On Fri, Mar 13, 2009 at 1:09 PM, Christophe <x...@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?
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