On Fri, 08 Oct 2010 00:20:35 -0400 Joe Landman <landman@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > Not having much luck with this. Let me explain ... > > Imagine we have a RAID1 with 3 elements. It was originally a RAID1 with > 2 elements, and we added a 3rd using > > mdadm /dev/md0 --add /dev/loop1 > > What I want to do is conceptually very simple. I want to permanently > remove loop1, without having the array become dirty, or degraded. That > is, I would like > > mdadm /dev/md0 --fail /dev/loop1 --remove /dev/loop1 > > to result in a clean array with two members. > > It doesn't. The array is marked as being in the "clean, degraded" > state. Which, as it is the root file system array, has the unfortunate > side effect of not allowing the RAID1 to properly assemble at boot (that > degraded state). > > So ... can I force the array to either remove the extra unneeded loop1 > device, and update its metadata properly ... or force it into a clean, > active state without the loop1 device, or force the assembly on boot to > occur regardless of what it thinks it should have? > > This is quite disconcerting ... I thought it would be simple. It is. You want the array to think that it only has two devices? mdadm --grow /dev/md0 --raid-devices=2 Done. 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
