On Wed, 9 Mar 2011, Ross Walker wrote: > On Mar 8, 2011, at 12:02 PM, John Hodrien <J.H.Hodrien at leeds.ac.uk> wrote: > >> The absolute definiton of safe here is quite important. In the event of a >> power loss, and a failure of the UPS, quite possibly also followed by a >> failure of the RAID battery you'll get data loss, as some writes won't be >> committed to disk despite the client thinking they are. > > Don't forget about kernel panics and the accidentally pulled the plugs... Sure, but the kernel's always in a position to screw you over. While you're being negative, include bad memory on the RAID card, and then your life becomes really interesting. jh