1 Your basic IT nightmare It was kind of the call that no one in IT wants to get. Randy Gilman, Manager, Information Technology for Clarke Power Services, Inc., answered his phone one Sunday about a year ago. “We’re having some problems,” said an IT team colleague, who was converting all disks on the company’s SAN to the latest version of VMware during an upgrade. Gilman hurried in to work. “We thought it was just some problems with the Exchange server,” Gilman recalls. “But as we worked through it, other problems came up.” The company’s SAN was down. “We could tell that the SAN was corrupted, and we couldn’t really pinpoint where that corruption was,” Gilman says. Access to data was lost. The 800 employees in Clarke’s three lines of business, truck repair, power generation, and

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