Neil, Thanks for your help. I seem to have solved the problem, but can only speculate both as to the problem and the solution. I updated to kernel 2.4.22, but it still failed to autodetect properly. I then dumped raidtools2 and went to mdadm as per your suggestion. I then generated an mdadm.conf file which I altered to refer to the partitions on the raid consistently by their devfs names rather than hde2 and hdg2. I suspect this may have been the problem. I am not sufficiently informed as to the boot process to tell for sure, but suspect that autodetection may have been having problems with devfs when the config files referred to the old device names. Whatever the reason, it is now working. regards, Darryl - 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