cannot detect the additional 5GB on my expanded virtual disk

pedenski · 05-25-2013, 06:03 AM

Detecting the newly added unallocated disk in UBUNTU.

Initial setup, i have 10GB of virtual disk, then i added another 5GB, total of 15GB.

fdisk -l displays below [line 1]
Disk /dev/sda: 16.1 GB, 16106127360 bytes

Code:

Disk /dev/sda: 16.1 GB, 16106127360 bytes
255 heads, 63 sectors/track, 1958 cylinders, total 31457280 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: 0x0002948a

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      499711      248832   83  Linux
/dev/sda2          501758    20969471    10233857    5  Extended
/dev/sda5          501760    20969471    10233856   8e  Linux LVM

Disk /dev/mapper/test-root: 9403 MB, 9403629568 bytes
255 heads, 63 sectors/track, 1143 cylinders, total 18366464 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: 0x00000000

Disk /dev/mapper/media-root doesn't contain a valid partition table

Disk /dev/mapper/test-swap_1: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders, total 2097152 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: 0x00000000

Disk /dev/mapper/test-swap_1 doesn't contain a valid partition table
root@test:~#

when i create a new partition using the below syntax

#fdisk /dev/sda

Code:

Partition type:
   p   primary (1 primary, 1 extended, 2 free)
   l   logical (numbered from 5)
Select (default p): p
Partition number (1-4, default 3):
Using default value 3
First sector (499712-31457279, default 499712):
Using default value 499712
Last sector, +sectors or +size{K,M,G} (499712-501757, default 501757):
Using default value 501757

Command (m for help): p

Disk /dev/sda: 16.1 GB, 16106127360 bytes
255 heads, 63 sectors/track, 1958 cylinders, total 31457280 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: 0x0002948a

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      499711      248832   83  Linux
/dev/sda2          501758    20969471    10233857    5  Extended
/dev/sda3          499712      501757        1023   83  Linux
/dev/sda5          501760    20969471    10233856   8e  Linux LVM

Partition table entries are not in disk order

Command (m for help): /dev/sda3          499712      501757        1023   83  Li
nux^C
root@test:~#

why is my

Code:

/dev/sda3          499712      501757        1023   83  Linux

only getting 1023? i dont seem to detect the additional 5GB

at398 · 05-25-2013, 07:15 AM

Is your ubuntu install in virtualbox? if it is can you not add a virtual disk to the system from settings and use gparted (or whatever tool you prefer) to format it as ext4 etc etc?

Madhu Desai · 05-25-2013, 07:54 AM

Quote:

Partition table entries are not in disk order

Probably this is because partitions are not in order. Try this

# fdisk /dev/sda
Delete /dev/sda3 partition
Hit x for expert commands
Hit f to correct partition table entry disk order
Hit r to return to main menu
Now create partition.

Hopefully you will get that lost size.

pedenski · 05-25-2013, 09:54 AM

Quote:

Originally Posted by at398

Is your ubuntu install in virtualbox? if it is can you not add a virtual disk to the system from settings and use gparted (or whatever tool you prefer) to format it as ext4 etc etc?

yes, its installed in VMware. im really considering the option of switching to ext4, instead of using lvm.
but expansion of disk in ext4 requires a reboot, i was just testing lvm because people were saying you cannot have reboot when expanding additional disk in lvm filesystem.

makes me really think about how windows does the disk expansion really easy to the user. but now im stuck with ubuntu for some reasons..

Quote:

Probably this is because partitions are not in order. Try this
# fdisk /dev/sda
Delete /dev/sda3 partition
Hit x for expert commands
Hit f to correct partition table entry disk order
Hit r to return to main menu
Now create partition.

i get this

Code:

Expert command (m for help): f
Nothing to do. Ordering is correct already.

Madhu Desai · 05-25-2013, 10:17 AM

Quote:

Originally Posted by pedenski

Expert command (m for help): f
Nothing to do. Ordering is correct already.

hmmm. /dev/sda3 is taking secotrs in the gap between sda1 and sda2 (499711 - 501758). that is why it is 1023 in size. i hoped 'fix disk ordering' will correct the problem. try to create another partition. see that partition will get rest of the sectors (20969471 and above).

Quote:

i was just testing lvm because people were saying you cannot have reboot when expanding additional disk in lvm filesystem.

It is correct. you dont need to reboot to resize lvm logical volume. in case the logical volume is '/', it recommended to resize the LV while offline. rest you can resize online.