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I have two RAID 10 arrays, one for the mail stores and one for the transaction logs. I have one drive left that can be a hot spare to either the mail stores or the transaction logs array, but not both. Would is be better to have the hot spare for one over the other?

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Losing either will cause Exchange to shutdown, but in the long-term losing the database is probably the worst of the two to lose. I'd assign the hot-spare to the database (and would think about looking for a RAID controller that supports a global hot-spare... >smile<)

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