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unable to resize root partition on EC2 centos [closed]

i created my EC2 Machine using Community Image of Centos 6.3 x64. i have added a 35 GB disk. Now when i do #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 is 35GB but its showing 8 GB in root and 7 as tmpfs.

i tried to use resize2fs but it 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 to open /dev/xvda Couldn't find valid filesystem superblock. 

or even if i tried resize2fs /dev/xvda1 it says device has nothing to do.

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

like image 291
Adeel Ahmad Avatar asked Jun 03 '14 11:06

Adeel Ahmad


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How do I increase the size of my root partition?

Calling ioctl() to re-read partition table. Syncing disks. Resize the file system: # resize2fs /dev/VolGroup00/LogVol00 resize2fs 1.39 (29-May-2006) Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required Performing an on-line resize of /dev/VolGroup00/LogVol00 to 27582464 (4k) blocks.

Can root partition be resized?

If yes, you need to resize it. This is not limited to the root partition, and you can resize any partition available in the system. If you have LVM configured on your system, you do not need to worry about file system resizing, as LVM allows you to resize the file system whenever you need it.


2 Answers

i found a way to do that, resize2fs not working in case not sure why but it says device or resource busy. i found a very good article on resizedisk using fdisk we can increase block size by deleting and creating it and Make the partition bootable. all it requires is a reboot. it wont effect your data if you 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 is deprecated. It's strongly recommended to          switch off the mode (command 'c') and change display units to          sectors (command 'u').  Command (m for help): u  <<4>> Changing display/entry units to sectors  Command (m for 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 for help): d  <<6>> Selected partition 1  Command (m for 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 for 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 for help): a  <<13>> Partition number (1-4): 1  <<14>>   Command (m for help): w  <<15>> The partition table has been altered!  Calling ioctl() to re-read partition table.  WARNING: Re-reading the partition table failed with error 16: Device or resource busy. 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.  # 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) The filesystem is already 5242624 blocks long.  Nothing to do! 
like image 128
Adeel Ahmad Avatar answered Oct 11 '22 18:10

Adeel Ahmad


The following steps very simple works very well for me:

# lsblk NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda    202:0    0  30G  0 disk  └─xvda1 202:1    0   8G  0 part / 

Perform the following command as root:

# yum install cloud-utils-growpart  # growpart /dev/xvda 1  # reboot 

After the reboot:

# lsblk NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda    202:0    0  30G  0 disk  └─xvda1 202:1    0  30G  0 part / 
like image 26
Dave Side Avatar answered Oct 11 '22 17:10

Dave Side