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4.9.2. Object Selection
This section provides a series of tables that list the information you can display about the LVM objects with the
pvs, vgs, and lvs commands.
For convenience, a field name prefix can be dropped if it matches the default for the command. For example, with the
pvs command, name means pv_name, but with the vgs command, name is interpreted as vg_name.
Executing the following command is the equivalent of executing
pvs -o pv_free.
The pvs Command
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Table 4.1, “pvs Display Fields” lists the display arguments of the
pvs command, along with the field name as it appears in the header display and a description of the field.
| Argument | Header | Description |
|---|---|---|
dev_size | DevSize | The size of the underlying device on which the physical volume was created |
pe_start | 1st PE | Offset to the start of the first physical extent in the underlying device |
pv_attr | Attr | Status of the physical volume: (a)llocatable or e(x)ported. |
pv_fmt | Fmt | The metadata format of the physical volume (lvm2 or lvm1) |
pv_free | PFree | The free space remaining on the physical volume |
pv_name | PV | The physical volume name |
pv_pe_alloc_count | Alloc | Number of used physical extents |
pv_pe_count | PE | Number of physical extents |
pvseg_size | SSize | The segment size of the physical volume |
pvseg_start | Start | The starting physical extent of the physical volume segment |
pv_size | PSize | The size of the physical volume |
pv_tags | PV Tags | LVM tags attached to the physical volume |
pv_used | Used | The amount of space currently used on the physical volume |
pv_uuid | PV UUID | The UUID of the physical volume |
The
pvs command displays the following fields by default: pv_name, vg_name, pv_fmt, pv_attr, pv_size, pv_free. The display is sorted by pv_name.
Using the
-v argument with the pvs command adds the following fields to the default display: dev_size, pv_uuid.
You can use the
--segments argument of the pvs command to display information about each physical volume segment. A segment is a group of extents. A segment view can be useful if you want to see whether your logical volume is fragmented.
The
pvs --segments command displays the following fields by default: pv_name, vg_name, pv_fmt, pv_attr, pv_size, pv_free, pvseg_start, pvseg_size. The display is sorted by pv_name and pvseg_size within the physical volume.
You can use the
pvs -a command to see devices detected by LVM that have not been initialized as LVM physical volumes.
The vgs Command
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Table 4.2, “vgs Display Fields” lists the display arguments of the
vgs command, along with the field name as it appears in the header display and a description of the field.
| Argument | Header | Description |
|---|---|---|
lv_count | #LV | The number of logical volumes the volume group contains |
max_lv | MaxLV | The maximum number of logical volumes allowed in the volume group (0 if unlimited) |
max_pv | MaxPV | The maximum number of physical volumes allowed in the volume group (0 if unlimited) |
pv_count | #PV | The number of physical volumes that define the volume group |
snap_count | #SN | The number of snapshots the volume group contains |
vg_attr | Attr | Status of the volume group: (w)riteable, (r)eadonly, resi(z)eable, e(x)ported, (p)artial and (c)lustered. |
vg_extent_count | #Ext | The number of physical extents in the volume group |
vg_extent_size | Ext | The size of the physical extents in the volume group |
vg_fmt | Fmt | The metadata format of the volume group (lvm2 or lvm1) |
vg_free | VFree | Size of the free space remaining in the volume group |
vg_free_count | Free | Number of free physical extents in the volume group |
vg_name | VG | The volume group name |
vg_seqno | Seq | Number representing the revision of the volume group |
vg_size | VSize | The size of the volume group |
vg_sysid | SYS ID | LVM1 System ID |
vg_tags | VG Tags | LVM tags attached to the volume group |
vg_uuid | VG UUID | The UUID of the volume group |
The
vgs command displays the following fields by default: vg_name, pv_count, lv_count, snap_count, vg_attr, vg_size, vg_free. The display is sorted by vg_name.
vgs
# vgs
VG #PV #LV #SN Attr VSize VFree
new_vg 3 1 1 wz--n- 51.42G 51.36G
Using the
-v argument with the vgs command adds the following fields to the default display: vg_extent_size, vg_uuid.
