Miquel van Smoorenburg wrote:
There is no such thing as "raid caching". There is something called "write caching", but that doesn't have anything to do with reads.
I'm not trying to start a debate, but I don't follow this logic at all. What if the system tries to read back some write cached data? If it delays the commit then it delays readback, unless it allows read from the cache, in which case it speeds up reads. Either way it greatly affects reads.