On Thursday May 1, jeremyhu@uclink4.berkeley.edu wrote: > I wanted to remove /dev/hdk6 from my array and replace it with a new > drive at /dev/hdj6 (I know about the efficiency problems involved with > this, but trust me that this is what I want to do for some other > reasons), so I did the following: > > mdadm -f /dev/md6 /dev/hdk6 > mdadm -r /dev/md6 /dev/hdk6 > mdadm -a /dev/md6 /dev/hdj6 > > The RAID reonsctucted itself, and it was working fine, so I rebooted the > machine and removed the /dev/hdk hard drive from my computer. When > linux started up again, I checked /proc/mdstat, and it said that the > RAID was running in degraded mode without /dev/hdj6. At a guess, I would say that you are depending on in-kernel auto-detect to assemble your arrays, and you haven't set the partition type of hdj6 to "Linux Raid Autodetect" NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html