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Cold Sites
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When discussing redundancy, it is important to explore the physical redundancy of the actual location where your equipment resides. Secondary locations are important for situations where there is a need to be back up and running quickly in the event of a communications error with your primary location. The secondary location, or cold site, often consists of a set of servers that are slightly below the speed of your primary site, that are shut down (or offline), and that contain a fairly recent copy of the data stored in your hot site. Planning is everything when dealing with a secondary location. Much like an evacuation procedure at an office, in the event of a failure at your primary site, a procedure should be written and followed to activate the cold site. These processes often resemble a series of steps that enable you to be online providing the assets that you need quickly and efficiently. An example of this might include a complex flowchart, or it might be as easy as a simple checklist outlining what steps to take. We cannot stress enough the importance of documenting and testing these missioncritical business processes before you begin to rely on them.
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CHAPTER 18: Backup and Fault Tolerance
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Hot Sites
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For locations that require even more redundancy and cannot suffer a performance loss should the primary site go down, a redundant site, or hot site, should be implemented. With a hot redundant site, practically a one-to-one ratio of your equipment in the primary location would be available in the secondary site. A hot site is critical for large web sites, such as Amazon.com and Expedia.com, which would lose millions of dollars an hour if users were unable to check the status of accounts, book travel, or purchase MP3s because of an outage. The goal of any hot site is not to quickly be up and running with a subpar system, as it is with a cold site, but instead to be instantly up and running with an equally powerful system. Many hot sites begin as a redundant location used only in an emergency and often end up running in tandem with various systems in the primary site, allowing any of the systems in the primary site to fail over to the secondary. This can lead to increased throughput capacity for server farms, which might otherwise be sitting idle.
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Backing up Services
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Finally, it s worth mentioning that each service running on Mac OS X and Mac OS X Server can require a special type of backup. These often involve stopping a service and then running a backup, given that some of the data cannot be backed up while the service is running. Many of these services, if provided by Apple, will be fairly straightforward to back up. For example, the comic in Figure 18 28 shows the process for backing up Apple s Final Cut Server, a popular solution for storing video assets in Mac OS X.
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CHAPTER 18: Backup and Fault Tolerance
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Figure 18 28. Backing up Final Cut Server
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Whether due to an intrusion, due to a hardware failure, or due to accidental deletion of data (we are our own worse security risks), chances are that at some point you will loose
CHAPTER 18: Backup and Fault Tolerance
data. In this chapter we looked at backing up Mac OS X so that if you lose data (or have data that is compromised), you will be able to restore that data. In this chapter, we started out by looking at some backup and storage theory. We then moved on to using Apple s Time Machine, which is built into Mac OS X. Because Time Machine isn t for everyone, we then looked at SuperDuper and Retrospect. Along the way we looked at bringing theory into practice. Another item that many will look to following an intrusion is data forensics. Therefore, in 19, we ll look at building an incident response plan and how to do some basic forensics steps in Mac OS X.
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