1LVCHANGE(8) System Manager's Manual LVCHANGE(8)
2
6 lvchange - Change the attributes of logical volume(s)
7
9 lvchange option_args position_args
10 [ option_args ]
11 -a|--activate y|n|ay
13 --activationmode partial|degraded|complete
14 --addtag Tag
15 --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
16 -A|--autobackup y|n
17 --cachemode writethrough|writeback|passthrough
18 --cachepolicy String
19 --cachesettings String
20 --commandprofile String
21 --compression y|n
22 --config String
23 -C|--contiguous y|n
24 -d|--debug
25 --deduplication y|n
26 --deltag Tag
27 --detachprofile
28 --discards passdown|nopassdown|ignore
29 --driverloaded y|n
30 --errorwhenfull y|n
31 -f|--force
32 -h|--help
33 -K|--ignoreactivationskip
34 --ignorelockingfailure
35 --ignoremonitoring
36 --lockopt String
37 --longhelp
38 -j|--major Number
39 --[raid]maxrecoveryrate Size[k|UNIT]
40 --metadataprofile String
41 --minor Number
42 --[raid]minrecoveryrate Size[k|UNIT]
43 --monitor y|n
44 --nolocking
45 --noudevsync
46 -P|--partial
47 -p|--permission rw|r
48 -M|--persistent y|n
49 --poll y|n
50 --profile String
51 -q|--quiet
52 -r|--readahead auto|none|Number
53 --readonly
54 --rebuild PV
55 --refresh
56 --reportformat basic|json
57 --resync
58 -S|--select String
59 -k|--setactivationskip y|n
60 --[raid]syncaction check|repair
61 --sysinit
62 -t|--test
63 -v|--verbose
64 --version
65 --[raid]writebehind Number
66 --[raid]writemostly PV[:t|n|y]
67 -y|--yes
68 -Z|--zero y|n
69
71 lvchange changes LV attributes in the VG, changes LV activation in the
72 kernel, and includes other utilities for LV maintenance.
73
75 Change a general LV attribute.
76 For options listed in parentheses, any one is
77 required, after which the others are optional.
78 lvchange
80 ( -C|--contiguous y|n,
81 -p|--permission rw|r,
82 -r|--readahead auto|none|Number,
83 -k|--setactivationskip y|n,
84 -Z|--zero y|n,
85 -M|--persistent n,
86 --addtag Tag,
87 --deltag Tag,
88 --alloc contiguous|cling|cling_by_tags|normal|any‐
89 where|inherit,
90 --compression y|n,
91 --deduplication y|n,
92 --detachprofile,
93 --metadataprofile String,
94 --profile String,
95 --errorwhenfull y|n,
96 --discards passdown|nopassdown|ignore,
97 --cachemode writethrough|writeback|passthrough,
98 --cachepolicy String,
99 --cachesettings String,
100 --[raid]minrecoveryrate Size[k|UNIT],
101 --[raid]maxrecoveryrate Size[k|UNIT],
102 --[raid]writebehind Number,
103 --[raid]writemostly PV[:t|n|y] )
104 VG|LV|Tag|Select ...
105 [ -a|--activate y|n|ay ]
106 [ --poll y|n ]
107 [ --monitor y|n ]
108 [ COMMON_OPTIONS ]
109 -
110 Resyncronize a mirror or raid LV.
112 Use to reset 'R' attribute on a not initially synchronized LV.
113 lvchange --resync VG|LV_mirror_raid|Tag|Select ...
115 [ -a|--activate y|n|ay ]
116 [ COMMON_OPTIONS ]
117 -
118 Resynchronize or check a raid LV.
120 lvchange --syncaction check|repair VG|LV_raid|Tag|Select ...
122 [ COMMON_OPTIONS ]
123 -
124 Reconstruct data on specific PVs of a raid LV.
126 lvchange --rebuild PV VG|LV_raid|Tag|Select ...
