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I administer half a dozen Linodes. For the first couple of servers that were scheduled for maintenance (including an SMTP server), I dealt with this by provisioning a new server that's identical to the exiting one, then doing an IP swap to the new server. I assumed the "short delay before both addresses become available" mentioned in the Linode manager was on the order of seconds, but one of the IPs being swapped took at least 5 minutes to become routable. That resulted in some non-trivial downtime, so for the rest of servers I used DNS to direct traffic to the new servers. Not as easy as an IP swap, but much more predictable.
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