LVM 管理之三:格式化输出

今天学习了下 LVM 输出格式化的内容,显示LVM信息常用 pvs,lvs,vgs 命令,如果想显示详细信息可以使用 pvdisplay ,vgdisplay ,lvdisplay,其中前面命令仅用于简单输出 lvm 对象相关信息,可以格式化输出;第二种命令会详细显示 lvm 对像信息,但不易于格式化输出。

PVS、LVS、VGS 使用

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显示物理卷(pv)信息  
[root@redhat6 lvm]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g

显示逻辑卷组(vg)信息
[root@redhat6 lvm]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g

显示逻辑卷(lv)信息
[root@redhat6 lvm]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_pgdata_01 vg_redhat6 -wi-ao 700.00m
lv_root vg_redhat6 -wi-ao 13.10g
lv_swap vg_redhat6 -wi-ao 1.91g

备注:前面的 pvs,lvs,vgs命令简单显示 LVM对像信息,都是默认的输出。

格式化控制

2.1 显示额外信息

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[root@redhat6 lvm]# pvs -v  
Scanning for physical volume names
PV VG Fmt Attr PSize PFree DevSize PV UUID
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0 14.51g dpTW84-DHRy-PIA9-u1tY-YUH4-XQKw-8Hy2Zm
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g 4.00g YKIQwX-zc6H-TZ65-P3qr-sRfk-LX0p-T18vdG

[root@redhat6 lvm]# vgs -v
Finding all volume groups
Finding volume group "vg_redhat6"
VG Attr Ext #PV #LV #SN VSize VFree VG UUID
vg_redhat6 wz--n- 4.00m 2 3 0 18.50g 2.81g E6cA2U-TL1x-ScCV-UnGU-3Kq4-1u6V-WUb5L4

备注:增加 -v 参数,会显示LVM 对像的额外信息,例如 UUID字段。

2.2 pvs 默认输出

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[root@redhat6 lvm]# pvs  
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g

2.3 只显示 pv_name,dev_size 字段

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[root@redhat6 lvm]# pvs -o pv_name,dev_size  
PV DevSize
/dev/sda2 14.51g
/dev/sdb 4.00g

备注:增加 -o 参数,指定需要输出的字段。

2.4 在pvs 默认输出上,增加字段

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[root@redhat6 lvm]# pvs  
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g
[root@redhat6 lvm]# pvs -o +pv_uuid
PV VG Fmt Attr PSize PFree PV UUID
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0 dpTW84-DHRy-PIA9-u1tY-YUH4-XQKw-8Hy2Zm
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g YKIQwX-zc6H-TZ65-P3qr-sRfk-LX0p-T18vdG

备注:如果想在默认输出的前提下增加字段,可以使用 -o + 字段名。

2.5 vgs 显示卷组成员

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[root@redhat6 lvm]# vgs  
VG #PV #LV #SN Attr VSize VFree
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g

[root@redhat6 lvm]# vgs -o +lv_name
VG #PV #LV #SN Attr VSize VFree LV
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g lv_root
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g lv_swap
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g lv_pgdata_01

字段排序

3.1 根据 lv_size 字段排序

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[root@redhat6 lvm]# lvs  
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_pgdata_01 vg_redhat6 -wi-ao 700.00m
lv_root vg_redhat6 -wi-ao 13.10g
lv_swap vg_redhat6 -wi-ao 1.91g

[root@redhat6 lvm]# lvs -O lv_size
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_pgdata_01 vg_redhat6 -wi-ao 700.00m
lv_swap vg_redhat6 -wi-ao 1.91g
lv_root vg_redhat6 -wi-ao 13.10g

备注:如果想根据输出字段排序,可以使用 -O 字段名 选项。

附 LVS、VGS、PVS 输出

4.1 lvs 字段

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lv_all - All fields in this section.  
lv_uuid - Unique identifier.
lv_name - Name. LVs created for internal use are enclosed in brackets.
lv_path - Full pathname for LV.
lv_attr - Various attributes - see man page.
lv_major - Persistent major number or -1 if not persistent.
lv_minor - Persistent minor number or -1 if not persistent.
lv_read_ahead - Read ahead setting in current units.
lv_kernel_major - Currently assigned major number or -1 if LV is not active.
lv_kernel_minor - Currently assigned minor number or -1 if LV is not active.
lv_kernel_read_ahead - Currently-in-use read ahead setting in current units.
lv_size - Size of LV in current units.
seg_count - Number of segments in LV.
origin - For snapshots, the origin device of this LV.
origin_size - For snapshots, the size of the origin device of this LV.
snap_percent - For snapshots, the percentage full if LV is active.
copy_percent - For mirrors and pvmove, current percentage in-sync.
move_pv - For pvmove, Source PV of temporary LV created by pvmove.
convert_lv - For lvconvert, Name of temporary LV created by lvconvert.
lv_tags - Tags, if any.
mirror_log - For mirrors, the LV holding the synchronisation log.
modules - Kernel device-mapper modules required for this LV.

4.2 pvs 字段

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pv_all - All fields in this section.  
pe_start - Offset to the start of data on the underlying device.
pv_size - Size of PV in current units.
pv_free - Total amount of unallocated space in current units.
pv_used - Total amount of allocated space in current units.
pv_attr - Various attributes - see man page.
pv_pe_count - Total number of Physical Extents.
pv_pe_alloc_count - Total number of allocated Physical Extents.
pv_tags - Tags, if any.
pv_mda_count - Number of metadata areas on this device.
pv_mda_used_count - Number of metadata areas in use on this device.

4.3 vgs 字段

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vg_all - All fields in this section.  
vg_fmt - Type of metadata.
vg_uuid - Unique identifier.
vg_name - Name.
vg_attr - Various attributes - see man page.
vg_size - Total size of VG in current units.
vg_free - Total amount of free space in current units.
vg_sysid - System ID indicating when and where it was created.
vg_extent_size - Size of Physical Extents in current units.
vg_extent_count - Total number of Physical Extents.
vg_free_count - Total number of unallocated Physical Extents.
max_lv - Maximum number of LVs allowed in VG or 0 if unlimited.
max_pv - Maximum number of PVs allowed in VG or 0 if unlimited.
pv_count - Number of PVs.
lv_count - Number of LVs.
snap_count - Number of snapshots.
vg_seqno - Revision number of internal metadata. Incremented whenever it changes.
vg_tags - Tags, if any.
vg_mda_count - Number of metadata areas on this VG.
vg_mda_used_count - Number of metadata areas in use on this VG.
vg_mda_free - Free metadata area space for this VG in current units.
vg_mda_size - Size of smallest metadata area for this VG in current units.
vg_mda_copies - Target number of in use metadata areas in the VG.

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