> From: Bob Friesenhahn [mailto:bfrie...@simple.dallas.tx.us] > > The disk write cache helps with the step where data is > sent to the disks since it is much faster to write into the disk write > cache than to write to the media. Besides helping with unburdening > the I/O channel,
Having the disk cache disabled doesn't mean the cache isn't used. It only means the disk doesn't acknowledge the write until the write has been flushed. If you have a bunch of disks with platters that can go 500Mbit, all connected to a 6Gbit bus, the whole bus doesn't slow down to 500Mbit while a single disk is writing. No matter what happens, the controller is going to send a chunk of data into the disk at 6Gbit and wait for the disk to acknowledge it. Meanwhile the controller is free to send data to other disks too. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
