Architecting Availability and Disaster Recovery Solutions 
by Tim Read
April, 2007
IT departments typically run four broad classes of service in the data centre: mission critical, business critical, business operational and administrative services. Which service falls into which category is normally agreed between the business units and the IT department by determining the importance of various business processes and how these map on to IT systems. Each class, and possibly individual services, will have service level agreement (SLAs). In turn, these demand different levels of protection against failure, whether caused by hardware or software problems, administrative error, data loss or corruption or disasters of various sorts. Problems that make the data unavailable, through hardware or software failure, require a different solution to those that make the underlying data itself unavailable, either through corruption or deletion.
This blueprint, first published in April, 2006, has been newly updated to reflect Sun's latest server and storage products.
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