linux 配置LVM

大型LVM专题，请查看 烂泥行天下 https://www.cnblogs.com/ilanni/tag/LVM/

pvmove命令搬移PV中的资料(只限于同一VG中)。
用法
pvmove [-n ] []

实例
# pvmove /dev/hda5 /dev/hda6　　　#将VG中pv hda5的内容搬移到hda6中
# pvmove /dev/hda5　　　#也可以这样，lvm决定hda5的内容被复制到哪里

1. 阿里云挂载LVM目录(创建LVM,以及配置第一块硬盘）

fdisk /dev/vdb

输入

n

p

1

enter

enter

wq

pvcreate /dev/vdb1
vgcreate lvmgroup /dev/vdb1
vgchange -ay lvmgroup
lvcreate -l 100%FREE -n elasticsearch lvmgroup
fdisk -l
mkfs.ext4 /dev/mapper/lvmgroup-elasticsearch 
cd /
mkdir elasticsearch
mount /dev/mapper/lvmgroup-elasticsearch /elasticsearch/
df -h

把新建的LVM分区挂载到某个目录上，并且设置开机自动挂载

vi /etc/fstab

下面这段话放到fstab最下方

"/dev/mapper/lvmgroup-elasticsearch /elasticsearch ext4 defaults 0 0"

2. 在已有LVM分区上扩展新的硬盘

挂在新硬盘

fdisk -l
fdisk /dev/vdd

输入

n

p

1

回车

回车

t

8e

wq

partprobe
pvcreate /dev/vdd1
vgextend lvmgroup /dev/vdd1
lvextend -l +100%free /dev/mapper/lvmgroup-elasticsearch
resize2fs /dev/mapper/lvmgroup-elasticsearch

 partprobe有些时候需要跑，有些时候不需要，我还是不太了解

 3. 服务器卸载/home目录的庞大LVM空间给 /根目录

[root@localhost logs]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G  832M  7.0G  11% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   49G  1.8G  97% /
/dev/mapper/centos-home   42G   33M   42G   1% /home
/dev/sda1                497M  154M  344M  31% /boot
tmpfs                    1.6G     0  1.6G   0% /run/user/0
tmpfs                    1.6G     0  1.6G   0% /run/user/1000
You have mail in /var/spool/mail/root
[root@localhost logs]# umount /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed
You have mail in /var/spool/mail/root
[root@localhost logs]# lvextend -l +100%free /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 91.63 GiB (23458 extents).
  Logical volume centos/root successfully resized.
[root@localhost logs]# resize2fs /dev/mapper/centos-root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root
Couldn't find valid filesystem superblock.
[root@localhost logs]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               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 24020992
You have mail in /var/spool/mail/root
[root@localhost logs]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G  832M  7.0G  11% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/mapper/centos-root   92G   49G   44G  53% /
/dev/sda1                497M  154M  344M  31% /boot
tmpfs                    1.6G     0  1.6G   0% /run/user/0
tmpfs                    1.6G     0  1.6G   0% /run/user/1000

LVM扩容报错以及 xfs_growfs 和 resize2fs 区别请参考

https://www.cnblogs.com/faberbeta/p/13152477.html