On Mon, 2007-09-10 at 22:44 +0100, Gregory Stark wrote: > What I don't understand is the bit about "until Postgres gets AIO + the > ability to post multiple concurrent IOs on index probes". Even with AIO your > seek times are not going to be improved by wide raid stripes. And you can't > possibly find the page at level n+1 before you've looked at the page at level > n. Do you mean to be able to probe multiple index keys simultaneously? How > does that work out? > I think he's referring to mirrors, in which there are multiple spindles that can return a requested block. That could mitigate random I/O, if the I/O is asynchronous and something intelligent (OS or controller) can schedule it. Regards, Jeff Davis ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
