Google Cloud 如何减少磁盘大小？

Question

I have an SDD disk of 200GB in Google Cloud, that I want to reduce to 50GB. Google Cloud Console, and per documentation, only allows me to increase disk size.

What solutions do I have to decrease disk size?

Answer 1

Only increasing disk size is supported. Disks can be resized regardless of whether they are attached.

Read the following blog post for a solution to your problem. Google Compute Engine: Reducing the Size of a Persistent Disk

Answer 2

Updating the blog mentioned by @Thisara (as the options are outdated):

• Create a snapshot of the existing disk, so that you have a restore point.
• Create a new persistent disk of the desired target size, and add it to the existing VM as an Additional Disk. Restart the VM.
• Install weresync via a .deb package from the releases and install with eg

curl https://github.com/DonyorM/weresync/releases/download/v1.1.5/weresync_1.1.5-1_all.deb && apt install <PATH_TO_FILE>.deb

available at https://github.com/DonyorM/weresync/releases . This can help where eg the pip installation fails

• Then run the daemon:

sudo weresync-daemon > /dev/null 2>&1 &

• Then clone the disk, taking care of partitions. Eg after running lsblk one can see the partitions as below for this example from a Google Cloud VM instance:

sda       8:0    0    75G  0 disk 
├─sda1    8:1    0  74.9G  0 part /
├─sda14   8:14   0     4M  0 part 
└─sda15   8:15   0   106M  0 part /boot/efi
sdb
...

One might run:

weresync -C --root-partition 1 --efi-partition 15 /dev/sda /dev/sdb

Or in shorthand:

weresync -C -g 1 -E 15 /dev/sda /dev/sdb

• Then, stop the instance and remove the disk. Start a new instance with this disk as the new boot disk.
• I was successful in cloning a disk via this method, but was unable to connect to the new VM via SSH. I suspect that there is an error related to mounting or fstab -https://cloud.google.com/compute/docs/disks/add-persistent-disk . Please comment if you manage to figure it out.

Answer 3

You can't reduce the size of a persistent disk. See google compute docs below.

https://cloud.google.com/compute/docs/disks/working-with-persistent-disks?authuser=6#resize_pd

Answer 4

Here is answer for anyone else that is trying to downsize the Boot Disk on a Google Cloud VM. I tried many other solutions with no luck.

• Create a disk from an image, in my case I used Ubuntu. This partitions the disk and marks the disk as bootable.

• Add the disk to your VM with the Boot Disk you are wanting to resize.

• Run lsblk to confirm the new disk location in my case it looked like:

• For me, sda was my primary Boot Disk (2.5T) and I wanted to shrink it to sdf (500G)

• I installed 'weresync' with 'apt get' started the daemon, and ran:

  sudo weresync -C -g 1 -E 1 -B 15 /dev/sda /dev/sdf

• I still received several errors from weresync but continued.

• Remove the 500G drive from your VM and use the new Boot Disk with the exiting VM instance, or create a new instance. This was the only way I was able to ssh into the new copied disk instance and boot successfully.