We have approximately 124 mira hosts. Some serve as vpshosts hypervisors and some serve as OSD nodes in the longrunningcluster. The remaining nodes are used as baremetal testnodes.

See the [long-running-cluster] and [vps_hosts] groups in ceph-sepia-secrets Ansible inventory to see what systems are used for.

These also have 10Gb SFP+ ports that are cabled but may need switch port configuration. Probably useful to have before re-adding to cluster.

I was able to install Fedora23 on apama001 but still got Red Screen of Death and “Illegal Opcode” after grub tries to boot the OS. Something about rpm-based distros doesn't like searching for the root partition using UUID.

What fixed it was finding the proper root drive and manually booting to it in a grub rescue prompt. See below.

grub> ls (hd0,msdos1)/boot

vmlinuz-4.2.3-300.fc23.x86_64 System.map-4.2.3-300.fc23.x86_64 config-4. 2.3-300.fc23.x86_64 initramfs-4.2.3-300.fc23.x86_64.img initramfs-0-rescue-ba8d c4c42e5a4ec483a635961112dfd8.img vmlinuz-0-rescue-ba8dc4c42e5a4ec483a635961112d fd8 initrd-plymouth.img                                                         

grub> set root=(hd0 <tab>
Possible partitions are:

Device hd0: No known filesystem detected - Sector size 512B - Total size        488386584KiB

Partition hd0,msdos1: Filesystem type ext* - Last modification time     2016-05-03 18:11:21 Tuesday, UUID 4390d2e3-3154-4855-8ad4-8417c430d982 -        Partition start at 1024KiB - Total size 488385536KiB                                                                                                            
grub> set root=(hd0,msdos1)
grub> linux /boot/vmlinuz-4.2.3-300.fc23.x86_64 root=/dev/sda1
grub> initrd /boot/initramfs-4.2.3-300.fc23.x86_64.img
grub> boot

For CentOS, this had to be modified a bit:

grub> set root=(hd0,msdos1)
grub> linux /vmlinuz-3.10.0-327.el7.x86_64 root=/dev/sdz3 console=ttyS1,115200
grub> initrd /initramfs-3.10.0-327.el7.x86_64.img
grub> boot

There's probably a permanent fix that can be applied in grub.cfg but haven't looked into it.