The lvs Command
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Table 4.3, “lvs Display Fields” lists the display arguments of the
lvs command, along with the field name as it appears in the header display and a description of the field.
| Argument | Header | Description | ||||||
|---|---|---|---|---|---|---|---|---|
| Chunk | Unit size in a snapshot volume | ||||||
copy_percent | Copy% | The synchronization percentage of a mirrored logical volume; also used when physical extents are being moved with the pv_move command | ||||||
devices | Devices | The underlying devices that make up the logical volume: the physical volumes, logical volumes, and start physical extents and logical extents | ||||||
lv_attr | Attr | The status of the logical volume. The logical volume attribute bits are as follows:
| ||||||
lv_kernel_major | KMaj | Actual major device number of the logical volume (-1 if inactive) | ||||||
lv_kernel_minor | KMIN | Actual minor device number of the logical volume (-1 if inactive) | ||||||
lv_major | Maj | The persistent major device number of the logical volume (-1 if not specified) | ||||||
lv_minor | Min | The persistent minor device number of the logical volume (-1 if not specified) | ||||||
lv_name | LV | The name of the logical volume | ||||||
lv_size | LSize | The size of the logical volume | ||||||
lv_tags | LV Tags | LVM tags attached to the logical volume | ||||||
lv_uuid | LV UUID | The UUID of the logical volume. | ||||||
mirror_log | Log | Device on which the mirror log resides | ||||||
modules | Modules | Corresponding kernel device-mapper target necessary to use this logical volume | ||||||
move_pv | Move | Source physical volume of a temporary logical volume created with the pvmove command | ||||||
origin | Origin | The origin device of a snapshot volume | ||||||
| Region | The unit size of a mirrored logical volume | ||||||
seg_count | #Seg | The number of segments in the logical volume | ||||||
seg_size | SSize | The size of the segments in the logical volume | ||||||
seg_start | Start | Offset of the segment in the logical volume | ||||||
seg_tags | Seg Tags | LVM tags attached to the segments of the logical volume | ||||||
segtype | Type | The segment type of a logical volume (for example: mirror, striped, linear) | ||||||
snap_percent | Snap% | Current percentage of a snapshot volume that is in use | ||||||
stripes | #Str | Number of stripes or mirrors in a logical volume | ||||||
| Stripe | Unit size of the stripe in a striped logical volume |
The
lvs command displays the following fields by default: lv_name, vg_name, lv_attr, lv_size, origin, snap_percent, move_pv, mirror_log, copy_percent. The default display is sorted by vg_name and lv_name within the volume group.
lvs
# lvs
LV VG Attr LSize Origin Snap% Move Log Copy%
lvol0 new_vg owi-a- 52.00M
newvgsnap1 new_vg swi-a- 8.00M lvol0 0.20
Using the
-v argauament with the lvs command adds the following fields to the default display: seg_count, lv_major, lv_minor, lv_kernel_major, lv_kernel_minor, lv_uuid.
You can use the
--segments argument of the lvs command to display information with default columns that emphasize the segment information. When you use the segments argument, the seg prefix is optional. The lvs --segments command displays the following fields by default: lv_name, vg_name, lv_attr, stripes, segtype, seg_size. The default display is sorted by vg_name, lv_name within the volume group, and seg_start within the logical volume. If the logical volumes were fragmented, the output from this command would show that.
Using the
-v argument with the lvs --segments command adds the following fields to the default display: seg_start, stripesize, chunksize.
The following example shows the default output of the
lvs command on a system with one logical volume configured, followed by the default output of the lvs command with the segments argument specified.
'%20d='M201.5%20305.5c-13.8%200-24.9-11.1-24.9-24.6%200-13.8%2011.1-24.9%2024.9-24.9%2013.6%200%2024.6%2011.1%2024.6%2024.9%200%2013.6-11.1%2024.6-24.6%2024.6zM504%20256c0%20137-111%20248-248%20248S8%20393%208%20256%20119%208%20256%208s248%20111%20248%20248zm-132.3-41.2c-9.4%200-17.7%203.9-23.8%2010-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3%2055.4%2012.5c0%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.3%2024.9-24.9s-11.1-24.9-24.9-24.9c-9.7%200-18%205.8-22.1%2013.8l-61.2-13.6c-3-.8-6.1%201.4-6.9%204.4l-19.1%2086.4c-33.2%201.4-63.1%2011.3-85.5%2026.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9%200-46.3%2046.9-14.4%2062.8-1.1%205-1.7%2010.2-1.7%2015.5%200%2052.6%2059.2%2095.2%20132%2095.2%2073.1%200%20132.3-42.6%20132.3-95.2%200-5.3-.6-10.8-1.9-15.8%2031.3-16%2019.8-62.5-14.9-62.5zM302.8%20331c-18.2%2018.2-76.1%2017.9-93.6%200-2.2-2.2-6.1-2.2-8.3%200-2.5%202.5-2.5%206.4%200%208.6%2022.8%2022.8%2087.3%2022.8%20110.2%200%202.5-2.2%202.5-6.1%200-8.6-2.2-2.2-6.1-2.2-8.3%200zm7.7-75c-13.6%200-24.6%2011.1-24.6%2024.9%200%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.1%2024.9-24.6%200-13.8-11-24.9-24.9-24.9z'/%3e%3c/svg%3e){kind=small}