On Wed, Jun 9, 2010 at 7:06 AM, MRK <mrk@xxxxxxxxxxxxx> wrote: > Same problem with write-mostly/write-behind I think. I don't know how long > is the queue that holds data already committed to the SSD and not yet > committed to the HDD but it can't be too long. I'm reading the "man md" > right now and it's not extremely clear on this. I have the impression the > queue between the two it's either the /sys/block/hdddevice/queue/nr_requests > or it uses the write-intent bitmap (if set). In case of the nr_requests, > it's gonna be very short so the SSD can give you quick bursts but continuous > performance will be that of the HDD. I tried this once and posted some bonnie++ results: https://kerneltrap.org/mailarchive/linux-raid/2010/1/31/6742263 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
