LVM（Logical Volume Manager）
一. LVM概述
1. 什么是 LVM
LVM（Logical Volume Manager，逻辑卷管理器）是 Linux 系统下的一种 存储管理 机制，能够灵活地管理磁盘分区。它提供了一种比传统分区管理（如fdisk、parted）更高级的存储管理方式，允许动态调整存储空间，方便扩展和缩减分区，而不会影响已有数据。
2. LVM 主要概念
LVM 的核心概念类似于 RAID 或虚拟存储池，其主要组成部分如下：
-
PV（Physical Volume，物理卷）
-
LVM 的最底层单位，可以是整个硬盘，也可以是一个分区。
-
通过
pvcreate将物理磁盘或分区初始化为 LVM 可用的 PV。
-
-
VG（Volume Group，卷组）
- 由多个 PV 组成的存储池，所有的存储空间都可以在 VG 内部动态分配。
- 通过
vgcreate创建 VG。
-
LV（Logical Volume，逻辑卷）
- 相当于传统的“分区”，可以格式化文件系统（如
ext4、xfs），然后挂载使用。 - 通过
lvcreate创建 LV，大小可以随时扩展或缩小（前提是文件系统支持）。
- 相当于传统的“分区”，可以格式化文件系统（如
-
PE（Physical Extents，物理分块）
- LVM 内部的最小存储单元，默认大小 4MB（可调整）。
- VG 内的空间被划分成若干个 PE，LV 的大小由 PE 数量决定。
┌───────────────────────────────┐ │ 物理磁盘（sdb, sdc） │ │ (未初始化) │ └───────────────────────────────┘ ↓ pvcreate ┌───────────────────────────────┐ │ 物理卷（PV） │ │ /dev/sdb /dev/sdc │ └───────────────────────────────┘ ↓ vgcreate ┌───────────────────────────────┐ │ 卷组（VG） │ │ my_vg = PV1 + PV2 │ │ (存储池) │ └───────────────────────────────┘ ↓ lvcreate ┌───────────────────────────────┐ │ 逻辑卷（LV） │ │ /dev/my_vg/my_lv (50G) │ │ (类似于分区，可格式化挂载) │ └───────────────────────────────┘
3. LVM 的优势
- 动态扩展与缩减存储：可在不停机的情况下扩展 LV 或 VG，而无需重新分区。
- 跨多块磁盘管理：可以将多块磁盘合并为一个存储池（VG），提高存储利用率。
- 快照（Snapshot）：支持创建数据快照，方便数据备份与恢复。
- 条带化存储（Striping）：类似 RAID 0，提高磁盘 I/O 性能。
4. LVM 基本操作
# 1. 创建物理卷
pvcreate /dev/sdb /dev/sdc
# 2. 创建卷组
vgcreate my_vg /dev/sdb /dev/sdc
# 3. 创建逻辑卷（比如创建 10GB 的逻辑卷）
lvcreate -L 10G -n my_lv my_vg
# 4. 格式化并挂载
mkfs.ext4 /dev/my_vg/my_lv
mkdir /mnt/lvm_mount
mount /dev/my_vg/my_lv /mnt/lvm_mount
# 5. 扩展逻辑卷
lvextend -L +5G /dev/my_vg/my_lv # 增加 5GB
resize2fs /dev/my_vg/my_lv # 扩展文件系统（ext4）
二. LVM 实战操作
1. 环境准备
2. 对磁盘分区
2.1 使用 fdisk 对 /dev/sdc 进行分区
# 1.进入 fdisk 交互模式
[root@lvm:~]# fdisk /dev/sdc
Welcome to fdisk (util-linux 2.37.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x0313bb2e.
# 2.查看磁盘信息
Command (m for help): p
Disk /dev/sdc: 300 GiB, 322122547200 bytes, 629145600 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0313bb2e
# 发现磁盘 /dev/sdc 没有有效的分区表，默认是 dos 分区表。
# 3.创建 GPT 分区表
Command (m for help): g
Created a new GPT disklabel (GUID: F96B7C68-81FB-D14C-A17D-C686B732B937).
# 4.创建第一个 100G 分区
Command (m for help): n
Partition number (1-128, default 1): # 分区编号（默认 1）
First sector (2048-629145566, default 2048): # 起始扇区（默认 2048）
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-629145566, default 629145566): +100G
Created a new partition 1 of type 'Linux filesystem' and of size 100 GiB.
