I take it from your post the drives are not partitioned, and the RAID array consists of raw disk members? First, check the superblocks of the md devices: `mdadm --examine /dev/sda`, etc. If 2 or more of the superblocks are corrupt, then that's your problem. If not, then it should be possible to get the array mounted one way or the other. Once you get the array assembled again, then you can repair it, if need be. Once that is done, you can repair the file system if it is corrupted. Once everything is clean, you can mount the file system, and if necessary attempt to recover any lost files. > -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of Rick Bragg > Sent: Friday, December 25, 2009 9:13 PM > To: Linux RAID > Subject: Re: fsck problems. Can't restore raid > > On Fri, 2009-12-25 at 21:47 -0500, Rick Bragg wrote: > > On Fri, 2009-12-25 at 20:33 -0500, Rick Bragg wrote: > > > Hi, > > > > > > I have a raid 10 array and for some reason the system went down and I > > > can't get it back. > > > > > > during re-boot, I get the following error: > > > > > > The superblock could not be read or does not describe a correct ext2 > > > filesystem. If the device is valid and it really contains an ext2 > > > filesystem (and not swap or ufs or something else), then the > superblock > > > is corrupt, and you might try running e2fsck with an alternate > > > superblock: > > > e2fsck -b 8193 <device> > > > > > > I have tried everything I can think of and I can't seem to do an fsck > or > > > repair the file system. > > > > > > what can I do? > > > > > > Thanks > > > Rick > > > > > > > > > More info: > > > > My array is made up of /dev/sda, sdb, sdc, and sdd. However they are > > not mounted right now. My OS is booted off of /dev/sde. I am running > > ubuntu 9.04 > > > > mdadm -Q --detail /dev/md0 > > mdadm: md device /dev/md0 does not appear to be active. > > > > Where do I take if from here? I'm not up on this as much as I should be > > at all. In fact I am quite a newbe to this... Any help would be greatly > > appreciated. > > > > Thanks > > Rick > > > > > Here is even more info: > > # mdadm --assemble --scan > mdadm: /dev/md0 assembled from 2 drives - not enough to start the array. > > # mdadm --assemble /dev/sda /dev/sdb /dev/sdc /dev/sdd > mdadm: cannot open device /dev/sdb: Device or resource busy > mdadm: /dev/sdb has no superblock - assembly aborted > > Is my array toast? > What can I do? > > Thanks > Rick > > -- 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
