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Citrix XenApp Platinum Edition for Windows: The Official Guide
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AN INFORMATION TECHNOLOGY PLAN TO MEET BUSINESS CONTINUITY REQUIREMENTS
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CME s centralized application delivery environment makes the implementation of these requirements possible CME Omaha, as the recovery site for Tier 1 and Tier 2, will need to have hot support for 500 users These users will require the defined Tier 1 data, applications, and access through the Internet Tier 3 will be implemented back at the Denver facility or a temporary facility (which could be CME Omaha) will be used During the two-week window between Tier 2 and Tier 3, CME IT will have to work feverishly to acquire all of the required hardware to replace any hardware lost in the disaster
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A hot backup data center is a backup data center with real-time servers, ready to be used at a moment s notice The advantage of a hot backup data center is that it provides a fast resumption plan The disadvantage is that it requires redundant hardware that generally remains idle except to receive updates and periodic testing The most important element of the data center design is geographical location In order for the backup data center to truly provide resumption, the data center must be located a significant distance from the main data center, and it should not be subject to the same disasters as the main data center (for example, both data centers should not be close enough that a single hurricane could render them both useless) The rest of the data center design components should mimic the main design center In the case of CME, the backup data center only needs to support 500 users, so the data center will be much smaller than the corporate data center, which supports 3,000 users Additionally, there is no need to replicate the testing and training environment, or some of the redundancy that exists at the main data center Therefore, the CME Omaha hot backup data center will be about ten percent of the size and cost of the main data center
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Although the backup data center is much smaller than the main data center, defining the critical components is still an important part of the business-continuity plan to ensure that everything will work upon failover Although the list of required hardware and software for most organizations will differ, studying the components required at the CME data center and comparing these to the headquarters data center will allow you to extrapolate what is needed for your organization CME s backup data center will require the following components: Ten Citrix XenApp servers imaged from the CME headquarters data center to support the 500 possible users required upon failover A DMZ-based NetScaler Enterprise/Access Gateway Enterprise appliance and an internal Web Interface One Oracle Database server One Microsoft SQL server One Microsoft Exchange server
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LAN and WAN networking components to support the DR site Internet connectivity utilizing a separate ISP than what is used at the Denver data center A firewall with DMZ and VPN hardware An Internet-based secondary mail server to queue mail in case the Exchange server is offline Internal and Internet DNS servers Storage area network solution (SANS) Appropriate tape backup units to facilitate the recovery of archived data and any information not located on the SAN Backup power for the data center
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Hot Site Data and Database Resumption
The most critical part of the business-continuity plan is the ability to recover the file and database data (the disaster-recovery section of business continuity) Even if the full business-continuity plan is not enacted, the recovery of data is critical For example, if the Oracle data becomes corrupt or the Oracle cluster should completely fail, even though this does not constitute a disaster, it is critical that the data be recovered quickly and easily Worse yet, if a government seizure should happen, there must be a plan to restore the data to nonseized hardware in a timely manner In order to service this, all databases, files, and e-mail data must be copied to the backup data center nightly at a minimum Although this is easy to accomplish with file data, doing this with database and e-mail data is more difficult The larger SANS vendors (HP, EMC, and LeftHand Networks) all support a snapshot technology to effectively copy Exchange and database data across a WAN to another similar SANS device Also, some non-hardware-based technologies (such as NSI Software s Double Take) mirror Microsoft Exchange and other database software Note that in the CME scenario, they are only copying the data at night Therefore, if a disaster happens late in the day, requiring failover to CME Omaha, all data created in the course of the day will be lost If your organization requires less data loss risk than this, the solutions from LeftHand, EMC, HP, and NSI can provide up-to-thesecond transaction redundancy (typically called double-commit ), but the dedicated bandwidth requirements and associated costs increase dramatically Figure 8-2 shows an example of how database server(s) can be set up for replication to a DR site
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