I resized disk to 3TB and according to google it is limited to 2TB

[sta...@gmail.com]

Hi,

I resized disk to 3TB and according to google it is limited to 2TB, what am I supposed to do? Can it go beyond 2TB? if not how do I contact them to fix the issue? Am I going to pay for that 3TB?

[Germán (Google Cloud Support)]

Because boot disks use MBR partitions, 2 TB is the limit [1]. If you resized to 3TB, resize it down to 2TB as explained at [2]

[1]https://cloud.google.com/compute/docs/disks/add-persistent-disk#resize_partitions
[2]https://cloud.google.com/compute/docs/disks/add-persistent-disk#resize_pd

[sta...@gmail.com]

ERROR: (gcloud.compute.disks.resize) Could not fetch resource: - Invalid value for field 'sizeGb': '2000'. New disk size '2000' GiB must be larger than existing size '3000' GiB.

Is this for real? Any one knows how to reduce the size if I accidentally resized disk to 3TB with MBR file system?

I'm going to be billed 400$ for no use at all.

[Fady (Google Cloud Platform)]

Yes, you are correct. As per the same document, and this gcloud reference document, you can only resize up. Thus, reducing the size of the disk is not possible. Furthermore, trying to create a smaller disk from a snapshot of the existing disk is also not possible. The only way that you can reduce the size of a disk is through creating a new one with the desired size, and copy over your data ( e.g block by block). I found this stackoverflow post that may help.

As for cost concerns, and as per this document, standard provisioned persistent disk space can start from $0.040/GB/month (US), and the maximum cost is in Sao Paulo $0.060/GB/Month, and equivalent to $60/TB/Month. While the cost of a regional standard provisioned disk space can be up to $0.104/GB/month (Tokyo), and that's $104/TB/Month. However, this is prorated “based on a granularity of seconds”.

As per the same document “based off US pricing, a 200 GB standard persistent disk volume would cost $8.00 for the whole month. If you only provisioned a 200 GB volume for half a month, it would cost $4.00.”  

That said, and since it is prorated, you may start the copy-over as to reduce the cost ( e.g now being charged $2/TB/day if standard in Sao Paulo).  

I hope this helps, and sorry about the confusion.