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New options to 'lvchange' allow users to scrub their RAID LVs.
Synopsis:
lvchange --syncaction {check|repair} vg/raid_lv
RAID scrubbing is the process of reading all the data and parity blocks in
an array and checking to see whether they are coherent. 'lvchange' can
now initaite the two scrubbing operations: "check" and "repair". "check"
will go over the array and recored the number of discrepancies but not
repair them. "repair" will correct the discrepancies as it finds them.
'lvchange --syncaction repair vg/raid_lv' is not to be confused with
'lvconvert --repair vg/raid_lv'. The former initiates a background
synchronization operation on the array, while the latter is designed to
repair/replace failed devices in a mirror or RAID logical volume.
Additional reporting has been added for 'lvs' to support the new
operations. Two new printable fields (which are not printed by
default) have been added: "syncaction" and "mismatches". These
can be accessed using the '-o' option to 'lvs', like:
lvs -o +syncaction,mismatches vg/lv
"syncaction" will print the current synchronization operation that the
RAID volume is performing. It can be one of the following:
- idle: All sync operations complete (doing nothing)
- resync: Initializing an array or recovering after a machine failure
- recover: Replacing a device in the array
- check: Looking for array inconsistencies
- repair: Looking for and repairing inconsistencies
The "mismatches" field with print the number of descrepancies found during
a check or repair operation.
The 'Cpy%Sync' field already available to 'lvs' will print the progress
of any of the above syncactions, including check and repair.
Finally, the lv_attr field has changed to accomadate the scrubbing operations
as well. The role of the 'p'artial character in the lv_attr report field
as expanded. "Partial" is really an indicator for the health of a
logical volume and it makes sense to extend this include other health
indicators as well, specifically:
'm'ismatches: Indicates that there are discrepancies in a RAID
LV. This character is shown after a scrubbing
operation has detected that portions of the RAID
are not coherent.
'r'efresh : Indicates that a device in a RAID array has suffered
a failure and the kernel regards it as failed -
even though LVM can read the device label and
considers the device to be ok. The LV should be
'r'efreshed to notify the kernel that the device is
now available, or the device should be 'r'eplaced
if it is suspected of failing.
184 lines
7.0 KiB
Groff
184 lines
7.0 KiB
Groff
.TH LVCHANGE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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lvchange \- change attributes of a logical volume
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.SH SYNOPSIS
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.B lvchange
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.RB [ \-\-addtag
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.IR Tag ]
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.RB [ \-A | \-\-autobackup
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.RI { y | n }]
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.RB [ \-a | \-\-activate
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.RI [ a | e | l ]{ y | n }]
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.RB [ \-\-alloc
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.IR AllocationPolicy ]
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.RB [ \-C | \-\-contiguous
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.RI { y | n }]
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.RB [ \-d | \-\-debug ]
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.RB [ \-\-deltag
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.IR Tag ]
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.RB [ \-\-discards
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.RI { ignore | nopassdown | passdown }]
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.RB [ \-\-resync ]
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.RB [ \-h | \-? | \-\-help ]
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.RB [ \-\-ignorelockingfailure ]
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.RB [ \-\-ignoremonitoring ]
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.RB [ \-\-monitor
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.RI { y | n }]
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.RB [ \-\-poll
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.RI { y | n }]
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.RB [ \-\-syncaction
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.RI { check | repair }]
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.RB [ \-\-sysinit ]
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.RB [ \-\-noudevsync ]
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.RB [ \-M | \-\-persistent
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.RI { y | n }]
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.RB [ \-\-minor
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.IR minor ]
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.RB [ \-P | \-\-partial ]
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.RB [ \-p | \-\-permission
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.RI { r | rw }]
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.RB [ \-r | \-\-readahead
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.RI { ReadAheadSectors | auto | none }]
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.RB [ \-\-refresh ]
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.RB [ \-t | \-\-test ]
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.RB [ \-v | \-\-verbose ]
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.RB [ \-Z | \-\-zero
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.RI { y | n }]
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.I LogicalVolumePath
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.RI [ LogicalVolumePath ...]
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.SH DESCRIPTION
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lvchange allows you to change the attributes of a logical volume
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including making them known to the kernel ready for use.
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.SH OPTIONS
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See \fBlvm\fP(8) for common options.
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.TP
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.BR \-a ", " \-\-activate " [" \fIa | \fIe | \fIl ]{ \fIy | \fIn }
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Controls the availability of the logical volumes for use.
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Communicates with the kernel device-mapper driver via
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libdevmapper to activate (\-ay) or deactivate (\-an) the
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logical volumes. If autoactivation option is used (\-aay),
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the logical volume is activated only if it matches an item in
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the activation/auto_activation_volume_list set in lvm.conf.
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Autoactivation is not yet supported for logical volumes that
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are part of partial or clustered volume groups.
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.IP
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If clustered locking is enabled, -aey will activate exclusively
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on one node and -aly will activate only on the local node.
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To deactivate only on the local node use -aln.
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Logical volumes with single-host snapshots are always activated
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exclusively because they can only be used on one node at once.
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.TP
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.BR \-C ", " \-\-contiguous " {" \fIy | \fIn }
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Tries to set or reset the contiguous allocation policy for
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logical volumes. It's only possible to change a non-contiguous
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logical volume's allocation policy to contiguous, if all of the
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allocated physical extents are already contiguous.
