Root persistent disk and non-root persistent disk in google cloud persistent disks

Question

In GCP I came across creating disks and attaching them to a VM. There are two terms:

1. root persistent disks

2. non-root persistent disks

According to my understanding:

root persistent disks contain the OS images and these can be used (boot files)

non-root persistent disks are created such that applications use them for their operational purposes

If I mount the same root persistent disk to two different VMs, and after that if I make modifications to the system files in root persistent disk and reboot both the VMs, does the changes get applied in both of the VMs?

Answer 1

You can't attach one root (boot) disk to more than one VM -- that's a 1-to-1 relationship.

You can create multiple VMs from the same image, but that creates copies of the image on independent disks.