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Table 7-3 Relative Costs of Recovery Sites
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7: Business Continuity and Disaster Recovery
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When setting up a hot site, the organization will need to send one or more technical staff members to the site to set up systems But once the systems are operating, much or all of the system- and database-level administration can be performed remotely However, in a disaster scenario, the organization may need to send the administrative staff to the site for day-to-day management of the systems This means that workspace for these personnel needs to be identified so that they can perform their duties during the recovery operation NOTE Hot-site planning needs to consider work (desk) space for on-site personnel Some colocation centers provide limited work areas, but these areas are often shared and often have little privacy for phone discussions Also, transportation, hotel, and dining accommodations need to be arranged, possibly in advance, if the hot site is in a different city from the primary site Warm Sites A warm site is an alternate processing center where recovery systems are present, but at a lower state of readiness than recovery systems at a hot site For example, while the same version of the operating system may be running on the warm site system, it may be a few patch levels behind primary systems The same could be said about the versions and patch levels of database management systems (if used) and application software: they may be present, but they re not as up-to-date A warm site is appropriate for an organization whose RTO figures range from roughly one to seven days In a disaster scenario, recovery teams would travel to the warm site and work to get the recovery systems to a state of production readiness and to get systems up-to-date with patches and configuration changes, to bring the systems into a state of complete readiness A warm site is also used when the organization is willing to take the time necessary to recover data from tape or other backup media Depending upon the size of the database(s), this recovery task can take several hours to a few days The primary advantage of a warm site is that its costs are lower than for a hot site, particularly in the effort required to keep the recovery system up-to-date The site may not require expensive data replication technology, but instead data can be recovered from backup media Cold Sites A cold site is an alternate processing center where the degree of readiness for recovery systems is low At the very least, a cold site is nothing more than an empty rack, or just allocated space on a computer room floor It s just an address in someone s data center or colocation site where computers can be set up and used at some future date Often, there is little or no equipment at a cold site When a disaster or other highly disruptive event occurs in which the outage is expected to exceed 7 to 14 days, the organization will order computers from a manufacturer, or perhaps have computers shipped from some other business location, so that they can arrive at the cold site soon after the disaster event has begun Then personnel would travel to the site and set up the computers, operating systems, databases, network equipment, and so on, and get applications running within several days
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The advantage of a cold site is its low cost The main disadvantage is the cost, time, and effort required to bring it to operational readiness But for some organizations, a cold site is exactly what is needed Table 7-4 shows a comparison of hot, warm, and cold recovery sites and a few characteristics of each Mobile Sites A mobile site is a portable recovery center that can be delivered to almost any location in the world A viable alternative to a fixed location recovery site, a mobile site can be transported by semitruck, and may even have its own generator, communications, and cooling capabilities APC and SunGuard have mobile sites installed in semitruck trailers Sun Microsystems has mobile sites that can include a configurable selection of servers and workstations, all housed in shipping containers that can be shipped by truck, rail, ship, or air to any location in the world Reciprocal Sites A reciprocal recovery site is a data center that is operated by another company Two or more organizations with similar processing needs will draw up a legal contract that obligates one or more of the organizations to temporarily house another party s systems in the event of a disaster Often, a reciprocal agreement pledges not only floor space in a data center, but also the use of the reciprocal partner s computer system This type of arrangement is less common, but is still used by organizations that use mainframe computers and other high-cost systems NOTE With the wide use of Internet colocation centers, reciprocal sites have fallen out of favor Still, they may be ideal for organizations with mainframe computers that are otherwise too expensive to deploy to a cold or warm site Geographical Site Selection An important factor in the process of recovery site selection is the location of the recovery site The distance between the main processing site and the recovery site is vital and may figure heavily into the viability and success of a recovery operation
Cold Computers Application Software Data Connectivity Support Staff Cost Ship to site To be installed To be recovered To be established Travel to site Lowest Warm On site Installed To be recovered Ready to go Travel to site Moderate Hot Running Running Continuously updated Already connected On site or remotely managed Highest
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