# 成功创建 /dev/sdc1 分区，大小 100G
# 5.创建第二个 200G 分区
Command (m for help): n
Partition number (2-128, default 2): # 分区编号（默认 2）
First sector (209717248-629145566, default 209717248): # 起始扇区（默认 209717248）
Last sector, +/-sectors or +/-size{K,M,G,T,P} (209717248-629145566, default 629145566):
Created a new partition 2 of type 'Linux filesystem' and of size 200 GiB.
# 成功创建 /dev/sdc2 分区，大小 200G
# 6.查看分区情况
Command (m for help): p
Disk /dev/sdc: 300 GiB, 322122547200 bytes, 629145600 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: F96B7C68-81FB-D14C-A17D-C686B732B937
Device Start End Sectors Size Type
/dev/sdc1 2048 209717247 209715200 100G Linux filesystem
/dev/sdc2 209717248 629145566 419428319 200G Linux filesystem
# 7.保存分区表并退出
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
# 8.验证分区是否生效
[root@lvm:~]# fdisk -l /dev/sdc
Disk /dev/sdc: 300 GiB, 322122547200 bytes, 629145600 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: F96B7C68-81FB-D14C-A17D-C686B732B937
Device Start End Sectors Size Type
/dev/sdc1 2048 209717247 209715200 100G Linux filesystem
/dev/sdc2 209717248 629145566 419428319 200G Linux filesystem
2.2 对/dev/sde进行分区
[root@lvm:~]# fdisk -l /dev/sde
Disk /dev/sde: 1 TiB, 1099511627776 bytes, 2147483648 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@lvm:~]# fdisk /dev/sde
Welcome to fdisk (util-linux 2.37.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0xf8cc9c96.
Command (m for help): p
Disk /dev/sde: 1 TiB, 1099511627776 bytes, 2147483648 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xf8cc9c96
Command (m for help): g
Created a new GPT disklabel (GUID: 7B0A9C2B-F3B1-3A42-9665-8640DFC613DC).
Command (m for help): n
Partition number (1-128, default 1):
First sector (2048-2147483614, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-2147483614, default 2147483614): +500G
Created a new partition 1 of type 'Linux filesystem' and of size 500 GiB.
Command (m for help): n
Partition number (2-128, default 2):
First sector (1048578048-2147483614, default 1048578048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (1048578048-2147483614, default 2147483614):
Created a new partition 2 of type 'Linux filesystem' and of size 524 GiB.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
[root@lvm:~]# fdisk -l /dev/sde
Disk /dev/sde: 1 TiB, 1099511627776 bytes, 2147483648 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 7B0A9C2B-F3B1-3A42-9665-8640DFC613DC
Device Start End Sectors Size Type
/dev/sde1 2048 1048578047 1048576000 500G Linux filesystem
/dev/sde2 1048578048 2147483614 1098905567 524G Linux filesystem
2.3 检查磁盘分区情况
3. 创建pv
3.1 查看现有的pv列表
[root@lvm:~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 ubuntu-vg lvm2 a-- <48.00g 0
3.2 创建pv
[root@lvm:~]# pvcreate /dev/sdb /dev/sdc{1,2} /dev/sdd /dev/sde{1,2}
Physical volume "/dev/sdb" successfully created.
Physical volume "/dev/sdc1" successfully created.
Physical volume "/dev/sdc2" successfully created.
Physical volume "/dev/sdd" successfully created.
Physical volume "/dev/sde1" successfully created.
Physical volume "/dev/sde2" successfully created.
3.3 再次查看现有的pv列表
[root@lvm:~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 ubuntu-vg lvm2 a-- <48.00g 0
/dev/sdb lvm2 --- 100.00g 100.00g
/dev/sdc1 lvm2 --- 100.00g 100.00g
/dev/sdc2 lvm2 --- <200.00g <200.00g
/dev/sdd lvm2 --- 500.00g 500.00g
/dev/sde1 lvm2 --- 500.00g 500.00g
/dev/sde2 lvm2 --- <524.00g <524.00g
4. 创建vg
4.1 查看现有的vg列表
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
4.2 创建vg
[root@lvm:~]# vgcreate vg01 /dev/sdb /dev/sdc1 /dev/sdc2
Volume group "vg01" successfully created
[root@lvm:~]# vgcreate vg02 /dev/sdd /dev/sde1 /dev/sde2
Volume group "vg02" successfully created
4.3 再次查看现有的vg列表
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 0 0 wz--n- <399.99g <399.99g
vg02 3 0 0 wz--n- <1.49t <1.49t
5. 创建lv
5.1 查看现有的lv列表
[root@lvm:~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
ubuntu-lv ubuntu-vg -wi-ao---- <48.00g
5.2 创建lv
[root@lvm:~]# lvcreate vg01 --name lv01 --size 50G
Logical volume "lv01" created.
