amazon ec2 - unable to resize root partition on EC2 centos -


i created ec2 machine using community image of centos 6.3 x64. have added 35 gb disk. when #df -h 

filesystem            size  used avail use% mounted on /dev/xvda1            7.9g  1.2g  6.4g  16% / tmpfs                 7.3g     0  7.3g   0% /dev/shm

my disk 35gb showing 8 gb in root , 7 tmpfs.

i tried use resize2fs didnt work on centos. disk has ext4 partation.. 

# resize2fs /dev/xvda resize2fs 1.41.12 (17-may-2010) resize2fs: device or resource busy while trying open /dev/xvda couldn't find valid filesystem superblock.

or if tried resize2fs /dev/xvda1 says device has nothing do.

any idea or other way, root disk(/). cant unmount it.

i found way that, resize2fs not working in case not sure why says device or resource busy. found article on resizedisk using fdisk can increase block size deleting , creating , make partition bootable. requires reboot. wont effect data if use same start cylinder. 

# df -h  <<1>>  filesystem      size  used avail use% mounted on /dev/xvda1      6.0g  2.0g  3.7g  35% /  tmpfs            15g     0   15g   0% /dev/shm  # fdisk -l  <<2>>  disk /dev/xvda: 21.5 gb, 21474836480 bytes 97 heads, 17 sectors/track, 25435 cylinders units = cylinders of 1649 * 512 = 844288 bytes sector size (logical/physical): 512 bytes / 512 bytes i/o size (minimum/optimal): 512 bytes / 512 bytes disk identifier: 0x0003b587      device boot      start         end      blocks   id  system /dev/xvda1   *           2        7632     6291456   83  linux  # fdisk /dev/xvda  <<3>>  warning: dos-compatible mode deprecated. it's recommended          switch off mode (command 'c') , change display units          sectors (command 'u').  command (m help): u  <<4>> changing display/entry units sectors  command (m help): p  <<5>>  disk /dev/xvda: 21.5 gb, 21474836480 bytes 97 heads, 17 sectors/track, 25435 cylinders, total 41943040 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: 0x0003b587      device boot      start         end      blocks   id  system /dev/xvda1   *        2048    12584959     6291456   83  linux  command (m help): d  <<6>> selected partition 1  command (m help): n  <<7>> command action    e   extended    p   primary partition (1-4) p  <<8>> partition number (1-4): 1  <<9>> first sector (17-41943039, default 17): 2048  <<10>> last sector, +sectors or +size{k,m,g} (2048-41943039, default 41943039): <<11>> using default value 41943039  command (m help): p <<12>>  disk /dev/xvda: 21.5 gb, 21474836480 bytes 97 heads, 17 sectors/track, 25435 cylinders, total 41943040 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: 0x0003b587      device boot      start         end      blocks   id  system /dev/xvda1            2048    41943039    20970496   83  linux  command (m help):  <<13>> partition number (1-4): 1  <<14>>   command (m help): w  <<15>> partition table has been altered!  calling ioctl() re-read partition table.  warning: re-reading partition table failed error 16: device or resource busy. kernel still uses old table. new table used @ next reboot or after run partprobe(8) or kpartx(8) syncing disks.  # reboot  <<16>>  <wait>  # df -h  <<17>> filesystem      size  used avail use% mounted on /dev/xvda1       20g  2.0g   17g  11% /  tmpfs            15g     0   15g   0% /dev/shm  # resize2fs /dev/xvda1  <<18>> resize2fs 1.41.12 (17-may-2010) filesystem 5242624 blocks long.  nothing do!

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