Hi, Today, after running a SuSE 9.0 PC with software RAID1 for several days, i have issued: 'dmesg | grep md' The last lines of the output gave me something to worry about: md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27 md: Autodetecting RAID arrays. md: autorun ... md: considering hde1 ... md: adding hde1 ... md: adding hdc1 ... md: created md0 md: bind md: bind md: running: <hde1><hdc1> md: hde1's event counter: 00000004 md: hdc1's event counter: 00000004 md: RAID level 1 does not need chunksize! Continuing anyway. kmod: failed to exec /sbin/modprobe -s -k md-personality-3, errno = 2 md: personality 3 is not loaded! md :do_md_run() returned -22 md: md0 stopped. md: unbind md: export_rdev(hde1) md: unbind md: export_rdev(hdc1) md: ... autorun DONE. Trying to free ramdisk memory ... okay md: autorun ... md: considering hde1 ... md: adding hde1 ... md: adding hdc1 ... md: created md0 md: bind md: bind md: running: <hde1><hdc1> md: hde1's event counter: 00000004 md: hdc1's event counter: 00000004 md: RAID level 1 does not need chunksize! Continuing anyway. md: raid1 personality registered as nr 3 md0: max total readahead window set to 508k md0: 1 data-disks, max readahead per data-disk: 508k raid1: raid set md0 active with 2 out of 2 mirrors md: updating md0 RAID superblock on device md: hde1 [events: 00000005] md: hdc1 [events: 00000005] md: invalid raid superblock magic on md0 md: md0 has invalid sb, not importing! md: no nested md device found md: ... autorun DONE. md: Autodetecting RAID arrays. md: could not import hde1! md: could not import hdc1! md: autorun ... md: ... autorun DONE. EXT3 FS 2.4-0.9.19, 19 August 2002 on md(9,0), internal journal I ran the following commands: mdadm --examine /dev/md0 gave me: No Superblock found on /dev/md0 ... hdparm -T /dev/md0 spitted out: ... 1212 MB/sec (nothing to worry about) the 'cat /proc/mdstat' was: Personalities : [raid1] read_ahead 1024 sectors md0 : active raid1 hde1[1] hdc1[0] 156280192 blocks [2/2] [UU] unused devices: <none> The system is has been running without any problems. I admit that i'am a bit confused. Should i pay attention to the last lines of 'dmesg' or the message can be ignored. I have checked the output on another PC (similar setup with SuSE 9.0). The output was the same. It seems (at least for me) that there are some issues with raidtools. Any clue ? Thanks Zvone Zagar