[root@lvm:~]# lvcreate vg01 --name lv02 --size 100G
Logical volume "lv02" created.
[root@lvm:~]# lvcreate vg02 --name lv03 --size 20G
Logical volume "lv03" created.
[root@lvm:~]# lvcreate vg02 --name lv04 --size 50G
Logical volume "lv04" created.
5.3 再次查看现有的lv列表
[root@lvm:~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 ubuntu-vg lvm2 a-- <48.00g 0
/dev/sdb vg01 lvm2 a-- <100.00g <50.00g
/dev/sdc1 vg01 lvm2 a-- <100.00g <100.00g
/dev/sdc2 vg01 lvm2 a-- <200.00g <100.00g
/dev/sdd vg02 lvm2 a-- <500.00g <430.00g
/dev/sde1 vg02 lvm2 a-- <500.00g <500.00g
/dev/sde2 vg02 lvm2 a-- <524.00g <524.00g
[root@lvm:~]#
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <249.99g
vg02 3 2 0 wz--n- <1.49t <1.42t
[root@lvm:~]#
[root@lvm:~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
ubuntu-lv ubuntu-vg -wi-ao---- <48.00g
lv01 vg01 -wi-a----- 50.00g
lv02 vg01 -wi-a----- 100.00g
lv03 vg02 -wi-a----- 20.00g
lv04 vg02 -wi-a----- 50.00g
6. 格式化lv设备
6.1 查看lv的设备存储路径
[root@lvm:~]# ll /dev/vg01
total 0
drwxr-xr-x 2 root root 80 Feb 25 16:25 ./
drwxr-xr-x 22 root root 4460 Feb 25 16:26 ../
lrwxrwxrwx 1 root root 7 Feb 25 16:25 lv01 -> ../dm-1
lrwxrwxrwx 1 root root 7 Feb 25 16:25 lv02 -> ../dm-2
[root@lvm:~]# ll /dev/vg02
total 0
drwxr-xr-x 2 root root 80 Feb 25 16:26 ./
drwxr-xr-x 22 root root 4460 Feb 25 16:26 ../
lrwxrwxrwx 1 root root 7 Feb 25 16:25 lv03 -> ../dm-3
lrwxrwxrwx 1 root root 7 Feb 25 16:26 lv04 -> ../dm-4
[root@lvm:~]# ll /dev/mapper/
total 0
drwxr-xr-x 2 root root 160 Feb 25 16:26 ./
drwxr-xr-x 22 root root 4460 Feb 25 16:26 ../
crw------- 1 root root 10, 236 Feb 25 16:02 control
lrwxrwxrwx 1 root root 7 Feb 25 16:02 ubuntu--vg-ubuntu--lv -> ../dm-0
lrwxrwxrwx 1 root root 7 Feb 25 16:25 vg01-lv01 -> ../dm-1
lrwxrwxrwx 1 root root 7 Feb 25 16:25 vg01-lv02 -> ../dm-2
lrwxrwxrwx 1 root root 7 Feb 25 16:25 vg02-lv03 -> ../dm-3
lrwxrwxrwx 1 root root 7 Feb 25 16:26 vg02-lv04 -> ../dm-4
6.2 格式化lv设备
# 1.格式化为ext4文件系统
[root@lvm:~]# mkfs.ext4 /dev/vg01/lv01
mke2fs 1.46.5 (30-Dec-2021)
Creating filesystem with 13107200 4k blocks and 3276800 inodes
Filesystem UUID: e8267825-be6f-4b78-ac78-3a1ddcef678d
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Allocating group tables: done
Writing inode tables: done
Creating journal (65536 blocks): done
Writing superblocks and filesystem accounting information: done
# 2.格式化为ntfs文件系统（速度较慢）
[root@lvm:~]# mkfs.ntfs /dev/vg01/lv02
Cluster size has been automatically set to 4096 bytes.
Initializing device with zeroes: 100% - Done.
Creating NTFS volume structures.
mkntfs completed successfully. Have a nice day.
