On Sunday January 27, keld@xxxxxxxx wrote: > Hi > > I have tried to make a striping raid out of my new 4 x 1 TB > SATA-2 disks. I tried raid10,f2 in several ways: > > 1: md0 = raid10,f2 of sda1+sdb1, md1= raid10,f2 of sdc1+sdd1, md2 = raid0 > of md0+md1 > > 2: md0 = raid0 of sda1+sdb1, md1= raid0 of sdc1+sdd1, md2 = raid01,f2 > of md0+md1 > > 3: md0 = raid10,f2 of sda1+sdb1, md1= raid10,f2 of sdc1+sdd1, chunksize of > md0 =md1 =128 KB, md2 = raid0 of md0+md1 chunksize = 256 KB > > 4: md0 = raid0 of sda1+sdb1, md1= raid0 of sdc1+sdd1, chunksize > of md0 = md1 = 128 KB, md2 = raid01,f2 of md0+md1 chunksize = 256 KB > > 5: md0= raid10,f4 of sda1+sdb1+sdc1+sdd1 Try 6: md0 = raid10,f2 of sda1+sdb1+sdc1+sdd1 Also try raid10,o2 with a largeish chunksize (256KB is probably big enough). NeilBrown > > My new disks give a transfer rate of about 80 MB/s, so I expected > to have something like 320 MB/s for the whole raid, but I did not get > more than about 180 MB/s. > > I think it may be something with the layout, that in effect > the drives should be something like: > > sda1 sdb1 sdc1 sdd1 > 0 1 2 3 > 4 5 6 7 > > And this was not really doable for the combination of raids, > because thet combinations give different block layouts. > > How can it be done? Do we need a new raid type? > > Best regards > keld > - > 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 - 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
