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Lessons from a SAN Failure

At 1:10AM Sunday morning the main SAN at one of my clients suffered a “partial” failure. Partial means that the SAN was still online and functioning but the LUNs attached to our two main SQL Servers “failed”. Failed means that SQL Server wouldn’t start and the MDF and LDF files mostly showed a zero file size. But they were online and responding and most other LUNs were available.

This is a companion discussion topic for the original entry at http://billg.sqlteam.com/2010/02/26/lessons-from-a-san-failure/