一、磁盘管理
步骤：
1. 物理磁盘被格式化为PV，空间被划分成一个个PE;
2. 不同的PV加入同一个VG中，不同PV的PE全部进入VG的PE池；
3. 在VG中基于PE创建LV，组成LV的PE可能来自于不同的物理磁盘；
4. LV直接格式化后挂在使用；
5. LV的增加或减少其实就是增加或减少该组LV的PE数量，其过程不会丢失原始数据。
操作步骤：
①查看待分配的磁盘
[root@cen7 ~]# fdisk -l
Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a39f5
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 452607 225280 83 Linux
/dev/sda2 452608 415227903 207387648 83 Linux
/dev/sda3 415227904 419422207 2097152 82 Linux swap / Solaris
Disk /dev/sdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x99bab3b4
Device Boot Start End Blocks Id System
/dev/sdb1 2048 10487807 5242880 8e Linux LVM
②创建PV
[root@cen7 ~]# pvcreate /dev/sdb1
WARNING: dos signature detected on /dev/sdb1 at offset 510. Wipe it? [y/n]: y
Wiping dos signature on /dev/sdb1.
Physical volume "/dev/sdb1" successfully created.
③查看PV
[root@cen7 ~]# pvdisplay /dev/sdb1
"/dev/sdb1" is a new physical volume of "5.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 5.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID yxWtAD-9Pye-9hVt-H7sZ-h44x-3MyP-NpadQ8
④创建VG
[root@cen7 ~]# vgcreate vg01 /dev/sdb1
Volume group "vg01" successfully created
⑤查看VG
[root@cen7 ~]# vgdisplay
--- Volume group ---
VG Name vg01
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size <5.00 GiB
PE Size 4.00 MiB
Total PE 1279
Alloc PE / Size 0 / 0
Free PE / Size 1279 / <5.00 GiB
VG UUID fVnLdP-mVtf-e1HI-33pR-MOcS-PLs5-l6nDck
⑥创建LV
[root@cen7 ~]# lvcreate -n lv01 -L 4.996G vg01#空间大小=1279*4M/1024
Rounding up size to full physical extent <5.00 GiB
Logical volume "lv01" created.
或者
[root@cen7 ~]# lvcreate -n lv01 -l 1279 vg01
Logical volume "lv01" created.
⑦查看LV
[root@cen7 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vg01/lv01
LV Name lv01
VG Name vg01
LV UUID dq0d77-sVP2-F3CX-baQC-5fvy-MeTU-YE710s
LV Write Access read/write
LV Creation host, time cen7, 2022-02-22 10:12:04 +0800
LV Status available
# open 0
LV Size <5.00 GiB
Current LE 1279
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
⑧格式化文件系统
[root@cen7 ~]# mkfs.xfs /dev/vg01/lv01
meta-data=/dev/vg01/lv01 isize=512 agcount=4, agsize=327424 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=1309696, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 b
⑨挂载文件分区
[root@cen7 ~]# mkdir /mnt/lv01
[root@cen7 ~]# mount /dev/vg01/lv01 /mnt/lv01
⑩查看是否挂在成功
[root@cen7 ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 2.0G 0 2.0G 0% /dev
tmpfs tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs tmpfs 2.0G 13M 2.0G 1% /run
tmpfs tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sda2 xfs 198G 27G 172G 14% /
/dev/sda1 xfs 217M 147M 71M 68% /boot
tmpfs tmpfs 394M 4.0K 394M 1% /run/user/42
tmpfs tmpfs 394M 28K 394M 1% /run/user/0
/dev/sr0 iso9660 4.4G 4.4G 0 100% /run/media/root/CentOS 7 x86_64
/dev/mapper/vg01-lv01 xfs 5.0G 33M 5.0G 1% /mnt/lv01
⑧移除LV
[root@cen7 ~]# lvremove /dev/vg01/lv01
Do you really want to remove active logical volume vg01/lv01? [y/n]: y
Logical volume "lv01" successfully removed
