Hello, > > > > > But the cat /dev/md31 >/dev/null (RAID0, the sum of 4 nodes) only > > > > > makes ~450-490 Mbit/s, and i dont know why.... > > > > > > > > > > Somebody have an idea? :-) > > > > > > > > Try increasing the read-ahead setting on /dev/md31 using 'blockdev'. > > > > network block devices are likely to have latency issues and would > > > > benefit from large read-ahead. > > > > > > Also try larger chunk-size ~4mb. > > > > Ahh. > > This is what i can't do. :-( > > I dont know how to backup 8TB! ;-) > > Maybe you could use your mirror!? I have one idea! :-) I can use the spare drives in the disknodes! :-) But i don't know exactly what to try. increase or decrease the chunksize? In the top layer raid (md31,raid0) or in the middle layer raids (md1-4, raid1) or both? Can somebody help me to find the performance problem source? Thanks, Janos > > -- > Al - 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
