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Definition


BLADE SERVER

Posted by: Margaret Rouse
WhatIs.com

Contributor(s): Laura Fitzgibbons and Sonia Weaver

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A blade server, sometimes referred to as a high-density server, is a compact
device containing a computer used to manage and distribute data in a collection
of computers and systems, called a network. Its role is to act as a conduit
between computers, programs, applications and systems.



In general, a blade server consists of a chassis, or box-like structure, housing
multiple thin, modular electronic circuit boards, known as server blades. They
are called blades because of their ultra-thin shape. Each blade contains a
single server, often dedicated to a single application. The information within
blade servers is stored on a memory card or other memory device. In addition,
the individual blades contain processors, memory, integrated network
controllers, an optional Fibre Channel host bus adaptor (HBA) and other
input/output (IO) ports. These are used to connect server blades to other server
blade units within the system, or to connect individual blades to power sources.


BENEFITS OF BLADE SERVERS

Because most blade servers are dedicated, meaning they are focused on a single
use application, professionals have more control over how they are accessed and
used, and how data is transferred between devices. Some of the benefits of blade
servers compared to their traditional predecessors include:

 * Cooling: Each blade is cooled individually by fans. Additionally, because of
   their stackability, the servers can be kept in smaller air-controlled areas
   that keep all of the mechanical parts at a proper temperature.
 * Management supervisor included: Unlike their predecessors, blade servers can
   be controlled and managed in tandem with other server units within a data
   center or network. The administrator of a stack of blade servers is able to
   balance the workloads spread over many individual server devices. 
 * Seamless movement within rack and minimal wiring: Organizations using blade
   servers can experience a reduction in cabling for blade server housing
   compared to larger models like box servers. Because the design is modular and
   compact, individual units can easily be transferred within or between
   systems. With less cables and parts to deal with, IT administrators and other
   professionals can spend less time managing the infrastructure of their data
   center and more time ensuring high availability, which is the maximization of
   how well the servers perform even after failure.
 * Low power consumption: Servers within a rack are able to share a single power
   source, leading to a reduction in storage and power consumption costs
   compared to other server types. In addition, the compact nature of blade
   servers causes them to need very little power. This decrease in power
   consumption allows teams to maximize the efficiency of their space.
 * Storage consolidation: Each blade in a blade server typically comes with one
   or two local ATA or SCSI For additional storage, blade servers can connect to
   a storage pool facilitated by a network-attached storage (NAS), Fiber
   Channel, or iSCSI storage-area network (SAN). The advantage of blade servers
   comes not only from the consolidation benefits of housing several servers in
   a single chassis, but also from the consolidation of associated resources
   (for instance, storage and networking equipment) into smaller architecture
   that can be managed through a single interface.
 * Compact size: Unlike traditional rack servers, blade computing does not have
   minimum size restrictions. Because blade servers are made up of the smallest
   number of components required to a device to be considered a computer, they
   are able to fit in small, tight spaces and run well with other simplified
   servers as part of a larger overall structure.
 * High-trust compatibility: The nature of servers that carry out a highly
   individualized task makes it possible for an organization to dedicate a
   single server entirely to mission-critical applications, or programs without
   which the entire company or project could not exist. 


USES OF BLADE SERVERS

To maximize their efficiency, blade servers are often dedicated to single-task
functionality. Some example of tasks a server may perform include:

 * File sharing: Any transfer of data between digital points or devices.
 * Web page serving and caching: The processes of delivering web pages to
   visitors and temporarily storing the information on the website on the
   visitor's computer so it can be quickly pulled up and recalled in order to
   reduce wait time and stalling. 
 * SSL encryption of web communication: Ensuring that information that travels
   over an internet connection is secure from outside parties, viruses and
   attackers. 
 * Transcoding: Converting the code of web page content to move seamlessly
   between differently-sized and shaped devices or for other conversion
   purposes. 
 * Streaming: Transmitting audio and video content without interruption to allow
   viewing and listening in real time. 
 * Load balancing: Like most clustering applications, blade servers can be used
   to include load balancing and failover
 * Virtualization: Blade servers can be used to create abstract versions of
   applications or real-life activities for digital use.
 * Storage: The sleeker, more compact design allows a larger amount of
   information to be stored to support a larger number of applications working
   in unison.


