Re: BBU Cache vs. spindles

Bruce Momjian <bruce@momjian.us> wrote:

> I assume we send a full 8k to the controller, and a failure during
> that write is not registered as a write.

On what do you base that assumption?  I assume that we send a full
8K to the OS cache, and the file system writes disk sectors
according to its own algorithm.  With either platters or BBU cache,
the data is persisted on fsync; why do you see a risk with one but
not the other?

-Kevin