I had the same problem and a quick look at the kernel shows that although the ioctl for generating the fault exists in the kernel, the main part is commented out and therefore the operation is a noop. This is true for the 2.4.19 and at least the beginning of the 2.5.* kernels. If you want to use raidhotgenerateerror you need to edit a few kernel files. Claudio on Thu, 19 Dec 2002 15:38:32 +0200 Jarmo =?iso-8859-1?Q?J=E4rvenp=E4=E4?= <Jarmo.Jarvenpaa@softers.net> wrote: > - 3 RAID 1 devices with each having 2 partitions mirrored together. > - Kernel 2.4.20 > > I tried to remove /dev/hda1 from /dev/md0 by using raidhotgenerateerror > and got this: > ---------------------------------------------------------------------------- Claudio Fleiner claudio@fleiner.com - 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