9-11 September 2019
Europe/Lisbon timezone

Filesystem atomic writes / O_ATOMIC

11 Sep 2019, 10:40
Jade/room-I&II (Corinthia Hotel Lisbon)


Corinthia Hotel Lisbon





seems like the patches proposed by Fusion-io devs for general O_ATOMIC support within Linux kernel are in stand-by since 6 years.. -- any plans to address it ?.. What is the main reason to not guarantee atomicy of O_DIRECT writes on flash drives? -- seems like most of flash storage vendors are able to provide atomic writes support on HW level, and just SW level (kernel/FS/etc.) is missed.. The main benefit for MySQL/InnoDB is to get a rid of "double write" to protect from data corruption (partially written pages) -- so, every page is written twice, increasing IO write traffic + doubling page write latency + reducing by half flash drive life expectation..

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