linux 创建逻辑卷

创建分区

[root@localhost lohr]# fdisk /dev/sdb
欢迎使用 fdisk (util-linux 2.23.2)。

更改将停留在内存中，直到您决定将更改写入磁盘。
使用写入命令前请三思。

Device does not contain a recognized partition table
使用磁盘标识符 0xa7a34d5d 创建新的 DOS 磁盘标签。

命令(输入 m 获取帮助)：m
命令操作
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   g   create a new empty GPT partition table
   G   create an IRIX (SGI) partition table
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

命令(输入 m 获取帮助)：n   
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p  
分区号 (1-4，默认 1)：
起始 扇区 (2048-10485759，默认为 2048)：
将使用默认值 2048
Last 扇区, +扇区 or +size{K,M,G} (2048-10485759，默认为 10485759)：+5G
值超出范围。
Last 扇区, +扇区 or +size{K,M,G} (2048-10485759，默认为 10485759)：+4G
分区 1 已设置为 Linux 类型，大小设为 4 GiB

命令(输入 m 获取帮助)：T
已选择分区 1
Hex 代码(输入 L 列出所有代码)：L

 0  空              24  NEC DOS         81  Minix / 旧 Linu bf  Solaris        
 1  FAT12           27  隐藏的 NTFS Win 82  Linux 交换 / So c1  DRDOS/sec (FAT-
 2  XENIX root      39  Plan 9          83  Linux           c4  DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  84  OS/2 隐藏的 C:  c6  DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     85  Linux 扩展      c7  Syrinx         
 5  扩展            41  PPC PReP Boot   86  NTFS 卷集       da  非文件系统数据 
 6  FAT16           42  SFS             87  NTFS 卷集       db  CP/M / CTOS / .
 7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux 纯文本    de  Dell 工具      
 8  AIX             4e  QNX4.x 第2部分  8e  Linux LVM       df  BootIt         
 9  AIX 可启动      4f  QNX4.x 第3部分  93  Amoeba          e1  DOS 访问       
 a  OS/2 启动管理器 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/O        
 b  W95 FAT32       51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStor      
 c  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad 休 eb  BeOS fs        
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD         ee  GPT            
 f  W95 扩展 (LBA)  54  OnTrackDM6      a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC  
11  隐藏的 FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor      
12  Compaq 诊断     5c  Priam Edisk     a9  NetBSD          f4  SpeedStor      
14  隐藏的 FAT16 <3 61  SpeedStor       ab  Darwin 启动     f2  DOS 次要       
16  隐藏的 FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS    
17  隐藏的 HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE 
18  AST 智能睡眠    65  Novell Netware  b8  BSDI swap       fd  Linux raid 自动
1b  隐藏的 W95 FAT3 70  DiskSecure 多启 bb  Boot Wizard 隐  fe  LANstep        
1c  隐藏的 W95 FAT3 75  PC/IX           be  Solaris 启动    ff  BBT            
1e  隐藏的 W95 FAT1 80  旧 Minix       
Hex 代码(输入 L 列出所有代码)：8e
已将分区“Linux”的类型更改为“Linux LVM”

命令(输入 m 获取帮助)：w
The partition table has been altered!

Calling ioctl() to re-read partition table.
正在同步磁盘。

向内核注册分区

[root@localhost lohr]# partprobe /dev/sdb

创建物理卷

[root@localhost lohr]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.

创建卷组

[root@localhost lohr]# vgcreate thomas /dev/sdb
  Volume group "thomas" successfully created

创建逻辑卷

[root@localhost lohr]# lvcreate -n thomas-lv -L 1G thomas 
  Logical volume "thomas-lv" created.

创建文件系统

[root@localhost lohr]# mkfs.ext4 /dev/thomas/thomas-lv 
mke2fs 1.42.9 (28-Dec-2013)
文件系统标签=
OS type: Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
65536 inodes, 262144 blocks
13107 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376

Allocating group tables: 完成                            
正在写入inode表: 完成                            
Creating journal (8192 blocks): 完成
Writing superblocks and filesystem accounting information: 完成

挂载

[root@localhost lohr]# vi /etc/fstab 


#
# /etc/fstab
# Created by anaconda on Sun Jun  7 11:20:49 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
.host:/VMShare /mnt/hgfs fuse.vmhgfs-fuse allow_other,defaults 0 0
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=4cd669bd-4db1-49d9-afb6-245b36db7470 /boot                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0
/dev/thomas/lv-thomas /mnt/lv-thomas            ext4    defaults        0 0 #添加

mount -a

挂载成功

查看物理卷

[root@localhost lohr]# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/sdb
  VG Name               thomas
  PV Size               5.00 GiB / not usable 4.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              1279
  Free PE               1023
  Allocated PE          256
  PV UUID               pVLZ0a-1DmV-13SP-8Keq-GaW0-5gdP-PmosB2

查看卷组信息

[root@localhost lohr]# vgdisplay 
  --- Volume group ---
  VG Name               thomas
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  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       256 / 1.00 GiB
  Free  PE / Size       1023 / <4.00 GiB
  VG UUID               gSH0Zs-rC1U-D8PY-WaE1-nzGI-t3Jh-Xj8VXo

查看逻辑卷

[root@localhost lohr]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/thomas/thomas-lv
  LV Name                thomas-lv
  VG Name                thomas
  LV UUID                4enjau-4c83-tFX1-xvw5-vrMv-fsv3-S3xhNd
  LV Write Access        read/write
  LV Creation host, time localhost, 2020-08-09 10:06:52 -0400
  LV Status              available
  # open                 1
  LV Size                1.00 GiB
  Current LE             256
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2