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Mdadm problem, need advice on sleeping the assemble or not running at boot?

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http://ubuntuforums.org – Hello All, I'm having a problem with my mdadm setup. I have a raid-6 running and it currently has 6 drives. My Mobo has 6 sata ports, one of which is used up for the boot drive (not involved in the array). The sixth array drive is on a PCI sata/raid card. I have a recurrent problem where my raid will drop one of the disks at boot. It will still assemble (dirty) because I had that configured when I used dpkg-reconfigure mdadm. The server is headless, so dropping into busybox wasn't an option for me. I can re-add the missing drive, but this causes a rebuild because the other 5 drives are in on (Hardware)