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.TP
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.BR \-\-discards " {" \fIignore | \fInopassdown | \fIpassdown }
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Set this to \fIignore\fP to ignore any discards received by a
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thin pool Logical Volume. Set to \fInopassdown\fP to process such
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discards within the thin pool itself and allow the no-longer-needed
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extents to be overwritten by new data. Set to \fIpassdown\fP (the
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default) to process them both within the thin pool itself and to
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pass them down the underlying device.
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.TP
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.B \-\-resync
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Forces the complete resynchronization of a mirror. In normal
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circumstances you should not need this option because synchronization
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happens automatically. Data is read from the primary mirror device
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and copied to the others, so this can take a considerable amount of
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time - and during this time you are without a complete redundant copy
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of your data.
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.TP
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.B \-\-minor \fIminor
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Set the minor number.
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.TP
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.BR \-\-monitor " {" \fIy | \fIn }
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Start or stop monitoring a mirrored or snapshot logical volume with
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dmeventd, if it is installed.
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If a device used by a monitored mirror reports an I/O error,
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the failure is handled according to
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\fBmirror_image_fault_policy\fP and \fBmirror_log_fault_policy\fP
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set in \fBlvm.conf\fP.
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.TP
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.BR \-\-poll " {" \fIy | \fIn }
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Without polling a logical volume's backgrounded transformation process
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will never complete. If there is an incomplete pvmove or lvconvert (for
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example, on rebooting after a crash), use \fB\-\-poll y\fP to restart the
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process from its last checkpoint. However, it may not be appropriate to
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immediately poll a logical volume when it is activated, use
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\fB\-\-poll n\fP to defer and then \fB\-\-poll y\fP to restart the process.
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.TP
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.BR \-\-syncaction " {" \fIcheck | \fIrepair }
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This argument is used to initiate various RAID synchronization operations.
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The \fIcheck\fP and \fIrepair\fP options provide a way to check the
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integrity of a RAID logical volume (often referred to as "scrubbing").
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These options cause the RAID logical volume to
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read all of the data and parity blocks in the array and check for any
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discrepancies (e.g. mismatches between mirrors or incorrect parity values).
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If \fIcheck\fP is used, the discrepancies will be counted but not repaired.
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If \fIrepair\fP is used, the discrepancies will be corrected as they are
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encountered. The 'lvs' command can be used to show the number of
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discrepancies found or repaired.
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.TP
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.B \-\-sysinit
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Indicates that \fBlvchange\fP(8) is being invoked from early system
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initialisation scripts (e.g. rc.sysinit or an initrd),
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before writeable filesystems are available. As such,
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some functionality needs to be disabled and this option
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acts as a shortcut which selects an appropriate set of options. Currently
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this is equivalent to using \fB\-\-ignorelockingfailure\fP,
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\fB\-\-ignoremonitoring\fP, \fB\-\-poll n\fP and setting
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\fBLVM_SUPPRESS_LOCKING_FAILURE_MESSAGES\fP
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environment variable.
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If \fB\-\-sysinit\fP is used in conjunction with lvmetad(8) enabled and running,
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autoactivation is preferred over manual activation via direct lvchange call.
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Logical volumes are autoactivated according to auto_activation_volume_list
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set in lvm.conf(5).
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.TP
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.B \-\-noudevsync
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Disable udev synchronisation. The
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process will not wait for notification from udev.
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It will continue irrespective of any possible udev processing
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in the background. You should only use this if udev is not running
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or has rules that ignore the devices LVM2 creates.
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.TP
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.B \-\-ignoremonitoring
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Make no attempt to interact with dmeventd unless \fB\-\-monitor\fP
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is specified.
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Do not use this if dmeventd is already monitoring a device.
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.TP
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.BR \-M ", " \-\-persistent " {" \fIy | \fIn }
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Set to y to make the minor number specified persistent.
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.TP
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.BR \-p ", " \-\-permission " {" \fIr | \fIrw }
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Change access permission to read-only or read/write.
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.TP
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.BR \-r ", " \-\-readahead " {" \fIReadAheadSectors | \fIauto | \fInone }
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Set read ahead sector count of this logical volume.
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For volume groups with metadata in lvm1 format, this must
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be a value between 2 and 120 sectors.
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The default value is "auto" which allows the kernel to choose
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a suitable value automatically.
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"None" is equivalent to specifying zero.
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.TP
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.B \-\-refresh
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If the logical volume is active, reload its metadata.
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This is not necessary in normal operation, but may be useful
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if something has gone wrong or if you're doing clustering
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manually without a clustered lock manager.
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.TP
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.BR \-Z ", " \-\-zero " {" \fIy | \fIn }
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Set zeroing mode for thin pool. Note: already provisioned blocks from pool
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in non-zero mode are not cleared in unwritten parts when setting zero to
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\fIy\fP.
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.SH Examples
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Changes the permission on volume lvol1 in volume group vg00 to be read-only:
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.sp
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.B lvchange -pr vg00/lvol1
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.SH SEE ALSO
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.BR lvm (8),
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.BR lvcreate (8),
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.BR vgchange (8)
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