Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)

LOOK UP ANOTHER TERM


blade PC

A PC architecture that houses multiple PC modules ("blades") in a single chassis. It takes the machines off the users' desks and houses them in rack mounted cabinets in the datacenter similar to blade servers (see blade server). The user's keyboard, monitor and mouse plug into a device at the desk that is wired via a TCP/IP or direct connection to the assigned blade in the datacenter.

More Security and Flexibility
Having the physical PCs in the datacenter reduces noise and heat at users' desks and takes advantage of the inherent security in a locked room. PCs cannot be pilfered from cubicles, and data cannot be uploaded or downloaded because there is no access to USB ports and drives.

Instead of a hardware relocation, moving a user to a new station requires only an adjustment to the management software. If a PC fails, a spare blade may be available in each chassis for hot swapping, which is also a software function. In addition, repairs are always performed in the same place, and technicians do not have to travel throughout the building.




Eight Blade PCs
This ClearCube cage contains eight fully functional PCs, each with its own storage. A six-foot rack can hold 112 PCs. ClearCube was the first to make blade PCs, which were introduced in 2000. ClearCube management software backs up the data to spare network drives, and if a blade fails, the software is used to switch the user to a spare blade and restore the data. (Image courtesy of ClearCube Technology, Inc., www.clearcube.com)






blade server

A server architecture that houses multiple server modules ("blades") in a single chassis. It is widely used in datacenters to save space and improve system management. Either self-standing or rack mounted, the chassis provides the power supply, and each blade has its own CPU, RAM and storage. Redundant power supplies may be an option. Blade servers generally provide their own management systems and may include a network or storage switch. Contrast with blade PC.

Diskless Blades
With enterprise-class blade servers, storage may be external, and the blades are diskless. This approach allows for more efficient failover because applications are not tied to specific hardware and a particular instance of the operating system. The blades are anonymous and interchangeable. In a hyperconverged datacenter architecture, the blade servers each have local storage (see hyperconverged infrastructure). See blade and processor area network.



Disk-Based Blades
Blade servers are widely used in datacenters to save space and ease systems management. This earlier ProLiant unit from HP has redundant power supplies and holds 20 blades in 3U of rack space. The exposed blade on the left is a complete server with hard disk. (Image courtesy of Hewlett-Packard Company.)







Enterprise-Class Blade Server
The BladeFrame from Egenera supports up to 24 blades, each with four Xeon processors. The entire system is managed with Egenera's PAN Manager software via a Web browser. In this picture, one blade is being replaced. (Image courtesy of Egenera, Inc., www.egenera.com)






Personal Use Only

Before/After Your Search Term
BeforeAfter
blackboardblade server
Blackboard Learning Systemblank character
Blackcombblank laptop
blackholeblank squash
blackholingblanket
blacklistBlaze Advisor
Blacklist of Internet AdvertisersBLE
blackoutBLEC
blacksurfingbleed
bladebleeding edge

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
Audio/VideoGraphics
MainframesSecurity
ProgrammingHealthcare IT
System design