On Mon, Aug 15, 2011 at 7:55 PM, NeilBrown <neilb@xxxxxxx> wrote: > Yes, add another one later would be difficult. But if you know up-front that > you will want three off-site devices it is easy. > > You could > > mdadm -C /dev/md0 -l1 -n2 -b internal /dev/A missing > mdadm -C /dev/md1 -l1 -n2 -b internal /dev/md0 missing > mdadm -C /dev/md2 -l1 -n2 -b internal /dev/md1 missing > mdadm -C /dev/md3 -l1 -n2 -b internal /dev/md2 missing > > mkfs /dev/md3 ; mount .. > > So you now have 4 "missing" devices. Alright, so I tried that on my project, being a low-end device is resulted in about 30-40% performance lost with 8 MDs (planning in advance), I tried disabling all bitmap to see if it helps and I get minimal performance gain. Is there anything I should tune in this case? -- 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
