I have a 1.5Tb RAID5 machine (3*750Gb disks + 1 spare) and need to move some write-intensive services there. Unfortunately, the performance is unacceptable. Thus, I wanted to convert the machine to RAID10. My theory was: backup, remove the spare, set one disk faulty, remove it, create a degraded RAID10 on the two freed disks, copy data, kill RAID5, add disks to new RAID10. Unfortunately, mdadm (2.5.3) doesn't seem to agree; it complains that it cannot assemble a RAID10 with 4 devices when I ask it to: mdadm --create -l 10 -n4 -pn2 /dev/md1 /dev/sd[cd] missing missing I can kind of understand, but on the other hand I don't. After all, if you'll allow me to think in terms of 1+0 instead of 10 for a second, why doesn't mdadm just assemble /dev/sd[cd] as RAID0 and make the couple one of the two components of the RAID1? What I mean is: I could set up RAID1+0 that way; why doesn't it work for RAID10? Do you know of a way in which I could migrate the data to RAID10? Unfortunately, I do not have more 750Gb disks available nor a budget, and the 1.5Tb are 96% full. Cheers, -- martin; (greetings from the heart of the sun.) \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; net@madduck spamtraps: madduck.bogus@xxxxxxxxxxx "if a man treats life artistically, his brain is his heart." -- oscar wilde
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