Debian stable 2.4.19 kernel with RAID1 compiled in, VIA EPIA CL1000 motherboard, 2 Maxtor DiamondMax 9 7200rpm 80Gb drives as /dev/hdb and /dev/hdc from onboard controller. I've followed the guide at: http://www.cs.montana.edu/faq/faqw.admin.py?query=Convert+Root+System+ to+Software+Raid&querytype=simple&casefold=yes&req=search which had turned up on a debian list search to try to set up the RAID1 mirror of the boot/root drive. I installed to /dev/hdb1 (/dev/hda is the CDROM and perhaps I should have changed that first). Loaded 2.2.20, got 2.4.19 sources, compiled RAID1 support into the kernel (still can't get rid of one complaint about a missing character set module but don't think that's causing any real problems), made the identical /dev/hdc1 into a somewhat smaller linux autodetect RAID format partition, mounted it as 2nd drive in a RAID1 drive using: mdadm --create /dev/md0 --level=1 --raid-disks=2 missing /dev/hdc1 which worked fine, mkfs -t ext3 /dev/hdc1, mount it to /mnt1, cp -ax / /mnt, tweak /etc/fstab ... /dev/md0 mounts fine, tweak lilo conf to boot from /dev/md0, reboot -- fine, finally come to add /dev/hdb1 into the array after resetting the partition type to autodetect RAID ... .. no go, system complains that /dev/hdb1 is mounted or that an inode is active: md: can not impport hdb1, has active inodes! md: error, md_import_device() returned -16 I assume that's because the boot is still from /dev/hdb but if so, how come the howto says this should work. Seems that nothing I do can shift this and if I set the partition back to linux I find I can't mount the drive despite rebooting as I get: mount: /dev/hdb1 already mounted or /mnt1 busy /mnt1 isn't busy (I can create a completely new mount point: no difference) and mount shows that /dev/hdb1 isn't mounted. I've tried all sorts of tweaking with lilo.conf to remove any calls to /dev/hdb but either these don't change anything, or else lilo complains that it can't install to the target (e.g. /dev/md0). I've read through the docs and man pages and done some searching around but can't find any explanations. Help of any sort, including direct pointers to what I've missed or misread, desperately needed! Chris PSYCTC: Psychotherapy, Psychology, Psychiatry, Counselling and Therapeutic Communities; practice, research, teaching and consultancy. Chris Evans & Jo-anne Carlyle http://psyctc.org/ Email: chris@psyctc.org - 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