磁盘扩容失败

用fdisk -l 显示有214.7GB


Disk /dev/xvdb: 214.7 GB, 214748364800 bytes
240 heads, 16 sectors/track, 109226 cylinders, total 419430400 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 identifier: 0xb44b349c


    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1            2048   314572799   157285376   83  Linux


用fdisk 删除分区后显示只有161.1GB



Command (m for help): p


Disk /dev/xvdb1: 161.1 GB, 161060225024 bytes
1 heads, 32 sectors/track, 9830336 cylinders, total 314570752 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 identifier: 0xbb8a20bd


      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): 1
First sector (2048-314570751, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-314570751, default 314570751):
Using default value 314570751


Command (m for help): wq
The partition table has been altered!


Calling ioctl() to re-read partition table.


WARNING: Re-reading the partition table failed with error 22: Invalid argument.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.


无论怎么重新创建新的分区，大小只有161.1GB
我已经按照这个操作过了，没有任何作用：
helpcdn.aliyun.com/knowledge_detail/41348.html
help.aliyun.com/document_detail/25452.html?spm=5176.doc35095.2.5.rnNj0b