LVM管理_ 字节宝

# lvm工作原理

LVM是在磁盘分区和文件系统之间添加的一个逻辑层，来为文件系统屏蔽下层磁盘分区布局，提供一个抽象的盘卷，在盘卷上建立文件系统。管理员利用LVM可以在磁盘不用重新分区的情况下动态调整文件系统的大小，并且利用LVM管理的文件系统可以跨越磁盘，当服务器添加了新的磁盘后，管理员不必将原有的文件移动到新的磁盘上，而是通过LVM可以直接扩展文件系统跨越磁盘

它就是通过将底层的物理硬盘封装起来，然后以逻辑卷的方式呈现给上层应用。在LVM中，其通过对底层的硬盘进行封装，当我们对底层的物理硬盘进行操作时，其不再是针对于分区进行操作，而是通过一个叫做逻辑卷的东西来对其进行底层的磁盘管理操作。

逻辑卷管理的核心在于如何处理我们系统中安装的硬盘及其分区，对于我们的逻辑卷管理器来说，把硬盘当作物理卷来看

# LVM常用的术语

先来了解一下常用的名词解释

物理存储介质（The physical media）

这里指系统的存储设备文件，可是磁盘分区，整个磁盘，RAID阵列或SAN磁盘，设备必须初始化为LVM物理卷，才能与LVM结合使用

物理卷PV（physical volume）

物理卷就是指硬盘分区或从逻辑上与磁盘分区具有同样功能的设备(如RAID)，是LVM的基本存储逻辑块，但和基本的物理存储介质（如分区、磁盘等）比较，却包含有与LVM相关的管理参数（注册物理设备以便在卷组中使用）,创建物理卷它可以用硬盘分区，也可以用硬盘本身；

卷组VG（Volume Group）

LVM卷组类似于非LVM系统中的物理硬盘，一个LVM卷组由一个或多个物理卷组成 

逻辑卷LV（logical volume）

类似于非LVM系统中的硬盘分区，LV建立在VG之上，可以在LV之上建立文件系统

PE（physical extents）

PV中可以分配的最少存储单元，PE的大小是可以指定的，默认为4MB

LE（logical extent）

LV中可以分配的最少存储单元，在同一个卷组中，LE的大小和PE是相同的，并且一一对应

# LVM优点

使用卷组，使多个硬盘空间看起来像是一个大的硬盘
使用逻辑卷，可以跨多个硬盘空间的分区 sdb1 sdb2 sdc1 sdd2 sdf
在使用逻辑卷时，它可以在空间不足时动态调整它的大小
在调整逻辑卷大小时，不需要考虑逻辑卷在硬盘上的位置，不用担心没有可用的连续空间
可以在线对LV,VG 进行创建，删除，调整大小等操作。LVM上的文件系统也需要重新调整大小。
可以将正在使用中的硬盘迁移到别的硬盘上(emc--500G DELL---1.2T)
允许创建快照，可以用来保存文件系统的备份。只能使用一次

解释： LVM是软件的卷管理方式，而RAID是磁盘保护的方法。对于重要的业务来说，一般是同时存在。RAID用来保护物理的磁盘不会因为故障而中断业务。LVM用来实现对卷的良性的管理，更好的利用磁盘资源

# 创建LVM的基本步骤

先做物理卷 pvcreate /dev/sdb1
把不同的物理卷加入到卷组当中 vgcreate datavg /dev/sdb1
创建逻辑卷 lvcreate
格式化文件系统 mkfs.xfs
创建挂载点并进行挂载 mount

lvcreate -l 100%FREE 指定全部大小

对ext类型文件系统扩容： resize2fs

对xfs类型文件系统扩容： xfs_growfs

resize2fs和xfs_growfs 两者的区别是传递的参数不一样的，xfs_growfs是采用的挂载点；resize2fs是逻辑卷名称，而且resize2fs命令不能对xfs类型文件系统使用

# LVM删除

创建: pvcreate ---> vgcreate ---> lvcrdeate ---> mkfs.xfs lv ----> mount

删除： umount ----> lvremove lv -----> vgremove vg -----> pvremove

# 底层存储更换新建PV pvcreate /dev/sdc1

扩容VG vgextend datavg /dev/sdc1

移动数据 pvmove /dev/sdb5 /dev/sdc1

VG缩小 vgreduce datavg /dev/sdb5

删除小盘 pvremove /dev/sdb5

# 扩容操作

代码语言：javascript复制

1.fdisk /dev/vdc    //给新加的硬盘设备/dev/vdc创建分区(注意设备名称略有差异，步骤同下)
2.分别按n、p、1、t、8e、wr
3.pvcreate /dev/vdc1
4.vgextend vg0 /dev/vdd1
5.lvextend -l  100%FREE /dev/vg0/lv0
6. xfs_growfs  /dev/vg0/lv0

