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grub fails to boot, prints only a single dot

From: Alex Regan
Subject: grub fails to boot, prints only a single dot
Date: Tue, 09 Jun 2015 09:49:20 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0


I have a fedora20 system on a 1U rackmount Supermicro chassis with two disks in a mdadm RAID1 configuration that's been running for quite some time. I recently added two additional disks, in a separate RAID1, and mounted it on /var.

After adding the two new disks, the system failed to boot. No grub boot menu or anything. Just a single dot then a newline, where the system would sit there until I eventually had to hard reset it to boot.

Removing the two new disks and the system boots again normally (except for the new /var mountpoint, of course).

Running grub2-install again for all four disks doesn't help. I've even uninstalled and reinstalled the kernel, and tried to manually regenerate the initramfs with no change.

Does anyone understand grub enough to help troubleshoot this? I suspect it's something to do with the second-stage loader?


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