128 [ COMMON_OPTIONS ]
129 -
130 Activate or deactivate an LV.
132 lvchange -a|--activate y|n|ay VG|LV|Tag|Select ...
134 [ -P|--partial ]
135 [ -K|--ignoreactivationskip ]
136 [ --activationmode partial|degraded|complete ]
137 [ --poll y|n ]
138 [ --monitor y|n ]
139 [ --ignorelockingfailure ]
140 [ --sysinit ]
141 [ --readonly ]
142 [ COMMON_OPTIONS ]
143 -
144 Reactivate an LV using the latest metadata.
146 lvchange --refresh VG|LV|Tag|Select ...
148 [ -P|--partial ]
149 [ --activationmode partial|degraded|complete ]
150 [ --poll y|n ]
151 [ --monitor y|n ]
152 [ COMMON_OPTIONS ]
153 -
154 Start or stop monitoring an LV from dmeventd.
156 lvchange --monitor y|n VG|LV|Tag|Select ...
158 [ COMMON_OPTIONS ]
159 -
160 Start or stop processing an LV conversion.
162 lvchange --poll y|n VG|LV|Tag|Select ...
164 [ --monitor y|n ]
165 [ COMMON_OPTIONS ]
166 -
167 Make the minor device number persistent for an LV.
169 lvchange -M|--persistent y --minor Number LV
171 [ -j|--major Number ]
172 [ -a|--activate y|n|ay ]
173 [ --poll y|n ]
174 [ --monitor y|n ]
175 [ COMMON_OPTIONS ]
176 -
177 Common options for command:
179 [ -A|--autobackup y|n ]
180 [ -f|--force ]
181 [ -S|--select String ]
182 [ --ignoremonitoring ]
183 [ --noudevsync ]
184 [ --reportformat basic|json ]
185 Common options for lvm:
187 [ -d|--debug ]
188 [ -h|--help ]
189 [ -q|--quiet ]
190 [ -t|--test ]
191 [ -v|--verbose ]
192 [ -y|--yes ]
193 [ --commandprofile String ]
194 [ --config String ]
195 [ --driverloaded y|n ]
196 [ --lockopt String ]
197 [ --longhelp ]
198 [ --nolocking ]
199 [ --profile String ]
200 [ --version ]
201
203 -a|--activate y|n|ay
204 Change the active state of LVs. An active LV can be used
205 through a block device, allowing data on the LV to be accessed.
206 y makes LVs active, or available. n makes LVs inactive, or
207 unavailable. The block device for the LV is added or removed
208 from the system using device-mapper in the kernel. A symbolic
209 link /dev/VGName/LVName pointing to the device node is also
210 added/removed. All software and scripts should access the
211 device through the symbolic link and present this as the name of
212 the device. The location and name of the underlying device node
213 may depend on the distribution, configuration (e.g. udev), or
214 release version. ay specifies autoactivation, in which case an
215 LV is activated only if it matches an item in lvm.conf activa‐
216 tion/auto_activation_volume_list. If the list is not set, all
217 LVs are considered to match, and if if the list is set but
218 empty, no LVs match. Autoactivation should be used during sys‐
219 tem boot to make it possible to select which LVs should be auto‐
220 matically activated by the system. See lvmlockd(8) for more
221 information about activation options ey and sy for shared VGs.
222 --activationmode partial|degraded|complete
224 Determines if LV activation is allowed when PVs are missing,
225 e.g. because of a device failure. complete only allows LVs with
226 no missing PVs to be activated, and is the most restrictive
227 mode. degraded allows RAID LVs with missing PVs to be acti‐
228 vated. (This does not include the "mirror" type, see "raid1"
229 instead.) partial allows any LV with missing PVs to be acti‐
230 vated, and should only be used for recovery or repair. For
231 default, see lvm.conf/activation_mode. See lvmraid(7) for more
232 information.
233 --addtag Tag
235 Adds a tag to a PV, VG or LV. This option can be repeated to add
236 multiple tags at once. See lvm(8) for information about tags.
