On Mon, Mar 10, 2008 at 10:01:50AM +1100, Neil Brown wrote: > 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. Yse, that is evident. > This becomes particularly important if you move some drives from one > machine to another. Moving a disk from one machine to another is not the common thing with raids. This is only done in special cases, and not prat of ordinary operations. > 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. Moving a disk from one machine to another should be a special case, and done by hand. > 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. Hmm, I am still looking for a way to boot a linúx raid as root. mkinitrd does not seem to handle linux raids at all. Only hardware raids (doen by a controller). best regards keld -- 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
