Patching runtime kernel
Posted Dec 20, 2008 1:35 UTC (Sat) by giraffedata
In reply to: Patching runtime kernel
Parent article: Followups: performance counters, ksplice, and fsnotify
What you have isn't actually an aversion to downtime, it's an aversion to reboots. Which another reason to like patching a kernel on the fly.
People who are averse to down time (i.e. they can't afford to be offline for three minutes) do usually have some kind of redundant system thing so they can reboot one system, then the other, and thereby install a kernel patch without ever being offline.
People who are averse to a reboot (i.e. they don't want to lose the state gathered by the past four days of calculation) might use checkpointing in order to tolerate reboots, but you're at least one example that they don't. Because your users use generic tools, the only way I know that checkpointing could eliminate the pain of reboot is those new virtual machine-based things.
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