237 --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
239 Determines the allocation policy when a command needs to allo‐
240 cate Physical Extents (PEs) from the VG. Each VG and LV has an
241 allocation policy which can be changed with vgchange/lvchange,
242 or overriden on the command line. normal applies common sense
243 rules such as not placing parallel stripes on the same PV.
244 inherit applies the VG policy to an LV. contiguous requires new
245 PEs be placed adjacent to existing PEs. cling places new PEs on
246 the same PV as existing PEs in the same stripe of the LV. If
247 there are sufficient PEs for an allocation, but normal does not
248 use them, anywhere will use them even if it reduces performance,
249 e.g. by placing two stripes on the same PV. Optional positional
250 PV args on the command line can also be used to limit which PVs
251 the command will use for allocation. See lvm(8) for more infor‐
252 mation about allocation.
253 -A|--autobackup y|n
255 Specifies if metadata should be backed up automatically after a
256 change. Enabling this is strongly advised! See vgcfgbackup(8)
257 for more information.
258 --cachemode writethrough|writeback|passthrough
260 Specifies when writes to a cache LV should be considered com‐
261 plete. writeback considers a write complete as soon as it is
262 stored in the cache pool. writethough considers a write com‐
263 plete only when it has been stored in both the cache pool and on
264 the origin LV. While writethrough may be slower for writes, it
265 is more resilient if something should happen to a device associ‐
266 ated with the cache pool LV. With passthrough, all reads are
267 served from the origin LV (all reads miss the cache) and all
268 writes are forwarded to the origin LV; additionally, write hits
269 cause cache block invalidates. See lvmcache(7) for more informa‐
270 tion.
271 --cachepolicy String
273 Specifies the cache policy for a cache LV. See lvmcache(7) for
274 more information.
275 --cachesettings String
277 Specifies tunable values for a cache LV in "Key = Value" form.
278 Repeat this option to specify multiple values. (The default
279 values should usually be adequate.) The special string value
280 default switches settings back to their default kernel values
281 and removes them from the list of settings stored in LVM meta‐
282 data. See lvmcache(7) for more information.
283 --commandprofile String
285 The command profile to use for command configuration. See
286 lvm.conf(5) for more information about profiles.
287 --compression y|n
289 Controls whether compression is enabled or disable for VDO vol‐
290 ume. See lvmvdo(7) for more information about VDO usage.
291 --config String
293 Config settings for the command. These override lvm.conf set‐
294 tings. The String arg uses the same format as lvm.conf, or may
295 use section/field syntax. See lvm.conf(5) for more information
296 about config.
297 -C|--contiguous y|n
299 Sets or resets the contiguous allocation policy for LVs.
300 Default is no contiguous allocation based on a next free princi‐
301 ple. It is only possible to change a non-contiguous allocation
302 policy to contiguous if all of the allocated physical extents in
303 the LV are already contiguous.
304 -d|--debug ...
306 Set debug level. Repeat from 1 to 6 times to increase the detail
307 of messages sent to the log file and/or syslog (if configured).
308 --deduplication y|n
310 Controls whether deduplication is enabled or disable for VDO
311 volume. See lvmvdo(7) for more information about VDO usage.
312 --deltag Tag
314 Deletes a tag from a PV, VG or LV. This option can be repeated
315 to delete multiple tags at once. See lvm(8) for information
316 about tags.
317 --detachprofile
319 Detaches a metadata profile from a VG or LV. See lvm.conf(5)
320 for more information about profiles.
321 --discards passdown|nopassdown|ignore
323 Specifies how the device-mapper thin pool layer in the kernel
324 should handle discards. ignore causes the thin pool to ignore
325 discards. nopassdown causes the thin pool to process discards
326 itself to allow reuse of unneeded extents in the thin pool.
327 passdown causes the thin pool to process discards itself (like
328 nopassdown) and pass the discards to the underlying device. See
329 lvmthin(7) for more information.
