is a Cisco NX-OS software image for Nexus switches (64-bit control- and data-plane builds). The naming breaks down as:

The image size is approximately 800–950 MB. Ensure your switch’s bootflash has at least (to accommodate the new image + upgrade logs + backup).

: If upgrading from an older version (e.g., 9.x) to a much newer one (e.g., 10.3 or higher), users may need to use an interim release like 10.2(3)F as a "hop". Known Issues