On Sat, 30 Aug 2008 08:30:52 Andrew Joakimsen wrote:
How do I recover a broken MD RAID-1.... Since there is no way to make a backup with easy restore? I boot the system and it says:
md: radi5 personality registered md: raid4 personality registered md: md0 stopped. md: bind<sdb1> md: bind<sda1> md: md0: raid array is not clean -- starting background reconstruction raid1: raid set md0 active with 2 out of 2 mirrors md0: bitmap file is out of date (8 < 9) -- forcing full recovery md0: bitmap file is out of date, doing full recovery md0: bitmap initialisation failed: -5 md0: failed to create bitmap (-5) md: peers -> run() failed... mdadm: failed to RUN_ARRAY /dev/md0: Input/output error mdadm: device /dev/md0 already active - cannot assemble it Trying manual resume from /dev/sdb2 Invoking userspace resume from /dev/sdb2 boot/82-resume.userspace.sh: line 48: /proc/splash: No such file or directory resume: libgcrypt version: 1.4.0 Trying manual resume from /dev/sdb2 Invoking in-kernel resume from /dev/sdb2 PM: starting manual resum from disk Waiting for device /dev/md0 to appear: ok /dev/md0: unknown volume type invalid root filesystem -- exiting to /bin/sh $
Before this system was working fine. I shut it down correctly with the 'halt' command. I plugged in a USB KVM that makes the system hang at boottime (to provide needed info for Bug # 412476) after the system hung I powered it off, unplugged the kVM and then booted it back, only to get the above messages.
First thing I would do is to mark /dev/sdb2 as failed and remove it from the array. Then try booting the array with just /dev/sdb1 as a member. Once the array is started, reassemble the array and let it rebuild the mirror. I am assuming that /dev/sdb2 is the partition with the problem - it may in fact be /dev/sdb1 (in which case do the above for /dev/sdb1). Reading man mdadm may be useful. -- =================================================== Rodney Baker VK5ZTV rodney.baker@iinet.net.au =================================================== A [golf] ball hitting a tree shall be deemed not to have hit the tree. Hitting a tree is simply bad luck and has no place in a scientific game. The player should estimate the distance the ball would have traveled if it had not hit the tree and play the ball from there, preferably atop a nice firm tuft of grass. -- Donald A. Metz