On 19/10/17 02:52, sfunk1x wrote:

Thanks for the vote of confidence in not losing data here. As I
mentioned above, I've set SELinux into permissive mode. I'm sort of at a
loss as to what to do next. Since sd[fgh] don't have any superblock
data, can I try to bring the array back online with 5 drives, then
re-add the last three, with the hope that they sync? There obviously
hasn't been any writes to the last three drives since the hard system
reboot, so I'd hope their event numbers would be in sync?

Okay. First thing I'd try is temporarily get rid of mdadm.conf. You
don't actually need it. Then do "mdadm --stop /dev/md0" followed by
"mdadm --assemble --scan".

That'll tell mdadm to do a "best effort" to get everything running.
*Always* do an mdadm --stop between every attempt, because the quickest
way to mess up recovery attempts is to have the wreckage of a previous
attempt lying around.

If that doesn't work, then try assembling the array explicitly, ie
listing all the drives. I can't remember whether order is important - so
long as you don't specify --force it'll either work or fail, it won't do
any damage.

Beyond this point I'm getting out of my depth, I don't have the broad
experience so I'll have to step back and let others chime in, but
there's a good chance this will get your array back.

Cheers,
Wol