330 --driverloaded y|n
332 If set to no, the command will not attempt to use device-mapper.
333 For testing and debugging.
334 --errorwhenfull y|n
336 Specifies thin pool behavior when data space is exhausted. When
337 yes, device-mapper will immediately return an error when a thin
338 pool is full and an I/O request requires space. When no,
339 device-mapper will queue these I/O requests for a period of time
340 to allow the thin pool to be extended. Errors are returned if
341 no space is available after the timeout. (Also see dm-thin-pool
342 kernel module option no_space_timeout.) See lvmthin(7) for more
343 information.
344 -f|--force ...
346 Override various checks, confirmations and protections. Use
347 with extreme caution.
348 -h|--help
350 Display help text.
351 -K|--ignoreactivationskip
353 Ignore the "activation skip" LV flag during activation to allow
354 LVs with the flag set to be activated.
355 --ignorelockingfailure
357 Allows a command to continue with read-only metadata operations
358 after locking failures.
359 --ignoremonitoring
361 Do not interact with dmeventd unless --monitor is specified. Do
362 not use this if dmeventd is already monitoring a device.
363 --lockopt String
365 Used to pass options for special cases to lvmlockd. See lvm‐
366 lockd(8) for more information.
367 --longhelp
369 Display long help text.
370 -j|--major Number
372 Sets the major number of an LV block device.
373 --[raid]maxrecoveryrate Size[k|UNIT]
375 Sets the maximum recovery rate for a RAID LV. The rate value is
376 an amount of data per second for each device in the array. Set‐
377 ting the rate to 0 means it will be unbounded. See lvmraid(7)
378 for more information.
379 --metadataprofile String
381 The metadata profile to use for command configuration. See
382 lvm.conf(5) for more information about profiles.
383 --minor Number
385 Sets the minor number of an LV block device.
386 --[raid]minrecoveryrate Size[k|UNIT]
388 Sets the minimum recovery rate for a RAID LV. The rate value is
389 an amount of data per second for each device in the array. Set‐
390 ting the rate to 0 means it will be unbounded. See lvmraid(7)
391 for more information.
392 --monitor y|n
394 Start (yes) or stop (no) monitoring an LV with dmeventd.
395 dmeventd monitors kernel events for an LV, and performs auto‐
396 mated maintenance for the LV in reponse to specific events. See
397 dmeventd(8) for more information.
398 --nolocking
400 Disable locking.
401 --noudevsync
403 Disables udev synchronisation. The process will not wait for
404 notification from udev. It will continue irrespective of any
405 possible udev processing in the background. Only use this if
406 udev is not running or has rules that ignore the devices LVM
407 creates.
408 -P|--partial
410 Commands will do their best to activate LVs with missing PV
411 extents. Missing extents may be replaced with error or zero
412 segments according to the lvm.conf missing_stripe_filler set‐
413 ting. Metadata may not be changed with this option.
414 -p|--permission rw|r
416 Set access permission to read only r or read and write rw.
417 -M|--persistent y|n
419 When yes, makes the specified minor number persistent.
420 --poll y|n
422 When yes, start the background transformation of an LV. An
423 incomplete transformation, e.g. pvmove or lvconvert interrupted
424 by reboot or crash, can be restarted from the last checkpoint
425 with --poll y. When no, background transformation of an LV will
426 not occur, and the transformation will not complete. It may not
427 be appropriate to immediately poll an LV after activation, in
428 which case --poll n can be used to defer polling until a later
429 --poll y command.
430 --profile String
432 An alias for --commandprofile or --metadataprofile, depending on
433 the command.
434 -q|--quiet ...
436 Suppress output and log messages. Overrides --debug and --ver‐
437 bose. Repeat once to also suppress any prompts with answer
438 'no'.
439 -r|--readahead auto|none|Number
441 Sets read ahead sector count of an LV. auto is the default
442 which allows the kernel to choose a suitable value automati‐
443 cally. none is equivalent to zero.
