在centos7环境下实现，原来centos7的磁盘分区是lv+xfs格式。
现在需要添加一块磁盘来扩展LV的空间。步骤日志如下：
查看原来磁盘格式：
[[email protected]~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-rootxfs 18G 947M 17G 6% /
devtmpfs devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs tmpfs 1.9G 8.5M 1.9G 1% /run
tmpfs tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 xfs 497M 120M 378M 25% /boot
发现新加磁盘名称为/dev/sdb
[[email protected]~]# fdisk -l
Disk/dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Diskidentifier: 0x0008e34b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 41943039 20458496 8e Linux LVM
Disk/dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disk/dev/mapper/centos-root: 18.8 GB, 18756927488 bytes, 36634624 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disk/dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
分区新磁盘 如果大于2T磁盘使用parted工具
[[email protected]~]# fdisk /dev/sdb
Welcometo fdisk (util-linux 2.23.2).
Changeswill remain in memory only, until you decide to write them.
Becareful before using the write command.
Devicedoes not contain a recognized partition table
Buildinga new DOS disklabel with disk identifier 0x1cfab789.
Command(m for help): p
Disk/dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Diskidentifier: 0x1cfab789
Device Boot Start End Blocks Id System
Command(m for help): n
Partitiontype:
p primary (0 primary, 0 extended, 4 free)
e extended
Select(default p): p
Partitionnumber (1-4, default 1):
Firstsector (2048-83886079, default 2048):
Usingdefault value 2048
Lastsector, +sectors or +size{K,M,G} (2048-83886079, default 83886079):
Usingdefault value 83886079
Partition1 of type Linux and of size 40 GiB is set
Command(m for help): w
Thepartition table has been altered!
Callingioctl() to re-read partition table.
Syncingdisks.
[[email protected]~]# fdisk -l
Disk/dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Diskidentifier: 0x0008e34b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 41943039 20458496 8e Linux LVM
Disk/dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Diskidentifier: 0x1cfab789
Device Boot Start End Blocks Id System
/dev/sdb1 2048 83886079 41942016 83 Linux
Disk/dev/mapper/centos-root: 18.8 GB, 18756927488 bytes, 36634624 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
Disk/dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units= sectors of 1 * 512 = 512 bytes
Sectorsize (logical/physical): 512 bytes / 512 bytes
I/Osize (minimum/optimal): 512 bytes / 512 bytes
查看原来lv状态
[[email protected]~]# vgdisplay
--- Volume group ---
VG Name centos
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 19.51 GiB
PE Size 4.00 MiB
Total PE 4994
Alloc PE / Size 4984 / 19.47 GiB
Free PE / Size 10 / 40.00 MiB
VG UUID EDjB3T-qhXo-Mmml-rN8w-bPYk-AdL6-Cf0Y6u
创建物理卷
[[email protected]~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1"successfully created
将新的物理卷加入卷组中
[[email protected]~]# vgextend centos /dev/sdb1
Volume group "centos" successfullyextended
查看新加入物理卷后的卷组状态
[[email protected]~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 59.50 GiB
PE Size 4.00 MiB
Total PE 15233
Alloc PE / Size 4984 / 19.47 GiB
Free PE / Size 10249 / 40.04 GiB
VG UUID EDjB3T-qhXo-Mmml-rN8w-bPYk-AdL6-Cf0Y6u
[[email protected]~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 18G 946M 17G 6% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 8.5M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 120M 378M 25% /boot
查看增加逻辑卷容量命令lvextend的用法
[[email protected]~]# lvextend --help
lvextend: Add space to a logical volume
lvextend
[-A|--autobackup y|n]
[--alloc AllocationPolicy]
[--commandprofile ProfileName]
[-d|--debug]
[-f|--force]
[-h|--help]
[-i|--stripes Stripes [-I|--stripesizeStripeSize]]
{-l|--extents[+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] |
-L|--size[+]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
--poolmetadatasize[+]MetadataVolumeSize[bBsSkKmMgG]}
[-m|--mirrors Mirrors]
[--nosync]
[--use-policies]
[-n|--nofsck]
[--noudevsync]
[-r|--resizefs]
[-t|--test]
[--type VolumeType]
[-v|--verbose]
[--version]
LogicalVolume[Path] [PhysicalVolumePath... ]
把整个剩余容量都添加到逻辑卷中
[[email protected] ~]#lvextend -l+10249 /dev/centos/root
Size of logicalvolume centos/root changed from 17.47 GiB (4472 extents) to 57.50 GiB (14721extents).
Logical volume root successfully resized
这个地方需要说明一下，如果磁盘格式是XFS文件系统，则使用xfs_growfs命令，如果磁盘是ext格式则需要使用resize2fs命令
修改xfs文件系统容量
[[email protected] ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-rootisize=256 agcount=4, agsize=1144832blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=4579328, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime=none extsz=4096 blocks=0, rtextents=0
datablocks changed from 4579328 to 15074304
查看扩容后的逻辑卷大小
[[email protected]~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-root xfs 58G 946M 57G 2% /
devtmpfs devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs tmpfs 1.9G 8.5M 1.9G 1% /run
tmpfs tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 xfs 497M 120M 378M 25% /boot
[[email protected]~]#