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Some mdadm guru, please help me! I am confused about mdadm. I have a raid0 array that mdadm won't assemble, but if I make loopbacks of the components I *can* assemble my array from that. I have an entry in /etc/mdadm/mdadm.conf for my array and when I do: # mdadm --assemble --scan mdadm: no devices found for /dev/md25 Let's risk blowing away my data (after a backup): # mdadm --create /dev/md25 --level=0 --raid-devices=4 /dev/md16 /dev/md17 /dev/md18 /dev/md19 mdadm: Cannot open /dev/md16: Device or resource busy mdadm: Cannot open /dev/md17: Device or resource busy mdadm: Cannot open /dev/md18: Device or resource busy mdadm: Cannot open /dev/md19: Device or resource busy mdadm: create aborted Look at one of the components with "mdadm --misc --examine /dev/md19" and it knows it is part of md25. Each of the four components claims the same UUID for md25. Some background: I have a pair of disks that I chopped up into a bunch of matching partitions, and I have each pair in a raid1 array. Most of those are used directly, but I wanted a bigger partition; that is why I am gluing them into a raid0 array. And because there is raid1 underneath the raid0, that striping isn't as dangerous as it looks. By doing this loopback I am up and running again, but it is wrong to run this way, just wrong. Can someone explain what mdadm is doing? Thanks, -kb, the Kent who newly nervous that his raid1 redundancy won't save him from operator or software error.
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