444 --readonly
446 Run the command in a special read-only mode which will read on-
447 disk metadata without needing to take any locks. This can be
448 used to peek inside metadata used by a virtual machine image
449 while the virtual machine is running. No attempt will be made to
450 communicate with the device-mapper kernel driver, so this option
451 is unable to report whether or not LVs are actually in use.
452 --rebuild PV
454 Selects a PV to rebuild in a raid LV. Multiple PVs can be
455 rebuilt by repeating this option. Use this option in place of
456 --resync or --syncaction repair when the PVs with corrupted data
457 are known, and their data should be reconstructed rather than
458 reconstructing default (rotating) data. See lvmraid(7) for more
459 information.
460 --refresh
462 If the LV is active, reload its metadata. This is not necessary
463 in normal operation, but may be useful if something has gone
464 wrong, or if some form of manual LV sharing is being used.
465 --reportformat basic|json
467 Overrides current output format for reports which is defined
468 globally by the report/output_format setting in lvm.conf. basic
469 is the original format with columns and rows. If there is more
470 than one report per command, each report is prefixed with the
471 report name for identification. json produces report output in
472 JSON format. See lvmreport(7) for more information.
473 --resync
475 Initiates mirror synchronization. Synchronization generally hap‐
476 pens automatically, but this option forces it to run. Also see
477 --rebuild to synchronize a specific PV. During synchronization,
478 data is read from the primary mirror device and copied to the
479 others. This can take considerable time, during which the LV is
480 without a complete redundant copy of the data. See lvmraid(7)
481 for more information.
482 -S|--select String
484 Select objects for processing and reporting based on specified
485 criteria. The criteria syntax is described by --select help and
486 lvmreport(7). For reporting commands, one row is displayed for
487 each object matching the criteria. See --options help for
488 selectable object fields. Rows can be displayed with an addi‐
489 tional "selected" field (-o selected) showing 1 if the row
490 matches the selection and 0 otherwise. For non-reporting com‐
491 mands which process LVM entities, the selection is used to
492 choose items to process.
493 -k|--setactivationskip y|n
495 Persistently sets (yes) or clears (no) the "activation skip"
496 flag on an LV. An LV with this flag set is not activated unless
497 the --ignoreactivationskip option is used by the activation com‐
498 mand. This flag is set by default on new thin snapshot LVs.
499 The flag is not applied to deactivation. The current value of
500 the flag is indicated in the lvs lv_attr bits.
501 --[raid]syncaction check|repair
503 Initiate different types of RAID synchronization. This causes
504 the RAID LV to read all data and parity blocks in the array and
505 check for discrepancies (mismatches between mirrors or incorrect
506 parity values). check will count but not correct discrepancies.
507 repair will correct discrepancies. See lvs for reporting dis‐
508 crepancies found or repaired.
509 --sysinit
511 Indicates that vgchange/lvchange is being invoked from early
512 system initialisation scripts (e.g. rc.sysinit or an initrd),
513 before writable filesystems are available. As such, some func‐
514 tionality needs to be disabled and this option acts as a short‐
515 cut which selects an appropriate set of options. Currently, this
516 is equivalent to using --ignorelockingfailure, --ignoremonitor‐
517 ing, --poll n, and setting env var LVM_SUPPRESS_LOCKING_FAIL‐
518 URE_MESSAGES. vgchange/lvchange skip autoactivation, and defer
519 to pvscan autoactivation.
520 -t|--test
522 Run in test mode. Commands will not update metadata. This is
523 implemented by disabling all metadata writing but nevertheless
524 returning success to the calling function. This may lead to
525 unusual error messages in multi-stage operations if a tool
526 relies on reading back metadata it believes has changed but
527 hasn't.
528 -v|--verbose ...
530 Set verbose level. Repeat from 1 to 4 times to increase the
531 detail of messages sent to stdout and stderr.
