Figure 7.2: Sample chassis I/O diagram in .NET

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Figure 7.2: Sample chassis I/O diagram
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Any blade within the chassis can access any switch module through the midplane, thereby building in redundant paths within the chassis. However, if you prefer not to use a switch module in the chassis (if you have enough available ports on an existing external switch; if you are using advanced features on your external switch that are not available on the equivalent blade switch; if you just don t want yet another, possibly unknown switch type in your environment; and so on), you can implement pass-through modules that allow you to connect the adapter on the blade out to the backplane for connection to an external switch (see Figure 7.3). Pass-through modules do simply that pass the traffic through without any processing. They can be thought of as a straight wire to the outside of the chassis.
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I/O expansion adapter (Ethernet, FC, or IB) PCI-X/PCI-E Blade subsystems
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Figure 7.3: Using pass-through modules
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Storage Options with Blade Servers
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At a high level, there are three ways to implement storage with blades, as with any server: onboard storage, external storage, and a combination of the two. More often that not, with traditional servers, businesses implement a combination of onboard storage to be used for system functions and external storage, either network-attached storage (NAS) or storage area network (SAN), for business-application data storage.
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The area inside a blade chassis is tight, so space is always a consideration. Most vendors allow up to two small form factor (SFF) 2.5-inch disk drives on their blades. A number of disk drive options are available in this form factor. The most frequently used onboard drives include SFF serial-attached SCSI
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(SAS) drives and SFF Serial ATA (SATA) drives, which are both hot-pluggable. The hot-pluggable feature is important because the disk drive is the only moving part on the blade and is more prone to failure. To minimize downtime due to disk failure, blade companies have started providing RAID (redundant arrays of independent disk) controllers that will stripe (for performance) and mirror (for redundancy) the data across the two disks. Many vendors also offer blade storage expansion units, which take up another blade slot that support a number of 3.5-inch HDDs as well as adapters for additional I/O daughter cards.
External Storage
External storage comes in a variety of configurations with a number of different protocols used for access. The two primary methods used are network attached storage (NAS) and storage area Nntworks (SAN).
Network Attached Storage (NAS)
With the standard Ethernet connectivity available on the blade, storage can be accessed using NAS protocols over IP. If the operating system running on the blade is Microsoft Windows, the CIFS protocol is generally used. Both Linux and UNIX operating systems use the NFS protocol. Of course, third-party software is available for each operating system to allow both file protocols in either environment. Through the NAS protocols, the blade can access, and even share, any files other systems have made available. More often than not, a special NAS storage solution is used for this purpose rather than an off-theshelf server with attached storage. In a NAS storage solution, the server component has been both stripped down and enhanced to excel at file-serving; its sole purpose is to send and receive files across the network.
Storage Area Network (SAN)
Since the late 1990s, SANs have gained vast acceptance and have been widely deployed to meet customer requirements for reliability, flexibility, scalability and availability of their data. SANs have allowed businesses to better manage and utilize their storage resources, providing consolidation of disk and tape storage into resource pools that can be shared by multiple servers. Rather than having storage connected to and managed independently by each blade, an entire chassis of blades, multiple chassis, or both chassis and traditional servers can share a pool of tape and disk storage, thereby consolidating and simplifying storage as well as servers.