CentOs磁盘扩容笔记
CentOs磁盘扩容笔记
- 查看磁盘扩容前容量 此时加起来总大小为60G
df -h
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 9.7M 1.8G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/cs-root 37G 20G 18G 54% /
/dev/nvme0n1p1 1014M 257M 758M 26% /boot
/dev/mapper/cs-home 19G 4.5G 14G 25% /home
tmpfs 371M 12K 371M 1% /run/user/42
tmpfs 371M 0 371M 0% /run/user/0
- fdisk -l 查看 磁盘分区 状况 ，此时总容量变为80，但是只有两个盘使用了60G，还有20G未显示
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 10.7G 0 rom /run/media/root/CentOS-Stream-8-x86_64-dvd
nvme0n1 259:0 0 80G 0 disk
├─nvme0n1p1 259:1 0 1G 0 part /boot
└─nvme0n1p2 259:2 0 59G 0 part
├─cs-root 253:0 0 37G 0 lvm /
├─cs-swap 253:1 0 4G 0 lvm [SWAP]
└─cs-home 253:2 0 18.1G 0 lvm /home
fdisk -l
Disk /dev/nvme0n1: 80 GiB, 85899345920 bytes, 167772160 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
Disklabel type: dos
Disk identifier: 0x654919f3
Device Boot Start End Sectors Size Id Type
/dev/nvme0n1p1 * 2048 2099199 2097152 1G 83 Linux
/dev/nvme0n1p2 2099200 125829119 123729920 59G 8e Linux LVM
- 增加分区显示增加的磁盘容量
fdisk /dev/nvme0n1
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type
p primary (2 primary, 0 extended, 2 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (3,4, default 3): #默认回车
First sector (125829120-167772159, default 125829120): #默认回车
Last sector, +sectors or +size{K,M,G,T,P} (125829120-167772159, default 167772159): #默认回车
Created a new partition 3 of type 'Linux' and of size 20 GiB.
Command (m for help): w
The partition table has been altered.
Syncing disks.
fdisk -l 查看分区
fdisk -l
Disk /dev/nvme0n1: 80 GiB, 85899345920 bytes, 167772160 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
Disklabel type: dos
Disk identifier: 0x654919f3
Device Boot Start End Sectors Size Id Type
/dev/nvme0n1p1 * 2048 2099199 2097152 1G 83 Linux
/dev/nvme0n1p2 2099200 125829119 123729920 59G 8e Linux LVM
/dev/nvme0n1p3 125829120 167772159 41943040 20G 83 Linux # 此为新增加的扩展盘
- 增加系统识别
执行 partprobe
-
创建物理卷 注意名称为新创建的卷 /dev/nvme0n1p3
pvcreate /dev/nvme0n1p3 Physical volume "/dev/nvme0n1p3" successfully created. -
扩展卷组
查看卷组信息：
vgdisplay
--- Volume group --- VG Name cs System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 6 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3扩展卷组
vgextend cs /dev/nvme0n1p3
Volume group “cs” successfully extended -
增加home的大小，此时要注意挂载20G不一定有20G的空间，就会报Insufficient free space
lvresize -L +19G /dev/mapper/cs-home Size of logical volume cs/home changed from 18.06 GiB (4624 extents) to 37.06 GiB (9488 extents). Logical volume cs/home successfully resized.原因是：执行pvdisplay可以看到可用的PE数量是5119，而每个PE大小是4.00MiB，所以其实这个卷组实际的可用空间其实不是20G，而是19.99G
- 此时 df -h 查看没有任何变化，/dev/mapper/cs-home还是19G
df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 1.8G 0 1.8G 0% /dev tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 1.9G 9.6M 1.8G 1% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/mapper/cs-root 37G 20G 18G 54% / /dev/nvme0n1p1 1014M 257M 758M 26% /boot /dev/mapper/cs-home 19G 4.5G 14G 25% /home tmpfs 371M 12K 371M 1% /run/user/42 tmpfs 371M 0 371M 0% /run/user/0vgdisplay 查看磁盘空间已经增加，从60G变为 78.99 GiB
vgdisplay
--- Volume group ---
VG Name cs
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size 78.99 GiB
PE Size 4.00 MiB
Total PE 20222
Alloc PE / Size 19967 / <78.00 GiB
Free PE / Size 255 / 1020.00 MiB
VG UUID fQivhZ-JtEj-97ae-iH7X-XSBA-xWh5-etfV1h
需要执行，文件系统的同步，之前只是对逻辑卷的扩容
xfs_growfs /dev/mapper/cs-home
再次df -h 查看已经变为38G
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 9.6M 1.8G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/cs-root 37G 20G 18G 54% /
/dev/nvme0n1p1 1014M 257M 758M 26% /boot
/dev/mapper/cs-home 38G 4.6G 33G 13% /home
tmpfs 371M 0 371M 0% /run/user/0
参考：
https://blog.csdn.net/qw6r5/article/details/127167217
https://blog.51cto.com/u_7961702/5526676