w 6500 switch chassis Slot1 WS-X6748-GE-TX 48 Port 10/100/1000 FE Blade 367.50 1,255.01 Slot2 WS-X6748-GE-TX 48 Port 10/100/1000 FE Blade 367.50 1,255.01 Slot3 WS-X6748-GE-TX 48 Port 10/100/1000 FE Blade 367.50 1,255.01 Slot4 WS-X6748-GE-TX 48 Port 10/100/1000 FE Blade 367.50 1,255.01 Slot5 VS-S720-10G-3C VSS Supervisor - 720 Fabric Enabled 422.63 1,443.26 Slot6 VS-S720-10G-3C VSS Supervisor - 720 Fabric Enabled 422.63 1,443.26 Slot7 WS-SVC-FWM-1-K9 214.73 733.29 Slot8 WS-X6708-10G-3C 8-port 10G Ethernet Module 555.45 1,896.86 Slot9 WS-X6748-GE-TX 48 Port 10/100/1000 FE Blade 367.50 1,255.01 MSFC Mem Upgrade MEM-MSFC2-512MB MSFC 512M DRAM Sup Mem Upgrade MEM-S2-512MB Sup 512M DRAM Flash Mem Upgrade MEM-C6K-CPTFL512M 512M Compact Flash Upgrade 302.00 1,031.00 Fan Tray WS-C6509-V-E-FAN Fan Tray Cable Management WS-C6509-V-E-CM Cable Management for 6509 V-E Chassis PS #1 WS-CAC-3000W-US 6000W Power Supply PS #2 WS-CAC-3000W-US/2 6000W Power Supply Totals 3,754.94 12,822.72 Figure 35-7. Power and BTU values for a 6509-V-E Remember that there will be limits on how many devices can be placed in a rack. In the first edition of this book, I showed how you may not be able to fit more than ten to twelve 1 RU servers in a rack due to power and cooling limitations. In the time since the first edition was published, virtualization and blade servers have both caught on in a big way. This has led many enterprises to adopt them, which has radically changed the way we build racks. Where we used to try to cram as many servers as possible into a rack, we now try to cram as many virtual servers as possible into as many blades as possible, all within a single blade enclosure. This has a drastic effect on the way we design racks, mostly because of the massive power and cooling requirements these blade servers have. Many times, we can only fit one blade chassis in a rack because of power and cooling limita- tions. These enclosures often only consume a quarter to a third of the rack, leaving significant amount of unused physical space. 