Unable to resize my main partition (CentOS 6.4 x86_x64) Google Cloud Compute

Question

Disk /dev/sda: 268.4 GB, 268435456000 bytes
4 heads, 32 sectors/track, 4096000 cylinders
Units = cylinders of 128 * 512 = 65536 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x0003ba74
Device Boot Start End Blocks Id System
/dev/sda1 17 163825 10483712+ 83 Linux
/dev/sda2 163841 2621440 157286400 83 Linux

root@webserver04 [/tmp]# resize2fs /dev/sda1

resize2fs 1.41.12 (17-May-2010) The filesystem is already 2620928 blocks long. Nothing to do!

root@webserver04 [/]# df -h

Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.8G 8.6G 647M 94% /
/dev/sda2 148G 34G 107G 24% /home
/dev/sdb2 483G 12G 446G 3% /backup

NOTE : Theres no rescue mode as i know on Google Cloud Compute.

Answer 1

You can't do it in this way - first you need to resize the partition- * you must umount the partition first. for example(1 is the number of the partition): parted /dev/sda resizepart 1 200G then use resize2fs /dev/sda1