lvm2/man/pvmove.8_pregen

.TH PVMOVE 8 "LVM TOOLS #VERSION#" "Red Hat, Inc."
.SH NAME
pvmove - Move extents from one physical volume to another
.
.SH SYNOPSIS
\fBpvmove\fP \fIposition_args\fP
.br
    [ \fIoption_args\fP ]
.br
    [ \fIposition_args\fP ]
.br
.SH DESCRIPTION
pvmove moves the allocated physical extents (PEs) on a source PV to one or
more destination PVs.  You can optionally specify a source LV in which
case only extents used by that LV will be moved to free (or specified)
extents on the destination PV. If no destination PV is specified, the
normal allocation rules for the VG are used.

If pvmove is interrupted for any reason (e.g. the machine crashes) then
run pvmove again without any PV arguments to restart any operations that
were in progress from the last checkpoint. Alternatively, use the abort
option at any time to abort the operation. The resulting location of LVs
after an abort depends on whether the atomic option was used.

More than one pvmove can run concurrently if they are moving data from
different source PVs, but additional pvmoves will ignore any LVs already
in the process of being changed, so some data might not get moved.
.SH USAGE
Move PV extents.
.br
.P
\fBpvmove\fP \fIPV\fP
.br
.RS 4
.ad l
[ \fB-A\fP|\fB--autobackup\fP \fBy\fP|\fBn\fP ]
.ad b
.br
.ad l
[ \fB-n\fP|\fB--name\fP \fILV\fP ]
.ad b
.br
.ad l
[    \fB--alloc\fP \fBcontiguous\fP|\fBcling\fP|\fBcling_by_tags\fP|\fBnormal\fP|\fBanywhere\fP|\fBinherit\fP ]
.ad b
.br
.ad l
[    \fB--atomic\fP ]
.ad b
.br
.ad l
[    \fB--noudevsync\fP ]
.ad b
.br
.ad l
[    \fB--reportformat\fP \fBbasic\fP|\fBjson\fP ]
.ad b
.br
[ COMMON_OPTIONS ]
.RE
.br
.RS 4
[ \fIPV\fP ... ]
.RE

Continue or abort existing pvmove operations.
.br
.P
\fBpvmove\fP
.br
.RS 4
[ COMMON_OPTIONS ]
.RE
.br

Common options for command:
.
.RS 4
.ad l
[ \fB-b\fP|\fB--background\fP ]
.ad b
.br
.ad l
[ \fB-i\fP|\fB--interval\fP \fINumber\fP ]
.ad b
.br
.ad l
[    \fB--abort\fP ]
.ad b
.RE

