2015-11-19

aliyunEC云主机磁盘安全扩容

云主机磁盘（块设备），实际是虚拟文件，当磁盘空间不够时，可以在云服务提供商后台增加磁盘容量，下面是用户需要做的操作。

系统版本：CentOS6
数据盘文件系统：xfs
数据盘挂载点：/mount_point
数据盘设备名：/dev/xvdb
当前容量: df -lh
/dev/xvdb1 27G 23G 4.0G 85% /mount_point
扩容后容量：

步骤：

停止服务 service nginx stop
查看是否有其他程序正在打开分区lsof /mount_point
umount分区 umount /mount_point

查看磁盘信息，可看到这块盘已经是100GB大小，但是系统还不能使用。

# fdisl -l /dev/xvdb
Disk /dev/xvdb: 107.4 GB, 107374182400 bytes, 209715200     sectors
Device       Start      End         Blocks     Id  System
/dev/xvdb1   7999488    62914559    27457536   83  Linux

修改分区表

# fdisk /dev/xvdb
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.
Command (m for help): p
Disk /dev/xvdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000dc675
    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1         7999488    62914559    27457536   83  Linux
Command (m for help): d
Selected partition 1
Partition 1 is deleted
Command (m for help): p
Disk /dev/xvdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000dc675
    Device Boot      Start         End      Blocks   Id  System
Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 
First sector (2048-209715199, default 2048): 7999488
Last sector, +sectors or +size{K,M,G} (7999488-209715199, default 209715199): 
Using default value 209715199
Partition 1 of type Linux and of size 96.2 GiB is set
Command (m for help): p
Disk /dev/xvdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000dc675
    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1         7999488   209715199   100857856   83  Linux
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.

查看修改结果

# fdisk -l /dev/xvdb
Disk /dev/xvdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000dc675
    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1         7999488   209715199   100857856   83  Linux

使用xfs_growfs命令对xfs文件系统进行扩容

# xfs_growfs /dev/xvdb1 
meta-data=/dev/xvdb1             isize=256    agcount=4, agsize=1716096 blks
         =                       sectsz=512   attr=2, projid32bit=0
         =                       crc=0
data     =                       bsize=4096   blocks=6864384, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=3351, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 6864384 to 25214464

挂载分区# mount -a

查看目前可用空间

# df -lh
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvdb1       97G   23G   74G  24% /mount_point

aliyun磁盘原地扩容官方说明

aliyun磁盘原地扩容官方操作说明