Chapter 34. Maintenance Windows

If you had to power off an entire datacenter, do a lot of maintenance, and then bring it all back up, would you know how to manage the event? Computer networks and datacenters sometimes need massive, disruptive maintenance. Cooling systems must be powered off, drained, cleaned, and refilled. Large volumes of data must be moved between file servers to optimize performance for users or simply to provide room for growth. Also, improvements that involve many changes sometimes can be done much more efficiently if all users agree to a large window of downtime.

Sometimes a company allocates a specific time slot for major and risky changes to consolidate downtime to a specific time when customers will be least affected. ...

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