On 03/08/2016 08:09 PM, Jason Dillaman wrote:
librbd provides crash-consistent IO. It is still up to your application to
provide its own consistency by adding barriers (flushes) where necessary. If
you flush your IO, once that flush completes you are guaranteed that your
previous IO is safely committed to disk.
Jeff Moyer wrote a good article on how applications can manage data durability
for lwn.net a few years back - still worth reading:
https://lwn.net/Articles/457667
This is more focused on applications on top of file systems, but is still
relevant for applications running on block devices.
Regards,
Ric
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