现状

首先，查看磁盘/卷组总览，已经创建了卷组(VG)，并且已经有了一些逻辑卷(LV)

# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 64G 0 disk

├─sda1 8:1 0 953M 0 part /boot

└─sda2 8:2 0 60.6G 0 part

├─rootvg-lvroot 253:0 0 29.2G 0 lvm /

├─rootvg-lvswap 253:1 0 18.6G 0 lvm [SWAP]

├─rootvg-lvopt 253:2 0 9.7G 0 lvm /opt

├─rootvg-lvvar 253:3 0 4G 0 lvm /var

└─rootvg-lvhome 253:4 0 1G 0 lvm /home

sdb 8:16 0 1000G 0 disk

└─sdb1 8:17 0 1000G 0 part

└─rootvg-lvvar 253:3 0 4G 0 lvm /var

sr0 11:0 1 1024M 0 rom

查看卷组：vgs，卷组为rootvg

# vgs

VG #PV #LV #SN Attr VSize VFree

rootvg 2 5 0 wz--n- <1.04t <998.00g

查看逻辑卷详情：

# lvdisplay

--- Logical volume ---

LV Path /dev/rootvg/lvopt

LV Name lvopt

VG Name rootvg

LV UUID Ij6kSS-94a7-nXbM-jmyj-amEK-85aj-v43ina

LV Write Access read/write

LV Creation host, time localhost.localdomain, 2017-02-20 14:42:55 +0800

LV Status available

# open 1

LV Size <9.73 GiB

Current LE 2490

Segments 2

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:2

--- Logical volume ---

.......省略........

新增逻辑卷

在VG下创建逻辑卷(LV)，名称为lvelk，大小为20GB

lvcreate -L 20G -n /dev/rootvg/lvelk rootvg

查看逻辑卷信息：

# lvs

LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert

lvelk rootvg -wi-a----- 20.00g

lvhome rootvg -wi-ao---- 1.00g

lvopt rootvg -wi-ao---- <9.73g

lvroot rootvg -wi-ao---- <29.20g

lvswap rootvg -wi-ao---- <18.63g

lvvar rootvg -wi-ao---- 4.00g

使用 mkfs.xfs 格式化为 lvelk 为 xfs 文件系统

# mkfs.xfs /dev/rootvg/lvelk

meta-data=/dev/rootvg/lvelk isize=512 agcount=4, agsize=1310720 blks

= sectsz=512 attr=2, projid32bit=1

= crc=1 finobt=0, sparse=0

data = bsize=4096 blocks=5242880, 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

挂载到新的目录下

创建新的目录

mkdir /elk

挂载到 /elk 目录下

mount /dev/rootvg/lvelk /elk

查看磁盘/卷总览

# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 64G 0 disk

├─sda1 8:1 0 953M 0 part /boot

└─sda2 8:2 0 60.6G 0 part

├─rootvg-lvroot 253:0 0 29.2G 0 lvm /

├─rootvg-lvswap 253:1 0 18.6G 0 lvm [SWAP]

├─rootvg-lvopt 253:2 0 9.7G 0 lvm /opt

├─rootvg-lvvar 253:3 0 4G 0 lvm /var

└─rootvg-lvhome 253:4 0 1G 0 lvm /home

sdb 8:16 0 1000G 0 disk

└─sdb1 8:17 0 1000G 0 part

├─rootvg-lvvar 253:3 0 4G 0 lvm /var

└─rootvg-lvelk 253:5 0 20G 0 lvm /elk

sr0 11:0 1 1024M 0 rom

设置开机自动挂载

编辑 /etc/fstab 文件，加入最后一行 vi /etc/fstab

#

# /etc/fstab

# Created by anaconda on Mon Feb 20 14:42:58 2017

#

# 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/rootvg-lvroot / xfs defaults 0 0

UUID=9e4cd7c6-140e-4ca2-b31d-20e1bdbbfcdd /boot xfs defaults 0 0

/dev/mapper/rootvg-lvhome /home xfs defaults 0 0

/dev/mapper/rootvg-lvopt /opt xfs defaults 0 0

/dev/mapper/rootvg-lvvar /var xfs defaults 0 0

/dev/mapper/rootvg-lvswap swap swap defaults 0 0

/dev/mapper/rootvg-lvelk /elk xfs defaults 0 0