Online RootFS growth
On growth-enabled images, Sandbox0 automatically expands the writable RootFS as free space runs low, within a configured sparse logical ceiling up to 64 TiB. Agent processes keep running. Growth is enabled in the qualified Cloud region; confirm activation for other regions. Existing images and snapshots retain their captured storage geometry. The ceiling is logical capacity, not preallocated host disk.
Google Persistent Disk already supports explicit online enlargement up to 64 TiB for supported disk types, with image-specific filesystem expansion. Sandbox0’s distinction is automatic free-space-triggered growth of an enabled durable writable RootFS, with deployment and captured-geometry qualifications.