>>>>> "Wols" == Wols Lists <antlists@xxxxxxxxxxxxxxx> writes: Wols> On 09/09/18 15:32, Wilson Jonathan wrote: >> I've tried to google, but its not being my friend as I may be using the >> incorrect terms. >> Wols> Warning! As far as linux is concerned, raid-10 and raid-1+0 are Wols> different beasts ... >> What I'm trying to find out is if I can create a raid10 with six/6 >> drives but with a triple mirror where there are only 2 mirrors >> containing 3 drives a piece. Wols> That should be doable. If you want a raid-1+0, create two 3-drive Wols> raid-0s, and then create a raid-1 over the top. That will give you 3 Wols> raid arrays to manage at the linux level :-( I think you're mixing up what he wants here... He wants two triple disk RAID1s (three way mirrors) with a RAID0 stripe on top. Easy peasy. Do all the following as root. I'm just doing it on fake devices, you do it on regular disks, which I suggest you format and put partitions on and use the partitions instead. truncate -s 10m /var/tmp/loop1 losetup loop1 /var/tmp/loop1 # Repeat for other five devices mdadm -C /dev/md91 -l 1 -n 3 /dev/loop[123] mdadm -C /dev/md92 -l 1 -n 3 /dev/loop[456] mdadm -C /dev/md9 -l 0 -n 2 /dev/md9[12] # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] md9 : active raid0 md92[1] md91[0] 17408 blocks super 1.2 512k chunks md92 : active raid1 loop6[2] loop5[1] loop4[0] 10176 blocks super 1.2 [3/3] [UUU] md91 : active raid1 loop3[2] loop2[1] loop1[0] 10176 blocks super 1.2 [3/3] [UUU] Wols> I don't know the syntax off the top of my head, but telling mdadm to Wols> create a raid-10 with two mirrors should be pretty easy, then it's just Wols> the one raid to manage. Wols> Look at the raid wiki. This page in particular has an explanation of Wols> raid-10 and raid-1+0 Wols> https://raid.wiki.kernel.org/index.php/What_is_RAID_and_why_should_you_want_it%3F Wols> Note in particular that certain variants of raid-10 can *not* be Wols> explanded, so if you decide you want a bigger raid you're stuck with Wols> creating the new raid then moving the old one across. Wols> Cheers, Wols> Wol
