Issue
I have a Amazon Web Services EC2 Debian 8.0 instance with an Elastic Block Storage (EBS) volume of 35GB. fdisk correctly shows the size but my root partition is still at 7.8G, although I tried to execute resize2fs.
root@ip-10-0-3-164:/home/admin# fdisk -l
Disk /dev/xvda: 35 GiB, 37580963840 bytes, 73400320 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
Disklabel type: dos
Disk identifier: 0x7d936f86
Device Boot Start End Sectors Size Id Type
/dev/xvda1 * 4096 16773119 16769024 8G 83 Linux
root@ip-10-0-3-164:/home/admin# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 7.8G 2.1G 5.3G 29% /
udev 10M 0 10M 0% /dev
tmpfs 200M 4.3M 196M 3% /run
tmpfs 500M 0 500M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 500M 0 500M 0% /sys/fs/cgroup
root@ip-10-0-3-164:/home/admin# resize2fs /dev/xvda1
resize2fs 1.42.12 (29-Aug-2014)
The filesystem is already 2096128 (4k) blocks long. Nothing to do!
root@ip-10-0-3-164:/home/admin# fdisk /dev/xvda
Welcome to fdisk (util-linux 2.25.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/xvda: 35 GiB, 37580963840 bytes, 73400320 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
Disklabel type: dos
Disk identifier: 0x7d936f86
Device Boot Start End Sectors Size Id Type
/dev/xvda1 * 4096 16773119 16769024 8G 83 Linux
Command (m for help): n
Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2): 2
First sector (2048-73400319, default 2048): 2048
Last sector, +sectors or +size{K,M,G,T,P} (2048-4095, default 4095):
Created a new partition 2 of type 'Linux' and of size 1 MiB.
Command (m for help): p
Disk /dev/xvda: 35 GiB, 37580963840 bytes, 73400320 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
Disklabel type: dos
Disk identifier: 0x7d936f86
Device Boot Start End Sectors Size Id Type
/dev/xvda1 * 4096 16773119 16769024 8G 83 Linux
/dev/xvda2 2048 4095 2048 1M 83 Linux
Partition table entries are not in disk order.
Command (m for help): t
Partition number (1,2, default 2): 2
Hex code (type L to list all codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes): 82
Changed type of partition 'Linux' to 'Linux swap / Solaris'.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: 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).
root@ip-10-0-3-164:/home/admin# fdisk /dev/xvda
Welcome to fdisk (util-linux 2.25.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/xvda: 35 GiB, 37580963840 bytes, 73400320 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
Disklabel type: dos
Disk identifier: 0x7d936f86
Device Boot Start End Sectors Size Id Type
/dev/xvda1 * 4096 16773119 16769024 8G 83 Linux
/dev/xvda2 2048 4095 2048 1M 82 Linux swap / Solaris
Partition table entries are not in disk order.
As you see, the resize2fs does not have effect. I also cannot create a swap partition with more space than 1M.
This problem occurs on all my instances. Although they all have 30-35GB EBS volumes, I cannot resize them and they stay at 8GB. When I attach just an additional volume besides the root mounted one, it works fine.
Can you help me?
Solution
Forget the other answers. I just spent 3 days figuring out the root cause and a simple workaround:
https://serverfault.com/questions/748063/debian-8-ami-only-using-8gb-partition
Answered By - shrimpwagon
