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linux - Extending HDD in Ubuntu 18 Server


I am running ubuntu server 18 in hyper-v, I need to extend HDD. When i use fdisk -l I see that /dev/sda2/ have 1TB:


  Disk /dev/sda: 1 TiB, 1105954078720 bytes, 2160066560 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 4096 bytes
  I/O size (minimum/optimal): 4096 bytes / 4096 bytes
  Disklabel type: gpt
  Disk identifier: 8F74C1DF-DF9B-4FD7-AD20-87F1D8A8F989

  Device     Start        End    Sectors Size Type
 /dev/sda1   2048       4095       2048   1M BIOS boot
 /dev/sda2   4096 2160066526 2160062431   1T Linux filesystem

when i use df -h i see that /dev/sda2 have only 125G:


 Filesystem      Size  Used Avail Use% Mounted on
  udev            419M     0  419M   0% /dev
 tmpfs            90M  972K   89M   2% /run
 /dev/sda2       125G   11G  108G   9% /
 tmpfs           449M     0  449M   0% /dev/shm
 tmpfs           5.0M     0  5.0M   0% /run/lock
 tmpfs           449M     0  449M   0% /sys/fs/cgroup
 /dev/loop0       91M   91M     0 100% /snap/core/6350
 /dev/loop1       89M   89M     0 100% /snap/core/6964
/dev/loop2       98M   98M     0 100% /snap/docker/384
/dev/loop3       98M   98M     0 100% /snap/docker/372
/dev/loop4       98M   98M     0 100% /snap/docker/381
/dev/loop5       90M   90M     0 100% /snap/core/6818
tmpfs            90M     0   90M   0% /run/user/1000

What should I do, when I want to use full disk capacity? Thank you.



Answer



It seems to me like the actual partition us larger then what the filesystem thinks. This is unusual but can happen when you bitcopy the contents if a block device to a larger one.


Before doing disk operations its a good idea to back up your data as there is small chance things will go seriously wrong. Once you have backed up simply issue a command to grow the filesystem. This can usually be done online (but you can't shrink online). Assuming its on ext filesystem the command is something like resize2fs /dev/sda2 or resize4fs /dev/sda2.dependong on distro. If its not an ext filesystem there is likely an equivalent command.


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