VirtualBox CentOS 7 LVM 动态扩容笔记
由于安装创建虚拟机 CentOS 时选择默认的值,硬盘只有 8G,服务器采集几天图片站数据后,导致无法写入数据。默认安装 CentOS 系统是使用 LVM 的。
查看新添加的硬盘
[root@localhost ~]# fdisk -l
Disk /dev/sda: 10.7 GB, 10737418240 bytes, 20971520 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: 0x000af5d7
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 20971519 9436160 8e Linux LVM
Disk /dev/sdb: 53.7 GB, 53687091200 bytes, 104857600 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: 0x99c99f74
Device Boot Start End Blocks Id System
Disk /dev/mapper/centos-root: 8585 MB, 8585740288 bytes, 16769024 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/centos-swap: 1073 MB, 1073741824 bytes, 2097152 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
创建 pv
[root@localhost ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb1" successfully created.
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <9.00 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 2303
Free PE 0
Allocated PE 2303
PV UUID RFxCtw-Bn4n-cdzd-tIDc-0I7a-fkX7-lnVI48
"/dev/sdb" is a new physical volume of "50.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb
VG Name
PV Size 50.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID zJ0Cd0-fBB9-eaKO-C4vD-FsiA-tNfN-CADls7
扩容 vg
[root@localhost ~]# vgextend centos /dev/sdb
Volume group "centos" successfully extended
[root@localhost ~]# 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 58.99 GiB
PE Size 4.00 MiB
Total PE 15102
Alloc PE / Size 2303 / <9.00 GiB
Free PE / Size 12799 / <50.00 GiB
VG UUID XmC3TU-afw3-WHse-YIdQ-dRSp-yIbu-2TIbUn
扩容 lv
[root@localhost ~]# lvextend -L +40G /dev/centos/root
Size of logical volume centos/root changed from <8.00 GiB (2047 extents) to <48.00 GiB (12287 extents).
Logical volume centos/root successfully resized.
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID VPOwhA-B0yR-S7On-y4DJ-rpsF-2KbE-t26jwv
LV Write Access read/write
LV Creation host, time localhost, 2018-04-21 06:16:07 -0400
LV Status available
# open 2
LV Size 1.00 GiB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID 7vp7ZU-JaIl-21ns-iGy3-9S8i-h5lF-vx3ery
LV Write Access read/write
LV Creation host, time localhost, 2018-04-21 06:16:08 -0400
LV Status available
# open 1
LV Size <48.00 GiB
Current LE 12287
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
扩容文件系统
[root@localhost ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=524032 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=2096128, 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 2096128 to 12581888
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 48G 7.2G 41G 15% /
devtmpfs 908M 0 908M 0% /dev
tmpfs 920M 0 920M 0% /dev/shm
tmpfs 920M 8.5M 911M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
/dev/sda1 1014M 179M 836M 18% /boot
tmpfs 184M 0 184M 0% /run/user/1000