532 --version
534 Display version information.
535 --[raid]writebehind Number
537 The maximum number of outstanding writes that are allowed to
538 devices in a RAID1 LV that is marked write-mostly. Once this
539 value is exceeded, writes become synchronous (i.e. all writes to
540 the constituent devices must complete before the array signals
541 the write has completed). Setting the value to zero clears the
542 preference and allows the system to choose the value arbitrar‐
543 ily.
544 --[raid]writemostly PV[:t|n|y]
546 Mark a device in a RAID1 LV as write-mostly. All reads to these
547 drives will be avoided unless absolutely necessary. This keeps
548 the number of I/Os to the drive to a minimum. The default behav‐
549 ior is to set the write-mostly attribute for the specified PV.
550 It is also possible to remove the write-mostly flag by adding
551 the suffix :n at the end of the PV name, or to toggle the value
552 with the suffix :t. Repeat this option to change the attribute
553 on multiple PVs.
554 -y|--yes
556 Do not prompt for confirmation interactively but always assume
557 the answer yes. Use with extreme caution. (For automatic no,
558 see -qq.)
559 -Z|--zero y|n
561 Set zeroing mode for thin pool. Note: already provisioned blocks
562 from pool in non-zero mode are not cleared in unwritten parts
563 when setting --zero y.
564
566 VG
567 Volume Group name. See lvm(8) for valid names.
568 LV
570 Logical Volume name. See lvm(8) for valid names. An LV posi‐
571 tional arg generally includes the VG name and LV name, e.g.
572 VG/LV. LV followed by _<type> indicates that an LV of the given
573 type is required. (raid represents raid<N> type)
574 Tag
576 Tag name. See lvm(8) for information about tag names and using
577 tags in place of a VG, LV or PV.
578 Select
580 Select indicates that a required positional parameter can be
581 omitted if the --select option is used. No arg appears in this
582 position.
583 String
585 See the option description for information about the string con‐
586 tent.
587 Size[UNIT]
589 Size is an input number that accepts an optional unit. Input
590 units are always treated as base two values, regardless of capi‐
591 talization, e.g. 'k' and 'K' both refer to 1024. The default
592 input unit is specified by letter, followed by |UNIT. UNIT rep‐
593 resents other possible input units: bBsSkKmMgGtTpPeE. b|B is
594 bytes, s|S is sectors of 512 bytes, k|K is kilobytes, m|M is
595 megabytes, g|G is gigabytes, t|T is terabytes, p|P is petabytes,
596 e|E is exabytes. (This should not be confused with the output
597 control --units, where capital letters mean multiple of 1000.)
598
600 See lvm(8) for information about environment variables used by lvm.
601 For example, LVM_VG_NAME can generally be substituted for a required VG
602 parameter.
603
605 Change LV permission to read-only:
606 lvchange -pr vg00/lvol1
608
610 lvm(8) lvm.conf(5) lvmconfig(8)
611 pvchange(8) pvck(8) pvcreate(8) pvdisplay(8) pvmove(8) pvremove(8)
613 pvresize(8) pvs(8) pvscan(8)
614 vgcfgbackup(8) vgcfgrestore(8) vgchange(8) vgck(8) vgcreate(8) vgcon‐
616 vert(8) vgdisplay(8) vgexport(8) vgextend(8) vgimport(8) vgimport‐
617 clone(8) vgmerge(8) vgmknodes(8) vgreduce(8) vgremove(8) vgrename(8)
618 vgs(8) vgscan(8) vgsplit(8)
619 lvcreate(8) lvchange(8) lvconvert(8) lvdisplay(8) lvextend(8) lvre‐
621 duce(8) lvremove(8) lvrename(8) lvresize(8) lvs(8) lvscan(8)
622 lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeacti‐
624 vate(8) lvmdump(8)
625 dmeventd(8) lvmpolld(8) lvmlockd(8) lvmlockctl(8) cmirrord(8) lvmd‐
627 busd(8)
628 lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)
630Red Hat, Inc. LVM TOOLS 2.03.10(2) (2020-08-09) LVCHANGE(8)