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What Are Blades
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Blades are a new form factor for computer technology, which packages ultrahigh density components including servers, storage, and communications
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interfaces in a prewired chassis with shared components such as power, cooling, and networking. In contrast to the traditional horizontal positioning within a rack (rack-mounted servers), blades are typically (though not always) installed vertically in a blade chassis, like books in a bookshelf. In addition to the high density, prewiring, and shared components, an important differentiator between blades and conventional servers is the incorporation of remote out-of-band manageability as an integral part of each blade device. This is fundamentally different from conventional servers (rackmount or stand-alone) where systems management has been designed as an add-on capability. The blade approach shown in Figure 1.1 offers considerable space savings over rack-mounted (1U) servers. For example, 60 blade servers can fit in the same physical space as 42 rack-mounted servers.
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Figure 1.1: Example of blades in a chassis
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Server Blades and PC Blades
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Most of the buzz about blades has focused on blade servers as an upgraded alternative to rack-mounted server farms. When one is implementing blade technology, blade servers are generally the starting point. However, there are other types of blades.
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Blades and Virtualization
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In addition to building servers on blades, a number of vendors have delivered PC blade products. In a PC blade implementation, end users operate with only a monitor, a keyboard, and a mouse (and/or in some cases a specialized client device), and the PC runs on a central blade. PC blades offer the ability to recentralize certain aspects of distributed computing. They offer improvements in physical security and manageability by locating the actual compute and storage components in a central location, allowing easy access for IT as well as centralized maintenance and management while providing a desktop environment for the end user, similar to having a local PC.
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Storage and Network Blades
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Blade technology also extends to other components of computing, including storage and networking. Since blade servers require access to information, the choice is whether to incorporate storage on the blade server itself, utilize storage or networking protocols to communicate with standard storage devices outside of the blade environment, or utilize storage blades. All of these options have pros and cons, of course, to be discussed in depth later in the book. The same issues and options are true for general networking requirements. As blades have become more popular, networking vendors have seen the opportunity, and network modules (sometimes called switch blades) for both IP and Fibre Channel networks are available for blade server systems from multiple vendors.
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Why Blades
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Since their introduction in 2001, blade systems have gained significant traction in the enterprise space. Reasons for implementing blade systems versus rackmounted servers will be discussed in detail later, but here is a summary:
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Space savings and efficiency packing more computing power into a smaller area Consolidation of servers to improve and centralize management as well as to improve utilization of computer assets Simplification and reduction of complexity (modularity, ease of integration, prewired configurations, shared components), ease of deployment, and improved manageability and serviceability Return on investment (ROI) and improved total cost of ownership (TCO) through increased hardware utilization and reduced operating expenses (OpEx)
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What Is Virtualization
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Virtualization is the ability to create a logical abstraction of physical assets. In the case of server virtualization, it allows for multiple virtual servers to run on one physical server, thereby consolidating many physical servers onto one. There are several approaches to server virtualization, which will be discussed in detail later in the book.
Why Virtualization
Since server virtualization allows multiple virtual servers to run on one physical server, by its nature it consolidates servers and applications. This increases server utilization and helps address the problem of server sprawl. A Gartner Survey in 2005 showed that 60% of users surveyed had consolidation projects underway, and an additional 28% were looking into it. Cost-reduction pressure, very low server-utilization rates (often under 5%), and the need for improved management have been key drivers. Reduction in the number of servers from virtualization yields direct savings in hardware, power and cooling, and floor space, reducing both capital expenses (CapEx) and ongoing OpEx. In addition, the ease of deployment of virtual machines and advanced management capabilities in the virtualized environment contribute to reduced OpEx.