OS drive failure is one of the critical failures when a node becomes fully inaccessible. Since Proxmox stores all cluster-related configuration files on Proxmox Cluster file system (pmxcfs), no cluster data is lost even when the OS drive fails completely. Refer to Chapter 3, Proxmox under the Hood, to recap details on pmxcfs. There are mainly two types of OS drive failure:
- Physical drive failure
- OS data corruption
This failure occurs when the physical drive itself becomes completely unusable or defective. In this scenario, the only option is to replace the damaged drive with a new one and install clean Proxmox VE on it. One way to prevent downtime due to physical drive failure is to use two physical drives for the OS in mirror mode. During Proxmox installation, we can select the Advanced
option to create a ZFS mirror on two physical drives. This way when one drive becomes physically damaged, it does not cause any downtime since there is...