On Wed April 28 2010 01:44:37 Stan Hoeppner wrote: > On a sufficiently fast system that is not loaded, the user will likely see > no performance degradation, especially given Linux' buffered I/O > architecture. However, on a loaded system, such as a transactional > database server or busy ftp upload server, such a RAID setup will bring the > system to its knees in short order as the CPU overhead for each 'real' disk > I/O is now increased 4x and the physical I/O bandwidth is increased 4x.
I've designed commercial database managers and OLTP systems. If CPU usage had ever become a factor in anything I had designed I would have been fired. If they're not I/O bound they're useless. With a few exceptions such as physical backups, any I/O bound application is going to be seek bound, not bandwidth bound. --Mike Bird -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
