The IBM eServer BladeCenter is a key component in building your IBM eServer blades configuration. Its innovative 7U modular design delivers the performance density and reliability for adding scale and capacity in rack-optimized server infrastructures. And its flexible design can help dramatically lower the deployment costs of adding business-critical application capacity in centralized IT environments. The rack-optimized BladeCenter holds up to 14 hot-swap HS20 blades with up to six enclosures in a 42U rack. Its breakthrough chassis design provides redundant and hot-swap components, helping ensure maximum uptime by eliminating single points of failure.This BladeCenter chassis comes with 4x Cisco Systems Intelligent GB Ethernet switch module.