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'lvchange' is used to alter a RAID 1 logical volume's write-mostly and
write-behind characteristics. The '--writemostly' parameter takes a
PV as an argument with an optional trailing character to specify whether
to set ('y'), unset ('n'), or toggle ('t') the value. If no trailing
character is given, it will set the flag.
Synopsis:
lvchange [--writemostly <PV>:{t|y|n}] [--writebehind <count>] vg/lv
Example:
lvchange --writemostly /dev/sdb1:y --writebehind 512 vg/raid1_lv
The last character in the 'lv_attr' field is used to show whether a device
has the WriteMostly flag set. It is signified with a 'w'. If the device
has failed, the 'p'artial flag has priority.
Example ("nosync" raid1 with mismatch_cnt and writemostly):
[~]# lvs -a --segment vg
LV VG Attr #Str Type SSize
raid1 vg Rwi---r-m 2 raid1 500.00m
[raid1_rimage_0] vg Iwi---r-- 1 linear 500.00m
[raid1_rimage_1] vg Iwi---r-w 1 linear 500.00m
[raid1_rmeta_0] vg ewi---r-- 1 linear 4.00m
[raid1_rmeta_1] vg ewi---r-- 1 linear 4.00m
Example (raid1 with mismatch_cnt, writemostly - but failed drive):
[~]# lvs -a --segment vg
LV VG Attr #Str Type SSize
raid1 vg rwi---r-p 2 raid1 500.00m
[raid1_rimage_0] vg Iwi---r-- 1 linear 500.00m
[raid1_rimage_1] vg Iwi---r-p 1 linear 500.00m
[raid1_rmeta_0] vg ewi---r-- 1 linear 4.00m
[raid1_rmeta_1] vg ewi---r-p 1 linear 4.00m
A new reportable field has been added for writebehind as well. If
write-behind has not been set or the LV is not RAID1, the field will
be blank.
Example (writebehind is set):
[~]# lvs -a -o name,attr,writebehind vg
LV Attr WBehind
lv rwi-a-r-- 512
[lv_rimage_0] iwi-aor-w
[lv_rimage_1] iwi-aor--
[lv_rmeta_0] ewi-aor--
[lv_rmeta_1] ewi-aor--
Example (writebehind is not set):
[~]# lvs -a -o name,attr,writebehind vg
LV Attr WBehind
lv rwi-a-r--
[lv_rimage_0] iwi-aor-w
[lv_rimage_1] iwi-aor--
[lv_rmeta_0] ewi-aor--
[lv_rmeta_1] ewi-aor--
210 lines
6.4 KiB
Groff
210 lines
6.4 KiB
Groff
.TH LVS 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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lvs \- report information about logical volumes
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.SH SYNOPSIS
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.B lvs
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.RB [ \-\-aligned ]
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.RB [ \-a | \-\-all ]
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.RB [ \-d | \-\-debug ]
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.RB [ \-h | \-? | \-\-help ]
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.RB [ \-\-ignorelockingfailure ]
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.RB [ \-\-nameprefixes ]
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.RB [ \-\-noheadings ]
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.RB [ \-\-nosuffix ]
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.RB [ \-o | \-\-options
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.RI [ + ] Field [, Field ]]
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.RB [ \-O | \-\-sort
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.RI [ + | \- ] Key1 [,[ + | \- ] Key2 [,...]]]
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.RB [ \-P | \-\-partial ]
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.RB [ \-\-rows ]
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.RB [ \-\-separator
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.IR Separator ]
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.RB [ \-\-segments ]
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.RB [ \-\-unbuffered ]
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.RB [ \-\-units
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.IR hHbBsSkKmMgGtTpPeE ]
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.RB [ \-\-unquoted ]
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.RB [ \-v | \-\-verbose ]
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.RB [ \-\-version ]
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.RI [ VolumeGroupName
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.RI [ VolumeGroupName ...]]
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.SH DESCRIPTION
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lvs produces formatted output about logical volumes.
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.SH OPTIONS
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See
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.BR lvm (8)
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for common options.
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.TP
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.B \-\-aligned
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Use with \fB\-\-separator\fP to align the output columns.
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.TP
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.B \-\-all
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Include information in the output about internal Logical Volumes that
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are components of normally-accessible Logical Volumes, such as mirrors,
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but which are not independently accessible (e.g. not mountable).
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The names of such Logical Volumes are enclosed within square brackets
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in the output. For example, after creating a mirror using
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.B lvcreate -m1 --mirrorlog disk
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, this option will reveal three internal Logical
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Volumes, with suffixes mimage_0, mimage_1, and mlog.
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.TP
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.B \-\-nameprefixes
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Add an "LVM2_" prefix plus the field name to the output. Useful
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with \fB\-\-noheadings\fP to produce a list of field=value pairs that can
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be used to set environment variables (for example, in
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.BR udev (7)
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rules).
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.TP
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.B \-\-noheadings
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Suppress the headings line that is normally the first line of output.
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Useful if grepping the output.
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.TP
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.B \-\-nosuffix
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Suppress the suffix on output sizes. Use with \fB\-\-units\fP
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(except h and H) if processing the output.
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.TP
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.BR \-o ", " \-\-options
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Comma-separated ordered list of columns. Precede the list with '\fI+\fP'
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to append to the default selection of columns instead of replacing it.
