Greg Stark <[EMAIL PROTECTED]> writes: > In any case the issue with the IDE protocol is that fundamentally you > can only have a single command pending. SCSI can have many commands > pending.
That's the bottom line: the SCSI protocol was designed (twenty years ago!) to allow the drive to do physical I/O scheduling, because the CPU can issue multiple commands before the drive has to report completion of the first one. IDE isn't designed to do that. I understand that the latest revisions to the IDE/ATA specs allow the drive to do this sort of thing, but support for it is far from widespread. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster