阿里云数据盘盘扩容
环境
系统：CentOS6.10
磁盘：20G高效云盘
内核：2.6
数据盘状态：已挂载及格式化并分区
操作步骤
控制台-实例-需要扩容的ECS-需要扩容的数据盘
- 创建快照——对需要扩容磁盘进行备份
2. 点击磁盘扩容
根据需求选在扩容磁盘大小此处由20G扩容至30G
- 进入控制台重启服务（centos6需要重启才能生效），使磁盘扩容生效
[root@iZuf633xawg78i3i3n8o2yZ ~]# fdisk -l
Disk /dev/vda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003a613
Device Boot Start End Blocks Id System
/dev/vda1 * 1 2611 20970496 83 Linux
Disk /dev/vdb: 32.2 GB, 32212254720 bytes
16 heads, 63 sectors/track, 62415 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcd52d77f
Device Boot Start End Blocks Id System
/dev/vdb1 1 52012 26214016+ 83 Linux
- 运行blkid确认文件系统的类型。本示例中，
/dev/vdb1的文件系统类型为 ext4 。
[root@iZuf633xawg78i3i3n8o2yZ ~]# blkid /dev/vdb1
/dev/vdb1: UUID="c96986e3-bbdf-42cd-a4ca-0b4421329ae5" TYPE="ext4"
-
运行以下命令确认文件系统的状态
-
ext系列文件系统：
e2fsck -n <dst_dev_part_path> -
xfs文件系统：
xfs_repair -n <dst_dev_part_path>本示例中，文件系统状态为clean。如果状态不是clean，请排查并修复。
-
[root@iZuf633xawg78i3i3n8o2yZ ~]# e2fsck -n /dev/vdb1
e2fsck 1.41.12 (17-May-2010)
/dev/vdb1: clean, 16/1638400 files, 146854/6553504 blocks
```
6. 此处内核为2.6,需要先取消已挂载的磁盘(根据内核版本选择具体步骤,详见阿里云文档)
```bash
umount /dev/vdb1
7.使用fdisk命令删除旧分区。
[root@iZuf633xawg78i3i3n8o2yZ ~]# fdisk /dev/vdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): d
Selected partition 1
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
8.使用fdisk命令新建分区。
[root@iZuf633xawg78i3i3n8o2yZ ~]# fdisk /dev/vdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): d
Selected partition 1
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@iZuf633xawg78i3i3n8o2yZ ~]# fdisk /dev/vdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-62415, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-62415, default 62415):
Using default value 62415
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
警告
- 新分区的起始位置，必须和旧分区的起始位置相同。
- 新分区的结束位置，必须大于旧分区的结束位置，否则会导致扩容失败。
- 运行
lsblk /dev/vdb确保分区表已经增加。
[root@iZuf633xawg78i3i3n8o2yZ ~]# lsblk /dev/vdb
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vdb 252:16 0 30G 0 disk
└─vdb1 252:17 0 30G 0 part
- 运行
e2fsck -n /dev/vdb1再次检查文件系统，确认扩容分区后的文件系统状态为clean。
[root@iZuf633xawg78i3i3n8o2yZ ~]# e2fsck -n /dev/vdb1
e2fsck 1.41.12 (17-May-2010)
/dev/vdb1: clean, 16/1638400 files, 146854/6553504 blocks
-
通知内核更新分区表
partx -a /dev/vdb1 /dev/vdb -
扩容文件系统
resize2fs /dev/vdb1注:可能会提示先运行
e2fsck -f /dev/vdb1 -
挂载扩容后的分区
mount /dev/vdb1 /data -
使用
df命令查看磁盘挂载情况[root@iZuf633xawg78i3i3n8o2yZ ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/vda1 20G 1.3G 18G 7% / tmpfs 498M 0 498M 0% /dev/shm /dev/vdb1 30G 44M 28G 1% /data
扩容成功