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Linux: Reliability, Availability. and Serviceability

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Linux

A recent patch posted to the lkml aimed to make it possible to use both kdb and kdump at the same time, and instead led to an interesting discussion about RAS (Reliability, Availability, and Serviceability) tools. Vivek Goyal compared the two main philosophies, "so basically there are two kind of users. One who believes that despite the kernel [having] crashed something meaningful can be done," versus, "exec on panic, which thinks that once [the] kernel is crashed nothing meaningful can be done". When the discussion focused on kdb, Keith Owens noted:

"The problem above applies to all the RAS tools, not just kdb. My stance is that _all_ the RAS tools (kdb, kgdb, nlkd, netdump, lkcd, crash, kdump etc.) should be using a common interface that safely puts the entire system in a stopped state and saves the state of each cpu. Then each tool can do what it likes, instead of every RAS tool doing its own thing and they all conflict with each other, which is why this thread started."

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