>>> On Sun, 27 Jan 2008 20:33:45 +0100, Keld Jørn Simonsen >>> <keld@xxxxxxxx> said: keld> Hi I have tried to make a striping raid out of my new 4 x keld> 1 TB SATA-2 disks. I tried raid10,f2 in several ways: keld> 1: md0 = raid10,f2 of sda1+sdb1, md1= raid10,f2 of sdc1+sdd1, md2 = raid0 keld> of md0+md1 keld> 2: md0 = raid0 of sda1+sdb1, md1= raid0 of sdc1+sdd1, md2 = raid01,f2 keld> of md0+md1 keld> 3: md0 = raid10,f2 of sda1+sdb1, md1= raid10,f2 of sdc1+sdd1, chunksize of keld> md0 =md1 =128 KB, md2 = raid0 of md0+md1 chunksize = 256 KB keld> 4: md0 = raid0 of sda1+sdb1, md1= raid0 of sdc1+sdd1, chunksize keld> of md0 = md1 = 128 KB, md2 = raid01,f2 of md0+md1 chunksize = 256 KB These stacked RAID levels don't make a lot of sense. keld> 5: md0= raid10,f4 of sda1+sdb1+sdc1+sdd1 This also does not make a lot of sense. Why have four mirrors instead of two? Instead, try 'md0 = raid10,f2' for example. The first mirror of will be striped across the outer half of all four drives, and the second mirrors will be rotated in the inner half of each drive. Which of course means that reads will be quite quick, but writes and degraded operation will be slower. Consider this post for more details: http://www.spinics.net/lists/raid/msg18130.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
