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If you upgrade systemd or the kernel, yes, you should reboot your machine. Ideally, it shouldn't take more than a minute or two.


Obviously not talking about servers here. Those RAID can take more than a few minutes to spin-up.


If you can't afford 3 minutes of downtime (how long a Dell PowerEdge R620 takes to start responding to ping again after a shutdown -r now), you really should reconsider running that service without a redundant system at the ready.




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