Common options for lvm:
.
.RS 4
.ad l
[ \fB-d\fP|\fB--debug\fP ]
.ad b
.br
.ad l
[ \fB-h\fP|\fB--help\fP ]
.ad b
.br
.ad l
[ \fB-q\fP|\fB--quiet\fP ]
.ad b
.br
.ad l
[ \fB-t\fP|\fB--test\fP ]
.ad b
.br
.ad l
[ \fB-v\fP|\fB--verbose\fP ]
.ad b
.br
.ad l
[ \fB-y\fP|\fB--yes\fP ]
.ad b
.br
.ad l
[    \fB--commandprofile\fP \fIString\fP ]
.ad b
.br
.ad l
[    \fB--config\fP \fIString\fP ]
.ad b
.br
.ad l
[    \fB--driverloaded\fP \fBy\fP|\fBn\fP ]
.ad b
.br
.ad l
[    \fB--lockopt\fP \fIString\fP ]
.ad b
.br
.ad l
[    \fB--longhelp\fP ]
.ad b
.br
.ad l
[    \fB--profile\fP \fIString\fP ]
.ad b
.br
.ad l
[    \fB--version\fP ]
.ad b
.RE
.SH OPTIONS
.HP
.ad l
\fB--abort\fP
.br
Abort any pvmove operations in progress. If a pvmove was started
with the --atomic option, then all LVs will remain on the source PV.
Otherwise, segments that have been moved will remain on the
destination PV, while unmoved segments will remain on the source PV.
.ad b
.HP
.ad l
\fB--alloc\fP \fBcontiguous\fP|\fBcling\fP|\fBcling_by_tags\fP|\fBnormal\fP|\fBanywhere\fP|\fBinherit\fP
.br
Determines the allocation policy when a command needs to allocate
Physical Extents (PEs) from the VG. Each VG and LV has an allocation policy
which can be changed with vgchange/lvchange, or overriden on the
command line.
\fBnormal\fP applies common sense rules such as not placing parallel stripes
on the same PV.
\fBinherit\fP applies the VG policy to an LV.
\fBcontiguous\fP requires new PEs be placed adjacent to existing PEs.
\fBcling\fP places new PEs on the same PV as existing PEs in the same
stripe of the LV.
If there are sufficient PEs for an allocation, but normal does not
use them, \fBanywhere\fP will use them even if it reduces performance,
e.g. by placing two stripes on the same PV.
Optional positional PV args on the command line can also be used to limit
which PVs the command will use for allocation.
See \fBlvm\fP(8) for more information about allocation.
.ad b
.HP
.ad l
\fB--atomic\fP
.br
Makes a pvmove operation atomic, ensuring that all affected LVs are
moved to the destination PV, or none are if the operation is aborted.
.ad b
.HP
.ad l
\fB-A\fP|\fB--autobackup\fP \fBy\fP|\fBn\fP
.br
Specifies if metadata should be backed up automatically after a change.
Enabling this is strongly advised! See \fBvgcfgbackup\fP(8) for more information.
.ad b
.HP
.ad l
\fB-b\fP|\fB--background\fP
.br
If the operation requires polling, this option causes the command to
return before the operation is complete, and polling is done in the
background.
.ad b
.HP
.ad l
\fB--commandprofile\fP \fIString\fP
.br
The command profile to use for command configuration.
See \fBlvm.conf\fP(5) for more information about profiles.
.ad b
.HP
.ad l
\fB--config\fP \fIString\fP
.br
Config settings for the command. These override lvm.conf settings.
The String arg uses the same format as lvm.conf,
or may use section/field syntax.
See \fBlvm.conf\fP(5) for more information about config.
.ad b
.HP
.ad l
\fB-d\fP|\fB--debug\fP ...
.br
Set debug level. Repeat from 1 to 6 times to increase the detail of
messages sent to the log file and/or syslog (if configured).
.ad b
.HP
.ad l
\fB--driverloaded\fP \fBy\fP|\fBn\fP
.br
If set to no, the command will not attempt to use device-mapper.
For testing and debugging.
.ad b
.HP
.ad l
\fB-h\fP|\fB--help\fP
.br
Display help text.
.ad b
.HP
.ad l
\fB-i\fP|\fB--interval\fP \fINumber\fP
.br
Report progress at regular intervals.
.ad b
.HP
.ad l
\fB--lockopt\fP \fIString\fP
.br
