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one that is receiving the replicated data, you can create a copy of the filesystem. Changes that are made to this snapshot are not permanent (they will be lost when the snapshot copy is destroyed, or updated with new changes from the primary), so even though the read-only nature of this copy may not be continuously enforced, it is certainly true.
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Wide area replication between two remote sites requires additional networking hardware from companies like CNT, Inrange, or Nishan Systems. These companies make the hardware that converts the replicated data into the appropriate format for replication across wide area networks. The disk array vendors rely on these companies to provide the wide area links between their arrays, as they do not provide this functionality themselves. One of the methods that these companies use is called dense wavelength division multiplexing (DWDM). We mention it mostly because it s very cool. DWDM takes data from multiple protocols, including Fibre Channel, FICON, ESCON, and Ethernet, and converts them into optical signals, which are sent across a fiber optic network as light. As shown in Figure 18.2 (that we wish could be in color), a DWDM converter takes each incoming channel, converts it into a different frequency of visible light (i.e. color), called a lambda, and merges the colors together into a single stream with a prism. The stream is then sent across the network at very nearly the speed of light (bends in the cable can cause reflections, which can slow the signal down slightly). The colors are then separated on the remote side by another prism and converted back into data, and the data is sent to the appropriate destination. The result is that a single strand of fiber optic cable can run many parallel data streams at very high throughput rates, each with its own color.
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Fibre Channel Gigabit Ethernet 10/100 Ethernet Fiber optic network ESCON FICON ATM SONET ESCON FICON ATM SONET Fibre Channel Gigabit Ethernet 10/100 Ethernet
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Figure 18.2 Multiple network protocols using DWDM on a common fiber optic cable.
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Data Replication
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Initiator-Based Type 2: Software-Based Replication
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Software-based replication is generally performed by volume management software, such as the extension to VERITAS Volume Manager, called VERITAS Volume Replicator (VVR). Software-based replication offers more flexibility than hardware-based replication, usually at a lower cost. The following are some of the advantages of software-based replication:
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There is no requirement for the disks to be a certain type or brand; the software replicates from its own logical volumes (as described in 7) to another system and its set of logical volumes. There is no requirement for a specialized network; a standard TCP/IP network is usually just fine. If you add software-based replication to an existing WAN, it is likely, however, that your network will see a rather substantial decline in performance and throughput due to the additional data traffic. Because of its open nature, software-based replication tends to be a less expensive solution than hardware-based solutions, especially when considered from end to end and including disk and network hardware. Surprisingly, benchmarks reveal that software-based replication tends to have far less impact on systems and applications than hardware solutions do. (More on this in Is Software Replication Really Faster .) There are no specialized hardware requirements for repeaters, protocol converters, or wide area networking hardware. Because of the way that hardware-based replication copies its data, generally you ll usually need to keep more copies of the data on separate sets of disks than you will with software-based replication, saving you money on hardware.
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One disadvantage to software-based RAID is that you can only replicate data between systems that support the software that does the replication. With hardware-based RAID, you could replicate data from your Amiga to a Palm OS PDA, as long as you can figure out how to connect those to the disk arrays.
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