On Mon, 18 Nov 2013 15:13:58 -0800 "David F." <df7729@xxxxxxxxx> wrote: > output of 'mdadm --assemble --scan --no-degraded -v' (mdadm 3.2.6): ... > mdadm: no RAID superblock on /dev/sdc2 > > output1 of 'mdadm --assemble --scan --no-degraded -v' (mdadm 3.3 - > note using /dev/sdc2, not /dev/sdc): ..... > mdadm: /dev/sdc2 is identified as a member of /dev/md/imsm0, slot -1. So there is the problem. mdadm 3.2.6 sees no RAID superblock on sdc2, while mdadm 3.3 does (but should not). However that code hasn't changed! load_super_imsm() still starts with: if (test_partition(fd)) /* IMSM not allowed on partitions */ return 1; and test_partition hasn't changed since it was written in April 2010 for mdadm 3.1.3. So I'm quite perplexed. Is your mdadm-3.3 compiled from source or provided by a distro? Can you run the "mdadm --assemble" under strace and post the result? strace -o /tmp/some-file mdadm --assemble --scan ...... Thanks, NeilBrown
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