一：LVM
刚刚加入一个盘
1.创建物理卷
[root@nfs ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created.
2.创建卷组
[root@nfs ~]# vgcreate vgnfs /dev/sdb
Volume group "vgnfs" successfully created
3.创建逻辑卷
[root@nfs ~]# lvcreate vgnfs -l 100%free -n lvnfs
Logical volume "lvnfs" created.
4.格式化磁盘
[root@nfs ~]# mkfs.xfs /dev/vgnfs/lvnfs
meta-data=/dev/vgnfs/lvnfs isize=512 agcount=4, agsize=1310464 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5241856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
5.创建挂载目录
[root@nfs ~]# mkdir /projent
6.查看UUID
[root@nfs ~]# blkid
/dev/mapper/vgnfs-lvnfs: UUID="8dfdb783-8793-4a6a-9f23-7f91d0793a41" TYPE="xfs"
7.写入挂载文件/etc/fstab
[root@nfs ~]# vim /etc/fstab
UUID=8dfdb783-8793-4a6a-9f23-7f91d0793a41 /projent xfs defaults 0 0
8.自动挂载
[root@nfs ~]# mount -a
9.完成
二：在线扩容
添加一个盘扩容/
挂载/的盘叫centos-root
卷组名是centos 逻辑卷名是root 现在盘大小为17G，加一个20G的盘最后是37G
1.创建物理盘
[root@nfs ~]# pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created.
2.使用扩容命令对centos卷组扩容
[root@nfs ~]# vgextend centos /dev/sdc
Volume group "centos" successfully extended
3.扩展逻辑卷
[root@nfs ~]# lvextend -l +100%FREE /dev/centos/root
Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to 36.99 GiB (9470 extents).
Logical volume centos/root successfully resized.
4.调整文件系统格式
[root@nfs ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=1113856 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=4455424, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 4455424 to 9697280
5.完成扩容，从17G扩容到37G
[root@nfs ~]# df -h
