On Saturday March 8, keld@xxxxxxxx wrote: > I want to assemble the root partition automatically, without having > a configuration file. Is that possible? > > mdadm -A --scan > > does seem to require a configuration file. > > On the other hand, I think all info needed is available in the super > blocks, and a traversal of the partitions present on the system (ala > fdisk -l) could give consistent naming - there seems to be no /dev/md > association available in the superblock. The information that is not present in the super blocks is which array you want to assemble. This becomes particularly important if you move some drives from one machine to another. If the target machine and a "/dev/md0" and the drives that are moved are from a "/dev/md0" on the source machine, then any auto-assembly on the target machine has not obvious way to know which set of "/dev/md0" devices to assemble. For that reason mdadm knows about a "homehost". You can tag each array with a hint about what host it expects to be assembled on. If you run mdadm -As --homehost=`hostname` then it will auto-assemble any arrays for the current host. If you arrays haven't been tagged for at particular host, then mdadm -As --homehost=`hostname` --auto-update-homehost will automatically tag everything that is found for the current host. This is not something that should be done automatically, but it OK to do one when you know you haven't done anything interesting with devices. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
