JaniD++ wrote: > Al Boldi wrote: > > Neil Brown wrote: > > > On Saturday November 26, djani22@xxxxxxxxxxxxx wrote: > > > > The cat /dev/nb# >/dev/null makes ~ 350 Mbit/s on each nodes. > > > > The cat /dev/nb0 + nb1 + nb2 + nb3 in one time parallel makes > > > > ~780-800 Mbit/s. - i think this is my network bottleneck. > > > > How much do you get w/ nb0+1,2,3 and nb0+1+2,3 respectively? > > I unable to test write, because this is a productive system. > Think this value is about 75-80 per node and ~200-250 in md31. How much do you get with: cat nb# + nb# > /dev/null cat nb# + nb# + nb# > /dev/null respectively? > > > > 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!? -- 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
