Hi all, I've been fighting with my raid array (imsm - raid10) for several weeks now. I've now replaced all four drives in my array as the constant rebuilding caused a smart error to trip on the old drives; unfortunately mdadm is still resyncing the array at every boot. One thing I would like to clarify is does mdadm need to disassemble the array before reboot. At this point, I can't tell if my system is currently doing this. Googling around it seems some say that this step is unnecessary. I've managed to update initramfs to 3.2.1 and the local system to 3.2.1 but the problem still persists. The last thing my system does is remount root ro, which it does successfully. However, at the next start: [ 12.657829] md: md127 stopped. [ 12.660652] md: bind<sdc> [ 12.660939] md: bind<sdb> [ 12.661212] md: bind<sda> [ 12.661282] md: bind<sdd> [ 12.664972] md: md126 stopped. [ 12.665284] md: bind<sdd> [ 12.665383] md: bind<sdc> [ 12.665476] md: bind<sdb> [ 12.665568] md: bind<sda> [ 12.669218] md/raid10:md126: not clean -- starting background reconstruction [ 12.669221] md/raid10:md126: active with 4 out of 4 devices [ 12.669241] md126: detected capacity change from 0 to 1000210432000 [ 12.678356] md: md126 switched to read-write mode. [ 12.678390] md: resync of RAID array md126 [ 12.678393] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. [ 12.678395] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for resync. [ 12.678399] md: using 128k window, over a total of 976768256 blocks. and cat /proc/mdstat shows it resyncing: # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] md126 : active raid10 sda[3] sdb[2] sdc[1] sdd[0] 976768000 blocks super external:/md127/0 64K chunks 2 near-copies [4/4] [UUUU] [==>..................] resync = 12.2% (119256896/976768256) finish=100.7min speed=141865K/sec md127 : inactive sdd[3](S) sda[2](S) sdb[1](S) sdc[0](S) 9028 blocks super external:imsm unused devices: <none> When it resyncs it is fine until the next power down. Some other details: # mdadm --detail-platform Platform : Intel(R) Matrix Storage Manager Version : 9.6.0.1014 RAID Levels : raid0 raid1 raid10 raid5 Chunk Sizes : 4k 8k 16k 32k 64k 128k Max Disks : 7 Max Volumes : 2 I/O Controller : /sys/devices/pci0000:00/0000:00:1f.2 (SATA) Port0 : /dev/sda (WD-WCAYUJ525606) Port1 : /dev/sdb (WD-WCAYUJ525636) Port2 : /dev/sdc (WD-WCAYUX093587) Port3 : /dev/sdd (WD-WCAYUX092774) Port4 : - non-disk device (TSSTcorp CDDVDW SH-S203B) - Port5 : - no device attached - # mdadm --detail --scan ARRAY /dev/md/imsm0 metadata=imsm UUID=ec239ccc:22b7330b:0c4808ff:82dd176b ARRAY /dev/md/HDD_0 container=/dev/md/imsm0 member=0 UUID=f61f87fc:1e85f04b:59e873c5:0afdb987 # ls /dev/md HDD_0 HDD_0p1 HDD_0p2 HDD_0p3 HDD_0p4 imsm0 Everything seems to be working. Also, I can't reproduce the results in Windows Vista x64 (dual-boot.) When I go from linux -> Windows, Windows detects the array as bad and reinitializes it as well, but if I reboot into Windows the array survives without being marked bad. Can anyone shed some light on this? I've been bashing my head on my desk for too long and have run out of ideas. Dan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html