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Erwin
Asked: 2019-11-21 01:29:32 +0800 CST

Ubuntu 18.04 disk expansion (not LVM) [duplicate]

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I need to expand the root partition of the server (not LVM) because of the need of testing. How can I expand the root partition without shutting the server down?

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.8G     0  3.8G   0% /dev
tmpfs           779M  3.5M  776M   1% /run
/dev/sdb2       126G   24G   96G  20% /
tmpfs           3.9G     0  3.9G   0% /dev/shm

$ sudo fdisk -l
Disk /dev/sda: 128 GiB, 137438953472 bytes, 268435456 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: 0x4b512b27

Device     Boot Start        End    Sectors  Size Id Type
/dev/sda1  *     2048  268433407  268431360  128G 83 Linux
resize partitioning 18.04

1 Answers

  1. OK, lets start with the fact that you don't want to shutdown the server, presumably because it's production. Therefore, the word "testing" should not be used anywhere near to a production server. Not even in jest.

    Next, I don't think I understand the screen prints. It looks like / is on sdb2, but the fdisk is for sda. Some thing inconsistent here.

    The ONLY way you can actually expand any partition that is not LVM is if you take the disk off-line. So your only way of expanding the disk, assuming you have space on sdb to do so, is if you boot a live CD and process it from there.

    Finally, why? Just why? If you have a spare disk (sda) why not simply format that and mount it as a directory into / (or one of its sub dirs)?

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