> I am curious about the durability and how well tested all of that is though. On the one hand, filesystems put a lot of work towards ensuring that bytes writte

> I am curious about the durability and how well tested all of that is though. On the one hand, filesystems put a lot of work towards ensuring that bytes written to disk and synced are most likely durable, All of the SSDs that this software might be deployed to have power loss protection capacitors to ensure the drive can flush its write caches when necessary. So this software only needs to make sure that the OS actually sends data to the drive instead of holding it back in an IO scheduler queue (as you point out, they're already bypassing the FS layer). Since this software should be pretty good at structuring its writes in an SSD-friendly pattern, the operating system's IO scheduler should probably just be disabled.