PV\VG\LV对LVM分区的操作测试；
[root@station dev]# pvscan
PV /dev/sda2 VG rhel_linuxprobe lvm2 [19.51 GiB / 0 free]
PV /dev/sdb VG rhel_linuxprobe lvm2 [1020.00 MiB / 720.00 MiB free]
Total: 2 [20.50 GiB] / in use: 2 [20.50 GiB] / in no VG: 0 [0 ]
[root@station dev]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "rhel_linuxprobe" using metadata type lvm2
[root@station dev]# lvscan
ACTIVE '/dev/rhel_linuxprobe/swap' [2.00 GiB] inherit
ACTIVE '/dev/rhel_linuxprobe/root' [17.51 GiB] inherit
ACTIVE '/dev/rhel_linuxprobe/vo' [300.00 MiB] inherit
[root@station dev]# lvdisplay
--- Logical volume ---
LV Path /dev/rhel_linuxprobe/swap
LV Name swap
VG Name rhel_linuxprobe
LV UUID 3Rgw9D-oAjx-LWxR-C0Uo-mWij-6hbo-mY8lfm
LV Write Access read/write
LV Creation host, time localhost, 2018-03-27 04:19:31 +0800
LV Status available
# open 2
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/rhel_linuxprobe/root
LV Name root
VG Name rhel_linuxprobe
LV UUID tYTNA7-PAgV-CNPQ-jMCI-zfp0-n8x2-rf4UZb
LV Write Access read/write
LV Creation host, time localhost, 2018-03-27 04:19:32 +0800
LV Status available
# open 1
LV Size 17.51 GiB
Current LE 4482
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/rhel_linuxprobe/vo
LV Name vo
VG Name rhel_linuxprobe
LV UUID YeYKqD-SQtV-dugf-2BOC-W3Yz-8pPV-ALhpEK
LV Write Access read/write
LV Creation host, time station.domain1.example.com, 2019-08-29 22:04:02 +0800
LV Status available
# open 0
LV Size 300.00 MiB
Current LE 75
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
[root@station dev]#
[root@station dev]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name rhel_linuxprobe
PV Size 19.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 4994
Free PE 0
Allocated PE 4994
PV UUID 8Nx8r4-hFjx-jfle-X0jN-AZsj-t3lY-U1P4AV
--- Physical volume ---
PV Name /dev/sdb
VG Name rhel_linuxprobe
PV Size 1.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 255
Free PE 180
Allocated PE 75
PV UUID PzfHpe-c1yp-YKaH-Tjql-2rxy-BoG2-EOALQj
[root@station dev]# vgdisplay
--- Volume group ---
VG Name rhel_linuxprobe
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 9
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 20.50 GiB
PE Size 4.00 MiB
Total PE 5249
Alloc PE / Size 5069 / 19.80 GiB
Free PE / Size 180 / 720.00 MiB
VG UUID SjGdoP-sZ5D-oTdw-pXPn-26Kh-nOpp-eyvZXa
[root@station dev]# lsblk -f
NAME FSTYPE LABEL UUID MOUNTPOINT
sda
├─sda1 xfs 38a8699b-374f-457d-80ce-32981061b02a /boot
└─sda2 LVM2_member 8Nx8r4-hFjx-jfle-X0jN-AZsj-t3lY-U1P4AV
├─rhel_linuxprobe-swap swap ae318697-73a8-4ef6-88f3-0bf143f947cc [SWAP]
└─rhel_linuxprobe-root xfs b100e9de-a3a4-4148-867a-d86f0cd606be /
sdb LVM2_member PzfHpe-c1yp-YKaH-Tjql-2rxy-BoG2-EOALQj
└─rhel_linuxprobe-vo
至此，该lv已经建立，后续只要挂载就可使用；
如：
[root@station /]# lvscan
ACTIVE '/dev/rhel_linuxprobe/swap' [2.00 GiB] inherit
ACTIVE '/dev/rhel_linuxprobe/root' [17.51 GiB] inherit
ACTIVE '/dev/rhel_linuxprobe/vo' [300.00 MiB] inherit
[root@station /]# mount /dev/rhel_linuxprobe/vo /testdir_one/
mount: /dev/mapper/rhel_linuxprobe-vo is write-protected, mounting read-only
mount: unknown filesystem type '(null)'
[root@station /]# 此处提示该LV没有文件格式，然后格式化成xfs格式就好
[root@station /]#
[root@station /]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─rhel_linuxprobe-swap 253:0 0 2G 0 lvm [SWAP]
└─rhel_linuxprobe-root 253:1 0 17.5G 0 lvm /
sdb 8:16 0 1G 0 disk
└─rhel_linuxprobe-vo 253:2 0 300M 0 lvm
sr0 11:0 1 1024M 0 rom
[root@station /]# mkfs.xfs /dev/rhel_linuxprobe/vo
meta-data=/dev/rhel_linuxprobe/vo isize=256 agcount=4, agsize=19200 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=76800, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@station /]#
[root@station /]# mount /dev/rhel_linuxprobe/vo /testdir_one/
[root@station /]#
[root@station /]#
[root@station /]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─rhel_linuxprobe-swap 253:0 0 2G 0 lvm [SWAP]
└─rhel_linuxprobe-root 253:1 0 17.5G 0 lvm /
sdb 8:16 0 1G 0 disk
└─rhel_linuxprobe-vo 253:2 0 300M 0 lvm /testdir_one
sr0 11:0 1 1024M 0 rom
[root@station /]#
