Hello, I spent a night trying out mdadm --assemble on a virtual machine to see how it attempts to fix a raid where 2 or more drives have been marked faulty. I was quite sure that the drives were fine and that they were wrongly marked as bad. I think I just have a bad ata controller. I used --assemble on real machine and it seemed to have detected the raid again. 1 drive was found to be bad and it is recreating it now. But my data is there and I can open it. I am going to get some dvd's and back all this up before it dies again! Regards and thanks for your help! 2009/1/30 David Greaves <david@xxxxxxxxxxxx>: > Justin Piszcz wrote: >> Try to assmeble the array with --force. > hmmmm? not yet... > > >> On Thu, 29 Jan 2009, Tom wrote: >> >>> Hello, >>> >>> 2 drives have failed on my raid5 setup and I need to recover the data >>> on the raid. >>> I am sure that the drives still works or at least one of them still >>> works. >>> >>> How do I recover my drives? > > How important is it? > The more important the data the more you should reduce the risk of a subsequent > failure. > If you "don't care" then we just force it back together and cross fingers. > Otherwise we run tests on all the drives before trying a restore. > I'd say to run these tests on each drive; as a minimum do the first test on the > failed drive, more paranoia, more tests and include the non-failed drives (to > ensure they don't fail during recovery): > * smartctl -t short > * smartctl -t long > * badblocks > > What happened? Smoke? > Are the drives faulty (what does smartctl -a tell you) > Did the cables just wiggle? Is the controller broken? > You probably don't know :) > > I would obtain replacements for the failed drives and use ddrescue to copy from > the failed drive to a replacement. > Then install the good drives and begin recovery. > >>> I can't mount the raid no more and I am missing a hard drive when i >>> run ls /dev/sd? >>> I have 7 drives on my raid. > You say you have 7 drives and 2 are failed. > And yet I see 4 drives, not 5. > > Where is sdg? > >>> Here is output of /var/log/messages in following link >>> >>> http://matx.pastebin.com/m35423452 > > Jan 29 21:14:11 sda died > Jan 29 21:14:12 sdb died > >>> >>> also some more information > Also need: > Distro > Kernel version > Mdadm version > mdadm --examine for each available component. > > David > > -- > "Don't worry, you'll be fine; I saw it work in a cartoon once..." > -- 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
