Need some confirmation to resize a partition (without LVM)

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1

Hi,

sorry, I know this is the wrong forum … anyway can somebody take my fear and confirm, please:

I want to increase a device within Linux Ubuntu 20.04 LTS.
The device is a TARGET provided from Synology NAS to a VM within Proxmox.
The target is directly linked as HDD within the VM, consequently, this is just a simple device. I do not use LVM or anything else, it is just raw. The respective device is /dev/sda, there was just one partition /dev/sda/sda1.

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One can see that /dev/sda has 16 TB, partition sda1 is 10 TB, 6 TB are free. Is

sudo resize2fs -p /dev/sda1

simply enough or do I need to resize sda1 by cfdisk initially?

THX
Thorsten

2

Hi

To be on the safe side, you could also resize the partition by booting into SystemRescueCD and using PartEd…

All nicely with GUI…

My 2 cents
Andy

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3

But is the command

sudo resize2fs -p /dev/sda1

correct or do I need to increase /dev/sda1 with e.g. cfdisk before that command?

TIA

4

I’m not offhand sure what Ubuntu 20 uses as filesystem…
It should be correct, but I’d need to check it up.

5

If it’s the root file system you can only grow which I think is what you plan to do a few things first
IIRC btrfs filesystem and lvm are the only filesystem that support mounted grow and shrink I’m guessing your system uses ext4.

sudo resize2fs /dev/sda1

The command above would resize to the maximum permitted.

In your case I think your right in adding the -p (I’m assuming that switch is for persistent as it’s a technically a virtual drive)

so sudo resize2fs -p /dev/sda1 should work if we assume that your running the command directly on the ubuntu machine

6 
sudo cfdisk /dev/sda

command I think your referring to IIRC deletes the partition and recreates it you should be able to just run the sudo resize2fs -p /dev/sda1 cmd

7

I had to resize the disk by:

  1. cfdisk /dev/sda
    ->select the respective partition (here sda1)
    → increase size (see red box in the screenshot)

  2. resize2fs -p /dev/sda1

Worked well, however I sweat a lot. :slight_smile:

Oh, by the way - it was an ext4 file system. I unmounted the file system (it was just media), but it would have been possible during operation, too.

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