I have a virtualization host running on an MD root filesystem. I also have two whole disks allocated to a virtualized guest which is doing an MD RAID1. The host is seeing the array (i.e. it shows up in /proc/mdstat). I'd like to prevent this, if for no other reason than if there's a problem with that array, it prevents (or at least delays) booting the host. I've tried setting "AUTO +1.x homehost -all" "AUTO homehost -all" and even "AUTO -all" in /etc/mdadm/mdadm.conf. I'm updating the initrd and rebooting after each change. I've tried "msdos" as well as GPT labels on the disks used by the guest. In every case I've tried, it's still imported. I'm running Ubuntu 12.04 "Precise" on both the host and the guest. $ uname -a Linux HOSTNAME 3.2.0-45-generic #70-Ubuntu SMP Wed May 29 20:12:06 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux $ mdadm --version mdadm - v3.2.5 - 18th May 2012 Does this suggest the initrd scripts are broken on Ubuntu, am I doing something wrong, or is it just not possible to prevent this autodetection? Thanks for any insight you can provide! -- Richard
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