# 3.格式化为fat件系统
[root@lvm:~]# mkfs.fat /dev/vg02/lv03
mkfs.fat 4.2 (2021-01-31)
# 4.格式化为xfs文件系统
[root@lvm:~]# mkfs.xfs /dev/vg02/lv04
meta-data=/dev/vg02/lv04 isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=0 inobtcount=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
7. 挂载lv设备
7.1 创建挂载点
[root@lvm:~]# mkdir -p /caixiangjia/{ext4,ntfs,fat,xfs}
[root@lvm:~]# ll /caixiangjia/
total 16
drwxr-xr-x 2 root root 4096 Feb 25 16:44 ext4/
drwxr-xr-x 2 root root 4096 Feb 25 16:44 fat/
drwxr-xr-x 2 root root 4096 Feb 25 16:44 ntfs/
drwxr-xr-x 2 root root 4096 Feb 25 16:44 xfs/
7.2 挂载lv设备
[root@lvm:~]# mount /dev/vg01/lv01 /caixiangjia/ext4/
[root@lvm:~]# mount /dev/vg01/lv02 /caixiangjia/ntfs/
[root@lvm:~]# mount /dev/vg02/lv03 /caixiangjia/fat/
[root@lvm:~]# mount /dev/vg02/lv04 /caixiangjia/xfs/
7.3 查看lv设备挂载信息
[root@lvm:~]# mount | grep caixiangjia
/dev/mapper/vg01-lv01 on /caixiangjia/ext4 type ext4 (rw,relatime)
/dev/mapper/vg01-lv02 on /caixiangjia/ntfs type fuseblk (rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
/dev/mapper/vg02-lv03 on /caixiangjia/fat type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/mapper/vg02-lv04 on /caixiangjia/xfs type xfs (rw,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota)
[root@lvm:~]# df -h | grep caixiangjia
/dev/mapper/vg01-lv01 49G 24K 47G 1% /caixiangjia/ext4
/dev/mapper/vg01-lv02 100G 68M 100G 1% /caixiangjia/ntfs
/dev/mapper/vg02-lv03 20G 16K 20G 1% /caixiangjia/fat
/dev/mapper/vg02-lv04 50G 390M 50G 1% /caixiangjia/xfs
三. LVM扩展案例
1. 扩展lv案例
1.1 扩容到指定大小ext4案例
# 1.扩容前查看
[root@lvm:~]# df -h | grep caixiangjia
/dev/mapper/vg01-lv01 49G 24K 47G 1% /caixiangjia/ext4
/dev/mapper/vg01-lv02 100G 68M 100G 1% /caixiangjia/ntfs
/dev/mapper/vg02-lv03 20G 16K 20G 1% /caixiangjia/fat
/dev/mapper/vg02-lv04 50G 390M 50G 1% /caixiangjia/xfs
[root@lvm:~]# fdisk -l /dev/mapper/vg01-lv01
Disk /dev/mapper/vg01-lv01: 50 GiB, 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
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <249.99g
vg02 3 2 0 wz--n- <1.49t <1.42t
# 2.开始扩容
[root@lvm:~]# lvextend /dev/mapper/vg01-lv01 --size 150G
Size of logical volume vg01/lv01 changed from 50.00 GiB (12800 extents) to 150.00 GiB (38400 extents).
Logical volume vg01/lv01 successfully resized.
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <149.99g
vg02 3 2 0 wz--n- <1.49t <1.42t
[root@lvm:~]# df -h | grep caixiangjia
/dev/mapper/vg01-lv01 49G 24K 47G 1% /caixiangjia/ext4
/dev/mapper/vg01-lv02 100G 68M 100G 1% /caixiangjia/ntfs
/dev/mapper/vg02-lv03 20G 16K 20G 1% /caixiangjia/fat
/dev/mapper/vg02-lv04 50G 390M 50G 1% /caixiangjia/xfs
[root@lvm:~]# fdisk -l /dev/mapper/vg01-lv01
Disk /dev/mapper/vg01-lv01: 150 GiB, 161061273600 bytes, 314572800 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
3.使用 resize2fs 工具刷新最新的挂载表
[root@lvm:~]# resize2fs /dev/mapper/vg01-lv01
resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/mapper/vg01-lv01 is mounted on /caixiangjia/ext4; on-line resizing required
old_desc_blocks = 7, new_desc_blocks = 19
The filesystem on /dev/mapper/vg01-lv01 is now 39321600 (4k) blocks long.
