I've got 4 fibre channel JBODs that I want to use with mdadm RAID 10. They have 14 drives each, for a total of 56 drives. I'd like to create a RAID-10 device where no copies end up on the same JBOD. IOW, if copy 1 goes to the first drive on the first JBOD, copy 2 should go to the first drive on the third JBOD. If copy 1 goes to the second drive on the second JBOD, copy 2 should go to the second drive on the fourth JBOD. How should I order the drives on my mdadm --create command line? Here's more-or-less what I want in pictures, using 3 drives per JBOD for simplicity, with A,B,a,b,1,2 meaning the same thing they do in the RAID FAQ: jbod-1-1 Aa1 Ba1 Ca1 jbod-1-2 Ab1 Bb1 Cb1 jbod-1-3 Ac1 Bc1 Cc1 jbod-2-1 Da1 Ea1 Fa1 jbod-2-2 Db1 Eb1 Fb1 jbod-2-3 Dc1 Ec1 Fc1 jbod-3-1 Aa2 Ba2 Ca2 jbod-3-2 Ab2 Bb2 Cb2 jbod-3-3 Ac2 Bc2 Cc2 jbod-4-1 Da2 Ea2 Fa2 jbod-4-2 Db2 Eb2 Fb2 jbod-4-3 Dc2 Ec2 Fc2 The data doesn't have to look exactly like that, as long as the principle is maintained: The copies of the data should be on disks in separate JBODs. Thanks. Andrew -- 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
