1．为主机增加80G SCSI 接口硬盘
编辑虚拟机设置添加80Gscsi的硬盘
2．划分三个各20G的主分区
[root@localhost ~]# 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。
命令(输入 m 获取帮助)：p
磁盘 /dev/sdb：85.9 GB, 85899345920 字节，167772160 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘标签类型：dos
磁盘标识符：0xcdb7e1bc
设备 Boot Start End Blocks Id System
/dev/sdb1 2048 41945087 20971520 8e Linux LVM
/dev/sdb2 41945088 83888127 20971520 8e Linux LVM
/dev/sdb3 83888128 125831167 20971520 8e Linux LVM
命令(输入 m 获取帮助)：
3．将三个主分区转换为物理卷（pvcreate），扫描系统中的物理卷
[root@localhost ~]# pvcreate /dev/sdb[123]
Device mypv not found (or ignored by filtering).
Physical volume "/dev/sdb1" successfully created.
Physical volume "/dev/sdb2" successfully created.
Physical volume "/dev/sdb3" successfully created.
[root@localhost ~]# pvscan
PV /dev/sda2 VG cl lvm2 [39.00 GiB / 4.00 MiB free]
PV /dev/sdb2 lvm2 [20.00 GiB]
PV /dev/sdb1 lvm2 [20.00 GiB]
PV /dev/sdb3 lvm2 [20.00 GiB]
Total: 4 [99.00 GiB] / in use: 1 [39.00 GiB] / in no VG: 3 [60.00 GiB]
[root@localhost ~]#
4．使用两个物理卷创建卷组，名字为myvg，查看卷组大小
[root@localhost ~]# vgcreate myvg /dev/sdb[12]
Volume group "myvg" successfully created
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name cl
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 39.00 GiB
PE Size 4.00 MiB
Total PE 9983
Alloc PE / Size 9982 / 38.99 GiB
Free PE / Size 1 / 4.00 MiB
VG UUID YMceZd-sJSi-iEum-5ixe-Mvcg-a5GE-MAvThM
--- Volume group ---
VG Name myvg
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 39.99 GiB
PE Size 4.00 MiB
Total PE 10238
Alloc PE / Size 0 / 0
Free PE / Size 10238 / 39.99 GiB
VG UUID 5nANHH-0kiW-GZvz-cTed-qDFR-6IwZ-5lkQbm
z
5．创建逻辑卷mylv，大小为30G
[root@localhost ~]# lvcreate -L +30G -n mylv myvg
Invalid argument for --extents: +30G
Error during parsing of command line.
[root@localhost ~]# lvscan
ACTIVE '/dev/cl/swap' [2.00 GiB] inherit
ACTIVE '/dev/cl/root' [36.99 GiB] inherit
6．将逻辑卷格式化成xfs文件系统，并挂载到/data目录上，创建文件测试
pv vg lv
[root@localhost ~]# mkfs -t xfs /dev/myvg/mylv
meta-data=/dev/myvg/mylv isize=512 agcount=4, agsize=1966080 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=7864320, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=3840, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@localhost ~]# mkdir /data
[root@localhost ~]# mount /dev/myvg/mylv /data
[root@localhost ~]# df -Th
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/cl-root xfs 37G 5.3G 32G 15% /
devtmpfs devtmpfs 977M 0 977M 0% /dev
tmpfs tmpfs 993M 88K 993M 1% /dev/shm
tmpfs tmpfs 993M 8.9M 984M 1% /run
tmpfs tmpfs 993M 0 993M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 155M 860M 16% /boot
tmpfs tmpfs 199M 20K 199M 1% /run/user/0
/dev/sr0 iso9660 4.1G 4.1G 0 100% /run/media/root/CentOS 7 x86_64
/dev/mapper/myvg-mylv xfs 30G 33M 30G 1% /data
7．增大逻辑卷到35G
[root@localhost ~]# lvextend -L +5G /dev/myvg/mylv
Size of logical volume myvg/mylv changed from 30.00 GiB (7680 extents) to 35.00 GiB (8960 extents).
Logical volume myvg/mylv successfully resized.
[root@localhost ~]# resize2fs /dev/myvg/mylv
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block 当尝试打开 /dev/myvg/mylv 时
找不到有效的文件系统超级块.
[root@localhost ~]# df-Th
bash: df-Th: 未找到命令...
[root@localhost ~]# df -Th
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/cl-root xfs 37G 5.3G 32G 15% /
devtmpfs devtmpfs 977M 0 977M 0% /dev
tmpfs tmpfs 993M 88K 993M 1% /dev/shm
tmpfs tmpfs 993M 8.9M 984M 1% /run
tmpfs tmpfs 993M 0 993M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 155M 860M 16% /boot
tmpfs tmpfs 199M 20K 199M 1% /run/user/0
/dev/sr0 iso9660 4.1G 4.1G 0 100% /run/media/root/CentOS 7 x86_64
/dev/mapper/myvg-mylv xfs 30G 33M 30G 1% /data
[root@localhost ~]# resize2fs /dev/myvg/mylv
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block 当尝试打开 /dev/myvg/mylv 时
找不到有效的文件系统超级块.
[root@localhost ~]# lvdisplay /dev/myvg/mylv
--- Logical volume ---
LV Path /dev/myvg/mylv
LV Name mylv
VG Name myvg
LV UUID zMxvhf-U7Zm-6liE-U1ix-qqof-iVog-t4Vkce
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2019-08-02 15:47:32 +0800
LV Status available
# open 1
LV Size 35.00 GiB
Current LE 8960
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
[root@localhost ~]# df -Th
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/cl-root xfs 37G 5.3G 32G 15% /
devtmpfs devtmpfs 977M 0 977M 0% /dev
tmpfs tmpfs 993M 88K 993M 1% /dev/shm
tmpfs tmpfs 993M 8.9M 984M 1% /run
tmpfs tmpfs 993M 0 993M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 155M 860M 16% /boot
tmpfs tmpfs 199M 20K 199M 1% /run/user/0
/dev/sr0 iso9660 4.1G 4.1G 0 100% /run/media/root/CentOS 7 x86_64
/dev/mapper/myvg-mylv xfs 30G 33M 30G 1% /data
[root@localhost ~]# xfs_growfs /dev/myvg/mylv
meta-data=/dev/mapper/myvg-mylv isize=512 agcount=4, agsize=1966080 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=7864320, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=3840, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 7864320 to 9175040
[root@localhost ~]# df -Th
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/cl-root xfs 37G 5.3G 32G 15% /
devtmpfs devtmpfs 977M 0 977M 0% /dev
tmpfs tmpfs 993M 88K 993M 1% /dev/shm
tmpfs tmpfs 993M 8.9M 984M 1% /run
tmpfs tmpfs 993M 0 993M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 155M 860M 16% /boot
tmpfs tmpfs 199M 20K 199M 1% /run/user/0
/dev/sr0 iso9660 4.1G 4.1G 0 100% /run/media/root/CentOS 7 x86_64
/dev/mapper/myvg-mylv xfs 35G 33M 35G 1% /data
8．编辑/etc/fstab文件挂载逻辑卷，并支持磁盘配额选项
#
# /etc/fstab
# Created by anaconda on Mon Jul 22 05:05:10 2019
#
# 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
#
/dev/mapper/cl-root / xfs defaults 0 0
UUID=76d25011-eded-4f3e-be88-c5b85959ddff /boot xfs defaults 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
/dev/myvg/mylv /data xfs deafaults 0 0