Used to pass options for special cases to lvmlockd.
See \fBlvmlockd\fP(8) for more information.
.ad b
.HP
.ad l
\fB--longhelp\fP
.br
Display long help text.
.ad b
.HP
.ad l
\fB-n\fP|\fB--name\fP \fIString\fP
.br
Move only the extents belonging to the named LV.
.ad b
.HP
.ad l
\fB--noudevsync\fP
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Disables udev synchronisation. The process will not wait for notification
from udev. It will continue irrespective of any possible udev processing
in the background. Only use this if udev is not running or has rules that
ignore the devices LVM creates.
.ad b
.HP
.ad l
\fB--profile\fP \fIString\fP
.br
An alias for --commandprofile or --metadataprofile, depending
on the command.
.ad b
.HP
.ad l
\fB-q\fP|\fB--quiet\fP ...
.br
Suppress output and log messages. Overrides --debug and --verbose.
Repeat once to also suppress any prompts with answer 'no'.
.ad b
.HP
.ad l
\fB--reportformat\fP \fBbasic\fP|\fBjson\fP
.br
Overrides current output format for reports which is defined globally by
the report/output_format setting in lvm.conf.
\fBbasic\fP is the original format with columns and rows.
If there is more than one report per command, each report is prefixed
with the report name for identification. \fBjson\fP produces report
output in JSON format. See \fBlvmreport\fP(7) for more information.
.ad b
.HP
.ad l
\fB-t\fP|\fB--test\fP
.br
Run in test mode. Commands will not update metadata.
This is implemented by disabling all metadata writing but nevertheless
returning success to the calling function. This may lead to unusual
error messages in multi-stage operations if a tool relies on reading
back metadata it believes has changed but hasn't.
.ad b
.HP
.ad l
\fB-v\fP|\fB--verbose\fP ...
.br
Set verbose level. Repeat from 1 to 4 times to increase the detail
of messages sent to stdout and stderr.
.ad b
.HP
.ad l
\fB--version\fP
.br
Display version information.
.ad b
.HP
.ad l
\fB-y\fP|\fB--yes\fP
.br
Do not prompt for confirmation interactively but always assume the
answer yes. Use with extreme caution.
(For automatic no, see -qq.)
.ad b
.SH VARIABLES
.HP
\fIPV\fP
.br
Physical Volume name, a device path under /dev.
For commands managing physical extents, a PV positional arg
generally accepts a suffix indicating a range (or multiple ranges)
of physical extents (PEs). When the first PE is omitted, it defaults
to the start of the device, and when the last PE is omitted it defaults to end.
Start and end range (inclusive): \fIPV\fP[\fB:\fP\fIPE\fP\fB-\fP\fIPE\fP]...
Start and length range (counting from 0): \fIPV\fP[\fB:\fP\fIPE\fP\fB+\fP\fIPE\fP]...
.HP
\fIString\fP
.br
See the option description for information about the string content.
.HP
\fISize\fP[UNIT]
.br
Size is an input number that accepts an optional unit.
Input units are always treated as base two values, regardless of
capitalization, e.g. 'k' and 'K' both refer to 1024.
The default input unit is specified by letter, followed by |UNIT.
UNIT represents other possible input units: \fBbBsSkKmMgGtTpPeE\fP.
b|B is bytes, s|S is sectors of 512 bytes, k|K is kilobytes,
m|M is megabytes, g|G is gigabytes, t|T is terabytes,
p|P is petabytes, e|E is exabytes.
(This should not be confused with the output control --units, where
capital letters mean multiple of 1000.)
.SH ENVIRONMENT VARIABLES
See \fBlvm\fP(8) for information about environment variables used by lvm.
For example, LVM_VG_NAME can generally be substituted for a required VG parameter.
.SH NOTES
pvmove works as follows:

