I need to do a large upload ~1.5TB to Google Cloud Storage coldline. I was intending on using gsutil's rsync command. But I have a concern. Will the checksum validation of rsync incur additional charges per object in a Coldline bucket. I have tried to ascertain this but cannot find the information anywhere. If anyone else had experienced this, I'd appreciate the information.
The hash validation is included at the end of the copy operation. It is also documented that you will be charge by the type of operation. The copy operation is a Class A operation.
So, no. There will be no further charges on the checksum validation if it is made by server side at the end of the copy command because you were already charged for the operation of copy.
If you decide to do it yourself, well, you will have to download metadata and this could incur in more operations.
Still, take a look at the pricing page of Cloud Storage, you may also be charged for Retrieval and early deletion of Nearline and Coldline.