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parted resize problem

From: sky
Subject: parted resize problem
Date: Tue, 5 Mar 2013 17:04:31 +0800 (CST)

    I have a hard disk that parted resize have a problem, i wonder if it is a bug or not. When I execute fdisk -l in ubuntu 12.04,  infomation like that :
#fdisk -l
   Disk /dev/vdb: 21.8 GB, 21751660544 bytes
255 heads, 63 sectors/track, 2644 cylinders, total 42483712 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: 0x00094979

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1           10240    20490240    10240000+  83  Linux

so we can see it that my hard disk have 21.8GB and /dev/vdb1 is only 10GB, then i want to resize the partition /dev/vdb1 using parted.
#parted /dev/vdb
(parted) resize 1
WARNING: you are attempting to use parted to operate on (resize) a file system.
parted's file system manipulation code is not as robust as what you'll find in
dedicated, file-system-specific packages like e2fsprogs.  We recommend
you use parted only to manipulate partition tables, whenever possible.
Support for performing most operations on most types of file systems
will be removed in an upcoming release.
Start?  [5243kB]?
End?  [10.5GB]? 20GB
error: block relocator should have relocated 511
I get error but I can not get any infomations from the internet, can you help me?

Best regard

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