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I'm getting superblock errors on one of the drives in my RAID 5 array.
There are 4 drives in the SATA array
So I tried to "heal" sdb (the affected drive) with e2fsck -b 8193 /dev/sdb and I even tried the other locations . After I did this it still gave me superblock errors after I tried to reassemble the arrary.
I have checked sdb for bad blocks with mkfs -c, no bad blocks (drives are under 6 months old.
the result of the mdadm assemble is :
ubuntu@ubuntu:~$ sudo mdadm --assemble /dev/sda /dev/sdb /dev/sdc /dev/sdd
mdadm: no recogniseable superblock on /dev/sdb
mdadm: /dev/sdb has no superblock - assembly aborted
I have formatted (fdisk) /dev/sdb hoping to create a superblock of some sort so that I can re-assemble the array but I still get "no superblock" error? Why is this if I create a filesystem on the drive? (I've done mkfs.ext3 /dev/sdb several times and I see the progress etc)
There is something wrong with your setup. It's strange that you're creating array with whole drives and not partitions.
I am using RAID 1 and never used RAID 5, but things should be quite similar. You should first start your array with survived disks and then try to add a new drive (/dev/sdb). But where is your sda drive? RAID 5 can't work if you lost 2 drives...
Superblock is created at the moment of RAID creation. It will be recreated when you add drive to array which is up and running.
lanart: I think you're right IIRC, you can't make array's out of physical
drives. I wonder if I'm not formatting with fdisk correctly , setting up the RAID flags on sdb? (sda seems fine btw, gparted seems to act bizzare on the 7.10 live disk I'm using to rescue the system).
juu801: I tried sudo mdadm --assemble /dev/md0 /dev/sda /dev/sdc /dev/sdd
no recogniseable superblock on /dev/sda
mdadm: /dev/sda has no superblock - assembly aborted