At customer sites, I often discover that they don't really have standardized procedures to prevent incidents or problems happening in their server environments. To make some predictions about future system behavior, you'll have to gather data, so it's very important to note the results of your actions in some sort of schema. After a couple of months you'll see patterns: errors that keep coming back, a spurt of growth on a certain volume, a sudden fall back in backup speed. This data will help you act before the problem surfaces.

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