[root@lvm:~]# df -h | grep caixiangjia
/dev/mapper/vg01-lv01 148G 24K 141G 1% /caixiangjia/ext4
/dev/mapper/vg01-lv02 100G 68M 100G 1% /caixiangjia/ntfs
/dev/mapper/vg02-lv03 20G 16K 20G 1% /caixiangjia/fat
/dev/mapper/vg02-lv04 50G 390M 50G 1% /caixiangjia/xfs
1.2 剩余空间全部扩容xfs案例
# 1.扩容前查看
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <149.99g
vg02 3 2 0 wz--n- <1.49t <1.42t
[root@lvm:~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
ubuntu-lv ubuntu-vg -wi-ao---- <48.00g
lv01 vg01 -wi-ao---- 150.00g
lv02 vg01 -wi-ao---- 100.00g
lv03 vg02 -wi-ao---- 20.00g
lv04 vg02 -wi-ao---- 50.00g
# 2.将vg剩余的所有空间扩容到指定的lv
[root@lvm:~]# lvextend /dev/mapper/vg02-lv04 -l +100%FREE
Size of logical volume vg02/lv04 changed from 50.00 GiB (12800 extents) to <1.47 TiB (385021 extents).
Logical volume vg02/lv04 successfully resized.
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <149.99g
vg02 3 2 0 wz--n- <1.49t 0 # 此时不难发现，vg的空间已经完全用完了
[root@lvm:~]# fdisk -l /dev/mapper/vg02-lv04
Disk /dev/mapper/vg02-lv04: 1.47 TiB, 1614895120384 bytes, 3154092032 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
# 3.自动扩展XFS文件系统到最大的可用大小
[root@lvm:~]# df -h | grep caixiangjia
/dev/mapper/vg01-lv01 148G 24K 141G 1% /caixiangjia/ext4
/dev/mapper/vg01-lv02 100G 68M 100G 1% /caixiangjia/ntfs
/dev/mapper/vg02-lv03 20G 16K 20G 1% /caixiangjia/fat
/dev/mapper/vg02-lv04 50G 390M 50G 1% /caixiangjia/xfs
[root@lvm:~]# xfs_growfs /caixiangjia/xfs/
meta-data=/dev/mapper/vg02-lv04 isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=0 inobtcount=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 394261504
[root@lvm:~]# df -h | grep caixiangjia
/dev/mapper/vg01-lv01 148G 24K 141G 1% /caixiangjia/ext4
/dev/mapper/vg01-lv02 100G 68M 100G 1% /caixiangjia/ntfs
/dev/mapper/vg02-lv03 20G 16K 20G 1% /caixiangjia/fat
/dev/mapper/vg02-lv04 1.5T 11G 1.5T 1% /caixiangjia/xfs
2. 扩展vg案例
2.1 环境准备
2.2 扩容vg案例
# 1.查看现有的vg列表
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <149.99g
vg02 3 2 0 wz--n- <1.49t 0
# 2.创建pv
[root@lvm:~]# pvcreate /dev/sdf /dev/sdg
Physical volume "/dev/sdf" successfully created.
Physical volume "/dev/sdg" successfully created.
# 3.将pv加入到vg02中
[root@lvm:~]# vgextend vg02 /dev/sdf /dev/sdg
Volume group "vg02" successfully extended
# 4.再次查看现有的vg列表
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 2 0 wz--n- <399.99g <149.99g
vg02 5 2 0 wz--n- <3.49t <2.00t
3. 移除现有的vg
3.1 卸载设备
[root@lvm:~]# umount /dev/caixiangjia/ext4/
[root@lvm:~]# umount /dev/caixiangjia/ntfs/
[root@lvm:~]# umount /dev/caixiangjia/fat/
[root@lvm:~]# umount /dev/caixiangjia/xfs/
[root@lvm:~]# df -h | grep caixiangjia
[root@lvm:~]#
3.2 移除vg列表等待所有lv
[root@lvm:~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
ubuntu-lv ubuntu-vg -wi-ao---- <48.00g
lv01 vg01 -wi-a----- 150.00g
lv02 vg01 -wi-a----- 100.00g
lv03 vg02 -wi-a----- 20.00g
lv04 vg02 -wi-a----- <1.47t
[root@lvm:~]# lvremove vg01 --force
Logical volume "lv01" successfully removed
Logical volume "lv02" successfully removed
[root@lvm:~]# lvremove vg02 --force
Logical volume "lv03" successfully removed
Logical volume "lv04" successfully removed
[root@lvm:~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
ubuntu-lv ubuntu-vg -wi-ao---- <48.00g
3.3 移除所有的vg
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
vg01 3 0 0 wz--n- <399.99g <399.99g
vg02 5 0 0 wz--n- <3.49t <3.49t
[root@lvm:~]# vgremove vg01
Volume group "vg01" successfully removed
[root@lvm:~]# vgremove vg02
Volume group "vg02" successfully removed
[root@lvm:~]# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <48.00g 0
分类:
Linux基础
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