A MySQL warehouse runs on Debian in an n1-standard-8 with an 80 GB SSD persistent disk and needs better I/O performance. Which change will improve performance?

Increasing the SSD persistent disk size to 500 GB will improve I/O performance. For Persistent Disks on Google Cloud, both IOPS (Input/Output Operations Per Second) and throughput scale with disk size. A larger disk provides a higher maximum IOPS and throughput, directly addressing the need for better I/O performance. Increasing the VM's memory might help with caching but doesn't directly improve disk I/O limits. Creating a new VM with PostgreSQL or migrating to BigQuery are significant architectural changes, not simple performance improvements for the existing MySQL instance. Modifying batch jobs for bulk inserts is an application-level optimization, which can help, but doesn't address the underlying disk I/O bottleneck.