DIFFERENCE BETWEEN BLADE SERVERS AND RACK-MOUNTED SERVERS

Blade servers and rack servers are two common features of data centers and while
very similar, they have some significant differences. Typically, rack servers,
also known as rack-mounted servers, are created to fit vertically within a
shelf-like structure called a rack, typically housed in a data center or server
room. They are ideal for projects with low CPU requirements or small amounts of
physical space.



The number of servers stacked within a rack-mounted system is completely
variable based on the size and extent of an organization's project needs. Rack
servers are fully equipped to work as a stand-alone computer and are able to run
multiple, complex applications and processes, using powerful memory and CPU
resources. Their modularity and configurability make them convenient to assemble
and store. Without the need for a large chassis to hold the servers, the
rack-mounted servers are ideal for projects that require a small number of
servers between, for instance, two and ten.

Blade server technology is very similar to rack-mounted server technology. Blade
servers, much like rack-mounted servers, are usually stored in a vertical stack
in a data center or server room, though they tend to appear in much larger data
centers for projects with higher power needs. One key difference is that the
individual servers are highly stripped-down, with simple, sometimes singular
functionality. This allows for multiple small, flat, horizontal blades
containing individual servers to be stored within a chassis and stacked
vertically. Unlike rack servers, blade servers generally do not function as
stand-alone servers--they work best when placed with others in a chassis and
combined into a blade service stack.

Another major difference is that each individual server is typically dedicated
only to a single application, as it generally only contains CPUs, controllers
and memory. Blade server systems are much easier to fix than larger rack-mounted
servers because the modular parts can be repaired individually without
disrupting the larger system--in other words they can be hot-swapped. Companies
need to be proactive researching the company that makes the blade server model
they purchase for the organization. When a company chooses a specific model of
blade servers, they need to prepare for the possibilities of vendor lock-in, so
switching between products is costly as it involves a complete overhaul of all
the available equipment. Blade servers also require fewer wires and cables than
typical stack-mounted servers, and are powerful processors compared to the space
they occupy.


HISTORY OF BLADE SERVERS

The first servers were offered in the 1990s and soon after there was a need for
dedicated servers, especially in industries with privacy and data safety
requirements, such as healthcare. Over time they became more widely used in
other industries, especially as security threats and viruses continued to
evolve. The need for smaller, more compact and faster servers increased with
each new company and technology. 

Blade servers were invented in the 2000s by Christopher Hipp and David Kirkeby
at their company, RLX Technologies in Houston. Both Christopher Hipp and David
Kirkeby were former employees of Compaq, one of the early companies to sell
computers and computer products. Hipp was an entrepreneur and inventor who was
especially interested in the advancements of graphic design as technology
improved. Kirkeby was his co-worker who helped to invent the patent for the
blade server. 

They created the first commercial blade server in 2001 to meet an industry need
for more compact and efficient data storage technology. Eventually the blade
server design was acquired and manufactured by Hewlett Packard and other
companies. 
In its original format, all parts of the blades could be hot plugged and fit
into a modular design. Servers with a similar design were also sometimes
referred to as space-saving servers. 


TYPES OF BLADE SERVERS

Blade servers are categorized by type based on various traits, such as differing
CPUs, amount of RAM and cache memory or connections.

Blade servers can be equipped with different central processing units such as
Intel, Advanced Micro Devices (AMD), Motorola and Sun Microsystems. The CPU does
the processing and computing for the entire system, and the more powerful the
central processing unit, the more functionality the computer system is able to
perform at a given time.

