vm动态（不关机）添加硬盘
准备
新添加的硬盘
关键命令记录
#读取新磁盘 host2是第2块盘 host3是第3块盘 以此类推
echo "- - -" > /sys/class/scsi_host/host2/scan
#命令执行完毕后，可以通过fdisk -l 查看
fdisk -l
#对添加的盘分区 n--p--回车--回车--w
fdisk /dev/sdb
#创建PV
pvcreate /dev/sdb1
#扩展VG vgextend 可以tab一下
vgextend cl /dev/sdb1
#扩展LV lvextend 可以tab一下
lvextend -L +100G /dev/cl/root
#扩展FS，在执行前要观察下 df -hT 的数据文件格式（我的/dev/mapper/cl-root是xfs 所以用xfs_growfs扩容）
# 是 ext3,、ext4、xfs， 文件格式不同，扩展命令是有差异的
# resize2fs -p /dev/mapper/vgoradata-lvoradata01
xfs_growfs /dev/mapper/cl-root
#检查 /etc/fstab 是否自动挂载
命令执行记录
[root@localhost ~]# fdisk -l
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: 0x00064a33
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 167772159 82836480 8e Linux LVM
Disk /dev/mapper/cl-root: 51.3 GB, 51308920832 bytes, 100212736 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/cl-swap: 8455 MB, 8455716864 bytes, 16515072 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/cl-home: 25.1 GB, 25052577792 bytes, 48930816 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@localhost ~]# echo "- - -" > /sys/class/scsi_host/host2/scan
[root@localhost ~]# fdisk -l
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: 0x00064a33
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 167772159 82836480 8e Linux LVM
Disk /dev/mapper/cl-root: 51.3 GB, 51308920832 bytes, 100212736 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/cl-swap: 8455 MB, 8455716864 bytes, 16515072 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/cl-home: 25.1 GB, 25052577792 bytes, 48930816 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: 107.4 GB, 107374182400 bytes, 209715200 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@localhost ~]#
[root@localhost ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
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
Building a new DOS disklabel with disk identifier 0xc75e3e5b.
Command (m for help):
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]#
[root@localhost ~]# vgextend cl /dev/sdb1
Volume group "cl" successfully extended
[root@localhost ~]#
[root@localhost ~]# lvextend -L +100G /dev/cl/root
Size of logical volume cl/root changed from <47.79 GiB (12233 extents) to <147.79 GiB (37833 extents).
Logical volume cl/root successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/cl-root
meta-data=/dev/mapper/cl-root isize=512 agcount=4, agsize=3131648 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=12526592, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6116, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 12526592 to 38740992
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 148G 47G 102G 32% /
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 88K 7.8G 1% /dev/shm
tmpfs 7.8G 570M 7.3G 8% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/sda1 1014M 173M 842M 18% /boot
/dev/mapper/cl-home 24G 270M 24G 2% /home
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/ba8a99b9e033fbaa80e0845eca3ab045ed30381319b368be767ad398bcd201a2/merged
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/3d5f7ac73c2a76e7f2222a5731e05c83d73ada1b6e00ba94f02bc59238fd4f55/merged
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/74dd4d799ce42fe0830267f55646f039565b9e05f6ac66baa1458106aaa5c46c/merged
tmpfs 1.6G 16K 1.6G 1% /run/user/0
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/a72e965edc3eab19d1895e8c9f13ffba9bb18d0c134443d66f10d24d55f8b856/merged
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/3b6fdb59bb758e09fb2859c058e0da6dd8ea8e3e1df2b17dd0a23ea60ebc7319/merged
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/eaaace97808b81579a3d491d17386f87a875655d63b11fdd15c76bee4695fb67/merged
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/f84e8f3234ded65a6c16fb5fdd55de300b1a45f1f20d769fc156e056bcfa57f8/merged
overlay 148G 47G 102G 32% /var/lib/docker/overlay2/0adca765f0e7f569e0d852966bfae922422024dde04b122e4d47c5b873e9d063/merged
[root@localhost ~]#
参考博客
vmware 中linux虚拟机动态添加硬盘：https://blog.csdn.net/ctypyb2002/article/details/51241907
Linux resize2fs: Bad magic number in super-block错误的解决方法：https://blog.csdn.net/csd753111111/article/details/100428614