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.IP
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Use \fB\-o lv_all\fP to select all logical volume columns,
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and \fB\-o seg_all\fP
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to select all logical volume segment columns.
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.IP
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Use \fB\-o help\fP to view the full list of columns available.
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.IP
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Column names include:
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chunk_size,
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convert_lv,
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copy_percent,
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data_lv,
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devices,
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discards,
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lv_attr,
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lv_host,
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lv_kernel_major,
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lv_kernel_minor,
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lv_kernel_read_ahead,
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lv_major,
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lv_minor,
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lv_name,
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lv_path,
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lv_read_ahead,
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lv_size,
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lv_tags,
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lv_time,
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lv_uuid,
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metadata_lv,
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mirror_log,
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mismatches,
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modules,
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move_pv,
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origin,
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origin_size,
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pool_lv,
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region_size,
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segtype,
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seg_count,
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seg_pe_ranges,
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seg_size,
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seg_start,
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seg_start_pe,
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seg_tags,
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snap_percent,
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stripes,
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stripe_size,
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sync_action,
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sync_percent,
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thin_count,
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transaction_id,
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writebehind,
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zero.
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.IP
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With \fB\-\-segments\fP, any "seg_" prefixes are optional;
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otherwise any "lv_" prefixes are optional. Columns mentioned in
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.BR vgs (8)
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can also be chosen.
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.IP
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The lv_attr bits are:
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.RS
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.IP 1 3
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Volume type: (m)irrored, (M)irrored without initial sync, (o)rigin,
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(O)rigin with merging snapshot, (r)aid, (R)aid without initial sync,
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(s)napshot, merging (S)napshot, (p)vmove, (v)irtual,
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mirror or raid (i)mage, mirror or raid (I)mage out-of-sync, mirror (l)og device,
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under (c)onversion, thin (V)olume, (t)hin pool, (T)hin pool data, raid or
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thin pool m(e)tadata
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.IP 2 3
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Permissions: (w)riteable, (r)ead-only, (R)ead-only activation of non-read-only
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volume
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.IP 3 3
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Allocation policy: (a)nywhere, (c)ontiguous, (i)nherited, c(l)ing, (n)ormal
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This is capitalised if the volume is currently locked against allocation
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changes, for example during
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.BR pvmove (8).
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.IP 4 3
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fixed (m)inor
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.IP 5 3
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State: (a)ctive, (s)uspended, (I)nvalid snapshot, invalid (S)uspended snapshot,
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snapshot (m)erge failed, suspended snapshot (M)erge failed,
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mapped (d)evice present without tables, mapped device present with (i)nactive table
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.IP 6 3
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device (o)pen
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.IP 7 3
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Target type: (m)irror, (r)aid, (s)napshot, (t)hin, (u)nknown, (v)irtual.
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This groups logical volumes related to the same kernel target together. So,
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for example, mirror images, mirror logs as well as mirrors themselves appear as
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(m) if they use the original device-mapper mirror kernel driver; whereas the raid
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equivalents using the md raid kernel driver all appear as (r).
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Snapshots using the original device-mapper driver appear as (s); whereas
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snapshots of thin volumes using the new thin provisioning driver appear as (t).
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.IP 8 3
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Newly-allocated data blocks are overwritten with blocks of (z)eroes before use.
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.IP 9 3
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Volume Health: (p)artial, (r)efresh needed, (m)ismatches exist, (w)ritemostly.
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(p)artial signifies that one or more of the Physical Volumes this Logical
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Volume uses is missing from the system. (r)efresh signifies that one or
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more of the Physical Volumes this RAID Logical Volume uses had suffered a
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write error. The write error could be due to a temporary failure of that
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Physical Volume or an indication that it is failing. The device should be
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refreshed or replaced. (m)ismatches signifies that the RAID logical volume
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has portions of the array that are not coherent or that the array has
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recently repaired inconsistencies. An additional "check" after a "repair"
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of a RAID logical volume will clear this flag if no additional discrepancies
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are found. ("check" and "repair" of a RAID Logical Volume can be done via
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the 'lvchange' command.) (w)ritemostly signifies the devices in a RAID 1
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logical volume that have been marked write-mostly.
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.RE
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.TP
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.BR \-O ", " \-\-sort
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Comma-separated ordered list of columns to sort by. Replaces the default
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selection. Precede any column with '\fI\-\fP' for a reverse sort on that column.
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.TP
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.B \-\-rows
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Output columns as rows.
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.TP
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.B \-\-segments
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Use default columns that emphasize segment information.
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.TP
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.B \-\-separator \fISeparator
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String to use to separate each column. Useful if grepping the output.
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.TP
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.B \-\-unbuffered
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Produce output immediately without sorting or aligning the columns properly.
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.TP
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.B \-\-units \fIhHbBsSkKmMgGtTpPeE
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All sizes are output in these units: (h)uman-readable, (b)ytes, (s)ectors,
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(k)ilobytes, (m)egabytes, (g)igabytes, (t)erabytes, (p)etabytes, (e)xabytes.
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Capitalise to use multiples of 1000 (S.I.) instead of 1024. Can also specify
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custom units e.g. \fB\-\-units 3M\fP
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.TP
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.B \-\-unquoted
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When used with \fB\-\-nameprefixes\fP, output values in the field=value
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pairs are not quoted.
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.SH SEE ALSO
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.BR lvm (8),
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.BR lvdisplay (8),
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.BR pvs (8),
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.BR vgs (8)
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