Which of the following is NOT a condition that prevents expanding virtual volumes?

Expanding virtual volumes in a VPLEX environment is subject to specific conditions that can prevent the operation from occurring. The correct answer, indicating that a volume belonging to a separate data center does not inherently prevent expansion, highlights an important aspect of VPLEX architecture.

In a VPLEX system, virtual volumes can be located across different data centers and still allow for operations like expansion, since the technology is designed to handle distributed storage and provide a virtualized view of those volumes. The capability for replication and management across sites demonstrates the flexibility of VPLEX in multi-site environments.

Conversely, conditions such as an ongoing migration or rebuild process, or upgrades, directly interfere with volume modifications and thus would indeed restrict the ability to expand a volume. A metavolume consists of other virtual volumes and typically requires different handling during operations since its management is more complex. Therefore, both migration/rebuild and upgrade processes impose restrictions on expansion due to the activities taking place that could impact data integrity or consistency during those times.

Understanding these conditions helps in effectively managing virtual volumes within a VPLEX system and ensuring operational efficiency without compromising data availability or performance.