Final answer:
Offline P2V migrations are necessary for servers with FAT32 volumes and servers that are domain controllers. FAT32 is an older file system, and domain controllers have roles that could cause network issues if migrated online. Other server types like those with NTFS volumes or VSS writers can often be migrated online or offline.
Step-by-step explanation:
Offline Physical-to-Virtual (P2V) migrations are the only migration method for certain types of source servers. Specifically, offline P2V migrations are necessary when dealing with:
- Servers with FAT32 volumes: Due to the older file system that may not be supported by online migration tools.
- Servers that are domain controllers: These servers have special roles within a network, and migrating them while online could cause complicated issues with network stability and security.
Servers with NTFS volumes and servers with any VSS writers installed are not exclusively restricted to offline P2V migrations. These type of servers can also often be migrated online, depending on the specific migration tool and scenario.
In summary, when you are dealing with a server that has FAT32 volumes or is a domain controller, an offline P2V migration is typically the only method available due to the complexity and potential issues that might arise from an online migration.