根分區是LVM時
查看磁盤空間
[root@xiaoagiao /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 17G 1.3G 16G 8% / #根分區大小爲17G
devtmpfs 475M 0 475M 0% /dev
tmpfs 487M 0 487M 0% /dev/shm
tmpfs 487M 7.5M 479M 2% /run
tmpfs 487M 0 487M 0% /sys/fs/cgroup
/dev/sr0 918M 918M 0 100% /media
/dev/sda1 1014M 133M 882M 14% /boot
tmpfs 98M 0 98M 0% /run/user/0
查看磁盤分區情況
[root@xiaoagiao /]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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: 0x000e174e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM #/dev/sda2就是根分區，默認爲LVM
Disk /dev/mapper/centos-root: 18.2 GB, 18249416704 bytes, 35643392 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: 2147 MB, 2147483648 bytes, 4194304 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
步驟
- 關機，添加一塊新的磁盤
![在這裏插入圖片描述]()
2. 查看新加入的磁盤
2. 查看新加入的磁盤[root@xiaoagiao ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 19G 0 part
├─centos-root 253:0 0 17G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 100G 0 disk #sdb 大小爲100g
sr0 11:0 1 918M 0 rom /media
- 對sdb進行分區
[root@xiaoagiao ~]# fdisk /dev/sdb #對/dev/sdb進行分區
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xb6372483.
Command (m for help): m #m：顯示幫助
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): n #創建一塊新的分區
Partition type:
p primary (0 primary, 0 extended, 4 free) #p：主分區
e extended #e：擴展分區
Select (default p): p
Partition number (1-4, default 1): 1 #分區編號sdb1
First sector (2048-209715199, default 2048): #分區開始柱面編號，一般默認
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199): +90G #分區大小
Partition 1 of type Linux and of size 90 GiB is set
Command (m for help): w #w：保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
- 刷新一下磁盤，把心分區做成pv
[root@xiaoagiao ~]# partprobe /dev/sdb
[root@xiaoagiao ~]# partprobe /dev/sdb1 #刷新磁盤，讓系統找到新添加的磁盤
[root@xiaoagiao ~]# pvcreate /dev/sdb1 #將/dev/sdb1做成pv
Physical volume "/dev/sdb1" successfully created.
[root@xiaoagiao ~]# pvs #查看pv信息
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <19.00g 0
/dev/sdb1 lvm2 --- 90.00g 90.00g
[root@xiaoagiao ~]# pvdisplay #pv詳細信息
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <19.00 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 4863
Free PE 0
Allocated PE 4863
PV UUID exe6Gy-94VE-9UAH-6qCG-DB7k-PWME-6bz4u6
"/dev/sdb1" is a new physical volume of "90.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 90.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID sHKVIM-KNWc-hbtx-8gYL-b24l-CxQa-SSPmRm
- 將新添加的pv擴展到root的vg中
[root@xiaoagiao ~]# vgs # 先查看當前vg情況
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz--n- <19.00g 0 #現在根分區的vg名字爲centos ，大小爲小於19g
[root@xiaoagiao ~]# vgextend centos /dev/sdb1 #將/dev/sdb1加入到centos中
Volume group "centos" successfully extended
[root@xiaoagiao ~]# vgs #再次查看vg，大小爲108.9g
VG #PV #LV #SN Attr VSize VFree
centos 2 2 0 wz--n- 108.99g <90.00g
[root@xiaoagiao ~]# 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 108.99 GiB
PE Size 4.00 MiB
Total PE 27902
Alloc PE / Size 4863 / <19.00 GiB
Free PE / Size 23039 / <90.00 GiB
VG UUID VWTn40-zXfH-77PH-riAc-HC1U-5lqQ-1juay8
- 擴展根分區lv邏輯卷
[root@xiaoagiao ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- <17.00g
swap centos -wi-ao---- 2.00g
[root@xiaoagiao ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/root #查看詳情得知邏輯卷名稱爲/dev/centos/root
LV Name root
VG Name centos
LV UUID X1J3Oq-1NCY-pyv2-UmcC-5PtK-Maf5-5YWJto
LV Write Access read/write
LV Creation host, time xiaoagiao, 2020-02-15 17:41:52 +0800
LV Status available
# open 1
LV Size <17.00 GiB #大小小於17G
Current LE 4351
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID m4d0ur-Iz58-UAfd-tIPd-N5gM-Eqf8-NQvbvv
LV Write Access read/write
LV Creation host, time xiaoagiao, 2020-02-15 17:41:53 +0800
LV Status available
# open 2
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
[root@xiaoagiao ~]# lvextend -l +100%FREE /dev/centos/root #擴展邏輯卷大小，-l：指定大小，+100%FREE：指定全部可用空間
Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to 106.99 GiB (27390 extents).
Logical volume centos/root successfully resized.
[root@xiaoagiao ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 106.99g #現在根分區物理卷大小106.99g
swap centos -wi-ao---- 2.00g
- 最後：刷新根分區 xfs_growfs /dev/centos/root
- 由於文件系統屬於xfs,所以使用xfs_growfs,resize2fs無效
[root@xiaoagiao mapper]# 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 28047360
[root@xiaoagiao mapper]# df -h #再次查看，根分區成功擴容到107G
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 107G 1.3G 106G 2% /
devtmpfs 475M 0 475M 0% /dev
tmpfs 487M 0 487M 0% /dev/shm
tmpfs 487M 7.5M 479M 2% /run
tmpfs 487M 0 487M 0% /sys/fs/cgroup
/dev/sr0 918M 918M 0 100% /media
/dev/sda1 1014M 133M 882M 14% /boot
tmpfs 98M 0 98M 0% /run/user/0