On Tue, Sep 2, 2014 at 12:42 PM, Warren Young <warren at etr-usa.com> wrote: > On 8/29/2014 14:26, m.roth at 5-cent.us wrote: >> >> >> Note that we did this on *raw*, unpartitioned drives (not my idea). > > >> I added >> /dev/sdc to /dev/md4, and it started rebuilding. > > I know this isn't the answer you wanted, but it's probably the answer a lot > of people *wanted* to give, but chose not to, going by the crickets. (It's > either that or the 3-day holiday weekend.) I haven't used raw devices as members so I'm not sure I understand the scenario. However, I thought that devices over 2TB would not auto assemble so you would have to manually add the ARRAY entry for /dev/md4 in /etc/mdadm.conf containing /dev/sdd and /dev/sdc for the system to recognize it at bootup. > Are you certain /dev/sdc is partially overwritten now? What happens if you > try to mount it? If it mounts, go buy that second fresh disk, then set the > mirror up correctly this time. But sdd _should_ have the correct data - it just isn't being detected as a raid member. I think with smaller devices - or at least devices with smaller partitions and FD type in the MBR it would have worked automatically with the kernel autodetect. -- Les Mikesell lesmikesell at gmail.com