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Almost all servers purchased today come preinstalled with one or more gigabit network connections offering roughly 10 to 100 times the bandwidth of previous generations. The speed of the network card is only as good as the switch port it s connected to. It s common for SQL Servers with gigabit network cards to be connected to 100Mbps switch ports. Gigabit switches should be used where possible, particularly at the server level between database and application servers. In smaller networks, it s not uncommon for hubs to be used instead of switches. Hubs broadcast traffic to all network nodes. In contrast, switches intelligently route traffic as required, and should be used to reduce overall network traffic.

Apart from DAS, lower-cost alternatives to Fibre Channel SANs include network-attached storage (NAS) and iSCSI. NAS systems aren t recommended for use with SQL Server as some of them can t guarantee the write ordering that SQL Server requires in maintaining data integrity. Internet SCSI (iSCSI) SANs are recommended instead of NAS.

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Computer equipment repairers, also called field service engineers, perform a variety of tasks for the company They are trained electronics technicians who install, make routine adjustments to, diagnose problems with, repair, and make modifications to systems Computer equipment repairers are responsible for preventative and corrective maintenance of the equipment such as replacing defective components and wiring, testing equipment, making adjustments, and working with operators to diagnose problems Minimizing downtime once a customer s system is installed is a critical part of their job because downtime is very expensive Working directly with customers requires interpersonal skills as well as the technical skills required to solve tricky problems Computer equipment repairers or field engineers assist sales and support personnel in preparing the engineering portion of their presentations to customers They work directly with hardware and software design groups and with manufacturing and engineering staff to test, troubleshoot, and debug equipment and software Field service representatives have at least two years of technical training, and some hold engineering or computer science degrees Levels of experience include junior field service rep with little experience, associate field service rep with one to three years of experience, field service rep with three to six years of experience, and senior field service rep with more than five years of experience Promotion to field service manager or supervisor involves the responsibility for overseeing a staff of field engineers Demand for computer equipment repairers is expected to grow by 4,860 annual job openings between 1998 and 2008, an increase of 47 percent, according to Occupational Employment Statistics Large concentrations of workers in this area are found in wholesale and retail trade and business services as well as in the computer industry itself

iSCSI is the name given to a network protocol that carries SCSI commands over a TCP/IP network. iSCSI SANs are similar to Fibre Channel SANs in that they re independent of the servers connected to them. Unlike a Fibre Channel SAN, servers connect to iSCSI systems over a standard TCP/IP infrastructure. Best practice dictates connecting servers to the iSCSI SAN over a dedicated 1- or

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10GB network physically separate from the main network This involves dedicated switches and servers with multiple network cards, or separate iSCSI HBA cards, to connect to both the public network and the dedicated iSCSI network The physical separation of networks enables the best I/O performance and reliability Further, the connections to the iSCSI SAN should ideally be set up using dual network cards in a teaming arrangement We ll cover NIC teaming in the next chapter Given the TCP/IP-centric nature of iSCSI, the components required to connect servers to iSCSI SANs are typically less expensive than the components used for Fibre Channel SANs Standard network cards can be used to connect to the iSCSI SAN with software components (such as the Microsoft iSCSI Software Initiator), enabling the iSCSI support.

Alternatively, dedicated iSCSI HBA cards can be used to offload iSCSI processing from the CPU and improve I/O throughput while reducing system overhead iSCSI SANs are becoming increasingly popular due to the lower cost of entry compared to the Fibre alternative, and the ease with which a storage network can be established You ll see an example of this in chapter 5 when we take a look at the installation of a SQL Server failover cluster The systems used for this installation are all virtualized, including a virtualized iSCSI host server Both cluster nodes use the host for storage purposes via Rocket Division s StarWind iSCSI software Table 22 compares and contrasts the features and attributes of the three storage systems we ve just covered TCO (total cost of ownership) assumes a medium-to-large data center.

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