On Fri, Mar 13, 2009 at 1:09 PM, Christophe <xof@thebuild.com> wrote:
>
> On Mar 13, 2009, at 11:59 AM, Joshua D. Drake wrote:
>>
>> Wait, actually a good BBU RAID controller will disable the cache on the
>> drives. So everything that is cached is already on the controller vs.
>> the drives itself.
>>
>> Or am I missing something?
>
> Maybe I'm missing something, but a BBU controller moves the "safe point"
> from the platters to the controller, but it doesn't move it all the way into
> the OS.
>
> So, if the software calls fsync, but fsync doesn't actually push the data to
> the controller, you are still at risk... right?
Ding!