I created a Raid10 array with 16 sata 1TB disks and the array performance seems to be limited by the md0_raid10 taking 99% of one core and not scalling to other cores. I tried overclocing the cpu cores and this lead to a small increase in performance ( but md0_raid10 keeps eating 99% of one core ). I'm using: - a phenom X6 at 3600mhz - 16 seagate SSHDs ( sata3 7200RPM with 8GB ssd cache ) - 4x marvell 9230 sata3 controllers ( 4 ports each ) pcie 2.0 2x lanes. - 8GB ram - custom 3.12 kernel and mdadm compiled from latest source what I did to test performance was to force a check on the array, and this leads to mdadm reporting a speed of about 990000K/sec. The hard disks report a 54% utilization. ( Overclocking the cpu by 200mhz increases the resync speed a bit and the hdd's utilizartion to about 58% ) If I do the same with a raid5 array instead of raid10, them resync speed will be almost double of raid10, the harddisk utilization reported will be 98-100% and I can see at least two cores being used. ________________________________________________________________________________ Mensagem enviada através do email grátis AEIOU http://www.aeiou.pt -- 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