# 大于2T的扩容使用

代码语言：javascript复制

1. 使用parted方式格式化磁盘
1.1 查看磁盘情况
[root@jylhlog2 ~]# fdisk -l
Disk /dev/sdd: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 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 /dev/sdc: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sde: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sdf: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 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: 0x0008ce60
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 1048567807 523234304 8e Linux LVM
Disk /dev/mapper/vg_root-lv_root: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-lv_swap: 68.7 GB, 68719476736 bytes, 134217728 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 /dev/mapper/vg_root-lv_data: 209.4 GB, 209371267072 bytes, 408928256 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 /dev/mapper/vg_root-lv_home: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-oracle: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-lv_grid: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/sdg: 2199.0 GB, 2199023255552 bytes, 4294967296 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@jylhlog2 ~]#
1.2 使用parted格式化/dev/sdg分区
[root@jylhlog2 ~]# parted /dev/sdg
GNU Parted 3.1
Using /dev/sdg
Welcome to GNU Parted! Type ‘help’ to view a list of commands.
(parted) mklabel gpt ------将MBR分区形式转为GPT分区形式
(parted) mkpart primary xfs 0 -1 ------设置分区的开始位置和结束位置
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? Ignore
(parted) print ------查看分区
Model: VMware Virtual disk (scsi)
Disk /dev/sdg: 2199GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 17.4kB 2199GB 2199GB primary
(parted) toggle 1 lvm ------使用toggle 更改硬盘类型
(parted) print ------查看分区
Model: VMware Virtual disk (scsi)
Disk /dev/sdg: 2199GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 17.4kB 2199GB 2199GB primary lvm
(parted) quit
Information: You may need to update /etc/fstab.
[root@jylhlog2 ~]#
1.3 查看格式化后的分区情况
[root@jylhlog2 ~]# fdisk -l
Disk /dev/sdd: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 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 /dev/sdc: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sde: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sdf: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 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: 0x0008ce60
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 1048567807 523234304 8e Linux LVM
Disk /dev/mapper/vg_root-lv_root: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-lv_swap: 68.7 GB, 68719476736 bytes, 134217728 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 /dev/mapper/vg_root-lv_data: 209.4 GB, 209371267072 bytes, 408928256 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 /dev/mapper/vg_root-lv_home: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-oracle: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-lv_grid: 64.4 GB, 64424509440 bytes, 125829120 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
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sdg: 2199.0 GB, 2199023255552 bytes, 4294967296 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: gpt
Disk identifier: 9C5E039C-2C6C-4585-8EAB-7B2DBA949516
# Start End Size Type Name
1 34 4294965343 2T Linux LVM primary
[root@jylhlog2 ~]#
1.4 使系统重读分区表
[root@jylhlog2 ~]# partprobe
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.
[root@jylhlog2 ~]#
[root@jylhlog2 ~]# fdisk -l
Disk /dev/sdd: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 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 /dev/sdc: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sde: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sdf: 2199.0 GB, 2199023255552 bytes, 4294967296 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 /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 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: 0x0008ce60
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 1048567807 523234304 8e Linux LVM
Disk /dev/mapper/vg_root-lv_root: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-lv_swap: 68.7 GB, 68719476736 bytes, 134217728 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 /dev/mapper/vg_root-lv_data: 209.4 GB, 209371267072 bytes, 408928256 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 /dev/mapper/vg_root-lv_home: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-oracle: 64.4 GB, 64424509440 bytes, 125829120 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 /dev/mapper/vg_root-lv_grid: 64.4 GB, 64424509440 bytes, 125829120 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