1. A temporary 'pvmove' LV is created to store details of all the data
movements required.

2. Every LV in the VG is searched for contiguous data that need moving
according to the command line arguments.
For each piece of data found, a new segment is added to the end of the
pvmove LV.
This segment takes the form of a temporary mirror to copy the data
from the original location to a newly allocated location.
The original LV is updated to use the new temporary mirror segment
in the pvmove LV instead of accessing the data directly.

3. The VG metadata is updated on disk.

4. The first segment of the pvmove LV is activated and starts to mirror
the first part of the data.  Only one segment is mirrored at once as this
is usually more efficient.

5. A daemon repeatedly checks progress at the specified time interval.
When it detects that the first temporary mirror is in sync, it breaks that
mirror so that only the new location for that data gets used and writes a
checkpoint into the VG metadata on disk.  Then it activates the mirror for
the next segment of the pvmove LV.

6. When there are no more segments left to be mirrored, the temporary LV
is removed and the VG metadata is updated so that the LVs reflect the new
data locations.

Note that this new process cannot support the original LVM1
type of on-disk metadata.  Metadata can be converted using
\fBvgconvert\fP(8).

If the \fB--atomic\fP option is used, a slightly different approach is
used for the move.  Again, a temporary 'pvmove' LV is created to store the
details of all the data movements required.  This temporary LV contains
all the segments of the various LVs that need to be moved.  However, in
this case, an identical LV is allocated that contains the same number of
segments and a mirror is created to copy the contents from the first
temporary LV to the second.  After a complete copy is made, the temporary
LVs are removed, leaving behind the segments on the destination PV.  If an
abort is issued during the move, all LVs being moved will remain on the
source PV.

.SH EXAMPLES

Move all physical extents that are used by simple LVs on the specified PV to
free physical extents elsewhere in the VG.
.br
.B pvmove /dev/sdb1

Use a specific destination PV when moving physical extents.
.br
.B pvmove /dev/sdb1 /dev/sdc1

Move extents belonging to a single LV.
.br
.B pvmove -n lvol1 /dev/sdb1 /dev/sdc1

Rather than moving the contents of an entire device, it is possible to
move a range of physical extents, for example numbers 1000 to 1999
inclusive on the specified PV.
.br
.B pvmove /dev/sdb1:1000-1999

A range of physical extents to move can be specified as start+length. For
example, starting from PE 1000. (Counting starts from 0, so this refers to the
1001st to the 2000th PE inclusive.)
.br
.B pvmove /dev/sdb1:1000+1000

Move a range of physical extents to a specific PV (which must have
sufficient free extents).
.br
.B pvmove /dev/sdb1:1000-1999 /dev/sdc1

Move a range of physical extents to specific new extents on a new PV.
.br
.B pvmove /dev/sdb1:1000-1999 /dev/sdc1:0-999

If the source and destination are on the same disk, the
\fBanywhere\fP allocation policy is needed.
.br
.B pvmove --alloc anywhere /dev/sdb1:1000-1999 /dev/sdb1:0-999

The part of a specific LV present within in a range of physical
extents can also be picked out and moved.
.br
.B pvmove -n lvol1 /dev/sdb1:1000-1999 /dev/sdc1
.SH SEE ALSO

.BR lvm (8)
.BR lvm.conf (5)
.BR lvmconfig (8)

.BR pvchange (8)
.BR pvck (8)
.BR pvcreate (8)
.BR pvdisplay (8)
.BR pvmove (8)
.BR pvremove (8)
.BR pvresize (8)
.BR pvs (8)
.BR pvscan (8) 

.BR vgcfgbackup (8)
.BR vgcfgrestore (8)
.BR vgchange (8)
.BR vgck (8)
.BR vgcreate (8)
.BR vgconvert (8)
.BR vgdisplay (8)
.BR vgexport (8)
.BR vgextend (8)
.BR vgimport (8)
.BR vgimportclone (8)
.BR vgmerge (8)
.BR vgmknodes (8)
.BR vgreduce (8)
.BR vgremove (8)
.BR vgrename (8)
.BR vgs (8)
.BR vgscan (8)
.BR vgsplit (8) 

.BR lvcreate (8)
.BR lvchange (8)
.BR lvconvert (8)
.BR lvdisplay (8)
.BR lvextend (8)
.BR lvreduce (8)
.BR lvremove (8)
.BR lvrename (8)
.BR lvresize (8)
.BR lvs (8)
.BR lvscan (8)

.BR lvm-fullreport (8)
.BR lvm-lvpoll (8)
.BR lvm2-activation-generator (8)
.BR blkdeactivate (8)
.BR lvmdump (8)

.BR dmeventd (8)
.BR lvmetad (8)
.BR lvmpolld (8)
.BR lvmlockd (8)
.BR lvmlockctl (8)
.BR clvmd (8)
.BR cmirrord (8)
.BR lvmdbusd (8)

.BR lvmsystemid (7)
.BR lvmreport (7)
.BR lvmraid (7)
.BR lvmthin (7)
.BR lvmcache (7)