A blade server can also contain a wide variety of memory systems. The first is
static RAM (SRAM), one of the earlier forms of storing information common in
digital cameras and printers that stores data exactly as it is. Another is
dynamic RAM (DRAM), a form of storage that updates as it works and is common in
more complex systems like video game consoles. Lastly is double data rate
synchronous dynamic random access memory (DDR SDRAM), most commonly used in
servers and computers with a great deal of visual content. RAM is used to manage
and store information and complete processing and calculations in real time. 

While blade servers have a modular and uniform design that makes them easy to
move between data centers, they can have a variety of outer connectors. For
example, they may be equipped with an Ethernet output, a token ring, a fiber
channel which can be up to 6 miles long or a fieldbus network protocol.

Additionally, blade servers may be connected to different storage connection
methods, including the following: 

 * FireWire: FireWire is a type of port often used to connect digital cameras,
   external hard disk drives, phones, tablets and devices that require the use
   of high transfer rates. A FireWire connection can support up to 480 Mbps
   connection speeds.
 * SATA: A SATA connection, or Serial AT Attachment connection, is a bus-style
   port that connects host bus adapters to hard drives, solid-state drives or
   other larger storage devices.
 * SCSI: A small computer system interface connection is used to connect
   computer parts in a SCSI system and create ports of communication between
   them. 
 * DAS: Directed attached storage is within a computer itself, or directly
   connected to it, and is not part of an external storage network system. A
   common example is the internal hard drive of a computer or laptop.
 * FC: An FC connection, or fiber channel storage area network (FC SAN) storage
   connection that allows network storage devices to share information with
   servers at high speeds with high performance. 
 * iSCSI: An iSCSI connection, or internet small computer system interface, is a
   storage connection based on IP and includes a storage system that is used to
   link various network storage locations within the same server system.


PARTS OF A BLADE SERVER TECHNOLOGY SYSTEM

The basic parts of a blade server system include:

 * A chassis- The outer case of one or more blade servers used to store all of
   the mechanical parts. Usually small and compact in shape.  
 * Blades- Small mechanical parts that hold servers and contain the memory
   systems to store data and serve information to the computer systems in a
   network. Sometimes shaped like super thin drawers stacked on top of other
   blades.
 * Servers- The servers within the individual blades in blade server technology
   are housed within the chassis and contain all of the memory, processors and
   programs to carry out the individualized function they are designed to
   complete.
 * Racks- Commonly used to store many individual blade servers in a physical
   location like a server room.
 * A backplane- The area of a sever rack that connects all of the individual
   modules and servers via circuitry, including sockets, plugs, wires, switches
   and circuit boards.


FUTURE OF BLADE SERVERS

While blade servers are a highly common aspect of many business server rooms,
there are other technologies that may replace their commonality. Brick servers,
which unlike a blade server do not require a chassis outer container, have many
of the benefits of compactness and compatibility, while taking up even less
space. Similarly, cartridge servers are small like printer cartridges and
commonly used in various industries. In addition, modular hybrid servers address
some issues with hard-wired connections, temperature management and ease of
movement within a server system. As power consumption and thermal design power
(TDP) increase with ever-improving technologies, the demand for servers that can
be stored seamlessly and easily cooled continues to grow.

Margaret Rouse asks:


WHAT SHOULD YOUR ORGANIZATION CONSIDER WHEN CHOOSING A BLADE SERVER MODEL AND
BRAND TO AVOID WASTE DOWN THE ROAD?

Join the Discussion

This was last updated in September 2019

CONTINUE READING ABOUT BLADE SERVER

 * Compare blade servers vs. rack servers

 * How do I integrate storage into a blade server architecture?

 * How are rack and blade server form factors different?

 * A rundown of server hardware vendors and the server options

 * Upgrade considerations for a blade server vs. rack server



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Margaret Rouse - 6 Feb 2008 3:27 AM
What should your organization consider when choosing a blade server model and
brand to avoid waste down the road?

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kamalmarwi - 23 Nov 2015 5:24 AM
Why does the blade system failover unable to take over when the recording server
fail

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