| Headlines |
| 2021-07-06 |
How HAMMER2 tries to fail gracefully |
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Modern operating systems include a lot of components and a lot of variables. We tend not to notice when the thousands of pieces are working together in harmoney, but if something goes wrong it's possible for the whole house of cards to fall. Matthew Dillon recently shared opinions on how systems fail and how they can attempt to fail in more positive ways, using DragonFly BSD's HAMMER2 filesystem as an example. "For DFly, an async block write failure leaves the buffer marked dirty so the filesystem data and meta-data state remains consistent on the live system (even if it cannot be flushed). This is a choice taken from a list of bad choices, because leaving a block dirty means that dirty blocks can build-up in RAM until you run out of ram. But it is better than the alternative (presenting stale data to a filesystem and/or to an application which then causes a chain-reaction of corruption on a running system)." |
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