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Part II
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A Closer Look
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Fibre Channel SAN
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Historically, the most common and widely deployed SAN has been the Fibre Channel SAN. For blade servers, attaching to an FC SAN requires the addition of a Fibre Channel host bus adapter (HBA) I/O expansion adapter (daughter card) on each blade that will access the SAN. Most of these FC I/O expansion adapters contain two ports for redundancy. These cards come in performance levels of 1Gbps, 2Gbps, and most recently 4 Gbps. Then, on the back side of the blade chassis, either Fibre Channel switch modules or pass-through modules (copper or optical) will be needed (see Figure 7.3) to complete the connection from the blade to the external SAN.
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As discussed previously, with the standard Ethernet connectivity and a software initiator (usually free), customers can configure and access iSCSI SAN storage using the iSCSI protocol, also called an IP-SAN. The iSCSI protocol is the SCSI protocol, which is typically used to access storage, encapsulated into IP packets so it can be transmitted to storage via a LAN, or even a WAN, over TCP/IP. On the storage side, there must be either a bridge or iSCSI storage that knows how to extract the SCSI commands from the IP packets and perform the tasks.
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With the availability of 10Gbps Ethernet, users are questioning the need to implement yet another network for their storage, especially if they are moving to blade systems. Why not just use Ethernet This is a question worth exploring. Several storage protocols use TCP/IP over Ethernet. Two that are addressed in this book are the NAS (NFS and CIFS) and iSCSI protocols. The arguments against using TCP/IP as a storage network protocol involve guaranteeing reliable performance using this chatty network protocol, especially if your applications require a great deal of I/O. What if your TCP/IP network becomes overloaded and I/O requests can t be serviced Most applications do not deal with I/O timeouts or dropped requests very well, even with the advent of SANs. One typical way to get around this is to isolate your storage network from your communications network something you would be doing by default if you were to implement a Fibre Channel SAN. Another aspect of TCP/IP that is less than optimal is that it is most often processed in software as part of the operating system. It is not unheard of for an I/O-intensive application to consume as much as 80% of the CPU in TCP/IP processing only. Obviously, it would be better to have the CPU working on business-related activities rather than OS activities. To address this, TCP Offload Engines (TOEs) implement the TCP/IP protocol in hardware and are placed on NICs. This makes for very efficient and fast processing of all network traffic, including NAS and iSCSI storage traffic.
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In a blade environment, TOEs are implemented as daughter cards and can be added just as another NIC would be, by connecting it to the I/O expansion adapter on the blade. If you plan to connect blades to an existing SAN, either FC or iSCSI, or if you choose to implement your SAN using specific switches and storage, it is important for you to check with your vendors to verify that the blade I/O expansion adapters and switch modules are interoperable with their hardware.
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Storage Implementation Considerations
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The best way to implement storage with one or many blade systems is highly dependent upon your business goals. This section explains the trade-offs in many of the implementation decisions you will face.
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It s not often you will find a traditional server with no onboard storage, even if it is used only to boot the system. However, with blade servers, there are a number of arguments for using diskless (also called anonymous or stateless) blades:
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