On 13/01/20 23:34, Rickard Svensson wrote: > Hi all > > One disk in my raid 1 0 failed the other night. > It has been running for +8 years, on my server, a Debian Squeeze. 8 years old, debian squeeze, what version of mdadm is that. > (And yes, I was just about to update them, bought the HD's and everything) > Great. First things first, ddrescue all drives on to the new ones! I think recovering your data won't be too hard, so might as well back up the data on to your new drives then recover that. > I thought that i would be able to backup the data, but i got ext4 > error aswell, and when i tried to repair that with fsck i got: > " > # fsck -n /dev/md0 > fsck.ext4: Attempt to read block from filesystem resulted in short > read while trying to open /dev/md0 > Could this be a zero-length partition? > " My fu isn't good here but I strongly suspect the read failed with an "array not running" problem ... > > So i am wondering if my mdadm raid is okay. > The "State [clean|active]" and "Array State : AA.." is not so easy > to interpret, tried to read parts of the threads, but at the same time > is worried that more disks should failt... And I'm starting to get > really stressed :( All the more reason to ddrescue your disks ... > > All the disk are the same type. And apparently does not support SCT, > which I was not aware of before. > /dev/sde2 seems to be gone. > Can you check the drive in another system? Is it the drive, or is it a controller issue? The fact that the three event counts we have are near-identical is a good sign. The worry is that sde2 disappeared a long time ago - have you been monitoring the system? If you ddrescue it will it give an event count almost the same as the others? If it does, that makes me suspect a controller issue has knocked two drives out, one of which has recovered and the other hasn't ... > " > cat /proc/mdstat > Personalities : [raid10] > md0 : active raid10 sda2[0] sde2[3](F) sdc2[2](F) sdb2[1] > 5840999424 blocks super 1.2 512K chunks 2 near-copies [4/2] [UU__] > " <snip> > > > I really hope someone can help me! > https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn Note that when it says "use the latest version of mdadm" it means it - I suspect your version may be well out-of-date. Give us a bit more information, especially the version of mdadm you're using. See if you can ddrescue /dev/sde, and what that tells us, and I strongly suspect a forced assembly of (copies of) your surviving disks will recover almost everything. Cheers, Wol
