December 2002
Intermediate to advanced
260 pages
9h 18m
English
Content preview from Managing RAID on Linux
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An Organizational Overview
All systems are built around a motherboard. The motherboard integrates all the components of a computer by providing a means through which processors, memory, peripherals, and user devices (monitors, keyboards, and mice) can communicate. Specialized system controllers facilitate communication between these devices. This group of controllers is often referred to as the motherboard’s chipset. In addition to facilitating communication, the chipset also determines factors that affect system expandability, such as maximum memory capacity and processor speed.
When an application needs data, the CPU first checks to see if the data is stored in memory. If the data is no longer in memory, the CPU asks the chipset to request the information from disk. The chipset sends a request to the data bus, where it is picked up by the appropriate disk controller and sent across the disk bus to the drive containing the data. The drive sends the information back to the controller card, which in turn passes it back to the CPU and main memory. Figure 2-15 illustrates the connections between various components of a modern PCI motherboard.
Figure 2-15. When disk I/O occurs, data travels over both the data bus and
the disk bus, each a potential bottleneck.
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