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sdg: 2199.0 GB, 2199023255552 bytes, 4294967296 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: gpt
Disk identifier: 9C5E039C-2C6C-4585-8EAB-7B2DBA949516
# Start End Size Type Name
1 34 4294965343 2T Linux LVM primary
[root@jylhlog2 ~]#
2. 创建pv、扩容vg、扩容lv、扩容xfs分区
2.1 查看目前分区情况
[root@jylhlog2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_root 60G 6.2G 54G 11% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 640M 63G 1% /dev/shm
tmpfs 63G 32M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 1014M 179M 836M 18% /boot
/dev/mapper/vg_root-lv_grid 60G 40G 21G 66% /grid
/dev/mapper/vg_root-lv_data 195G 595M 195G 1% /data
/dev/mapper/vg_root-oracle 60G 22G 38G 37% /oracle
/dev/mapper/vg_root-lv_home 60G 16G 45G 27% /home
tmpfs 13G 12K 13G 1% /run/user/42
tmpfs 13G 0 13G 0% /run/user/1000
[root@jylhlog2 ~]#
2.2 查看目前lv情况
[root@jylhlog2 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_data vg_root -wi-ao---- 194.99g
lv_grid vg_root -wi-ao---- 60.00g
lv_home vg_root -wi-ao---- 60.00g
lv_root vg_root -wi-ao---- 60.00g
lv_swap vg_root -wi-ao---- 64.00g
oracle vg_root -wi-ao---- 60.00g
[root@jylhlog2 ~]#
2.3 查看目前vg情况
[root@jylhlog2 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_root 1 6 0 wz–n- 498.99g 0
[root@jylhlog2 ~]#
2.4 创建pv
[root@jylhlog2 ~]# pvcreate /dev/sdg1
Physical volume “/dev/sdg1” successfully created.
[root@jylhlog2 ~]#
2.5 扩容vg
[root@jylhlog2 ~]# vgextend vg_root /dev/sdg1
Volume group “vg_root” successfully extended
[root@jylhlog2 ~]#
2.6 查看vg扩容情况
[root@jylhlog2 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_root 2 6 0 wz–n- <2.49t <2.00t
[root@jylhlog2 ~]#
2.7 查看扩容后vg大小情况
[root@jylhlog2 ~]# vgdisplay
— Volume group —
VG Name vg_root
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 6
Open LV 6
Max PV 0
Cur PV 2
Act PV 2
VG Size <2.49 TiB
PE Size 4.00 MiB
Total PE 652029
Alloc PE / Size 127742 / 498.99 GiB
Free PE / Size 524287 / <2.00 TiB
VG UUID bV0qQR-Vhfg-ynTF-dbza-qJD1-ao3k-l02WiP
[root@jylhlog2 ~]#
2.8 扩容lv
[root@jylhlog2 ~]# lvextend -L  2097148M /dev/mapper/vg_root-lv_data
Size of logical volume vg_root/lv_data changed from 194.99 GiB (49918 extents) to 2.19 TiB (574205 extents).
Logical volume vg_root/lv_data successfully resized.
[root@jylhlog2 ~]#
2.9 查看容量变化，发现文件系统大小没有变化
[root@jylhlog2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_root 60G 6.2G 54G 11% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 640M 63G 1% /dev/shm
tmpfs 63G 32M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 1014M 179M 836M 18% /boot
/dev/mapper/vg_root-lv_grid 60G 40G 21G 66% /grid
/dev/mapper/vg_root-lv_data 195G 595M 195G 1% /data
/dev/mapper/vg_root-oracle 60G 22G 38G 37% /oracle
/dev/mapper/vg_root-lv_home 60G 16G 45G 27% /home
tmpfs 13G 12K 13G 1% /run/user/42
tmpfs 13G 0 13G 0% /run/user/1000
[root@jylhlog2 ~]#
2.10 使用xfs_growfs同步磁盘信息
[root@jylhlog2 ~]# xfs_growfs /dev/mapper/vg_root-lv_data
meta-data=/dev/mapper/vg_root-lv_data isize=512 agcount=4, agsize=12779008 blks
 = sectsz=512 attr=2, projid32bit=1
 = crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=51116032, imaxpct=25
 = sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=24959, version=2
 = sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 51116032 to 587985920
[root@jylhlog2 ~]#
2.11 查看容量变化，发现文件系统已扩容成功
[root@jylhlog2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_root 60G 6.2G 54G 11% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 640M 63G 1% /dev/shm
tmpfs 63G 32M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 1014M 179M 836M 18% /boot
/dev/mapper/vg_root-lv_grid 60G 40G 21G 66% /grid
/dev/mapper/vg_root-lv_data 2.2T 597M 2.2T 1% /data
/dev/mapper/vg_root-oracle 60G 22G 38G 37% /oracle
/dev/mapper/vg_root-lv_home 60G 16G 45G 27% /home
tmpfs 13G 12K 13G 1% /run/user/42
tmpfs 13G 0 13G 0% /run/user/1000
[root@jylhlog2 ~]#

如果sdb1是一个磁盘阵列，而这个磁盘阵列使用年代太久，我们必须移出怎么办？移动数据： [root@test1 ~]# pvmove /dev/sdb1 /dev/sdb3 #将sdb1上数据移到新增加sdb3 pv 上 /dev/sdb1: Moved: 23.53% /dev/sdb1: Moved: 76.47% /dev/sdb1: Moved: 100.00% [root@test1 ~]# vgreduce vg01 /dev/sdb1 #移完数据再移出 Removed "/dev/sdb1" from volume group "vg01" [root@test1 ~]# pvs PV VG Fmt Attr PSize PFree /dev/sdb1 lvm2 --- 1.00g 1.00g /dev/sdb2 vg02 lvm2 a-- 1008.00m 1008.00m /dev/sdb3 vg01 lvm2 a-- 1020.00m 952.00m #vg01中只有sdb3了

root size 磁盘管理文件系统

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