected.\n" | |
580 | "\n" | |
581 | ; | |
582 | ||
583 | ||
584 | /* name/number mappings */ | |
585 | ||
586 | mapping_t r5layout[] = { | |
587 | { "left-asymmetric", 0}, | |
588 | { "right-asymmetric", 1}, | |
589 | { "left-symmetric", 2}, | |
590 | { "right-symmetric", 3}, | |
591 | ||
592 | { "default", 2}, | |
593 | { "la", 0}, | |
594 | { "ra", 1}, | |
595 | { "ls", 2}, | |
596 | { "rs", 3}, | |
597 | { NULL, 0} | |
598 | }; | |
599 | ||
600 | mapping_t pers[] = { | |
601 | { "linear", LEVEL_LINEAR}, | |
602 | { "raid0", 0}, | |
603 | { "0", 0}, | |
604 | { "stripe", 0}, | |
605 | { "raid1", 1}, | |
606 | { "1", 1}, | |
607 | { "mirror", 1}, | |
608 | { "raid4", 4}, | |
609 | { "4", 4}, | |
610 | { "raid5", 5}, | |
611 | { "5", 5}, | |
612 | { "multipath", LEVEL_MULTIPATH}, | |
613 | { "mp", LEVEL_MULTIPATH}, | |
614 | { "raid6", 6}, | |
615 | { "6", 6}, | |
616 | { "raid10", 10}, | |
617 | { "10", 10}, | |
618 | { "faulty", LEVEL_FAULTY}, | |
619 | { "container", LEVEL_CONTAINER}, | |
620 | { NULL, 0} | |
621 | }; | |
622 | ||
623 | ||
624 | mapping_t modes[] = { | |
625 | { "assemble", ASSEMBLE}, | |
626 | { "build", BUILD}, | |
627 | { "create", CREATE}, | |
628 | { "manage", MANAGE}, | |
629 | { "misc", MISC}, | |
630 | { "monitor", MONITOR}, | |
631 | { "grow", GROW}, | |
632 | { "incremental", INCREMENTAL}, | |
633 | { "auto-detect", AUTODETECT}, | |
634 | }; | |
635 | ||
636 | mapping_t faultylayout[] = { | |
637 | { "write-transient", WriteTransient }, | |
638 | { "wt", WriteTransient }, | |
639 | { "read-transient", ReadTransient }, | |
640 | { "rt", ReadTransient }, | |
641 | { "write-persistent", WritePersistent }, | |
642 | { "wp", WritePersistent }, | |
643 | { "read-persistent", ReadPersistent }, | |
644 | { "rp", ReadPersistent }, | |
645 | { "write-all", WriteAll }, | |
646 | { "wa", WriteAll }, | |
647 | { "read-fixable", ReadFixable }, | |
648 | { "rf", ReadFixable }, | |
649 | ||
650 | { "clear", ClearErrors}, | |
651 | { "flush", ClearFaults}, | |
652 | { "none", ClearErrors}, | |
653 | { "default", ClearErrors}, | |
654 | { NULL, 0} | |
655 | }; |