URGENT: "mdadm: No md superblock detected"

parityboy

Limp Gawd
Joined
Nov 13, 2010
Messages
390
OK, this has just happened.

I have two Samsung 850 EVO 1TB drives in RAID 0. I needed to reboot the machine and when it came backup I noticed this RAID 0 didn't restart. Using mdadm -E yielded "mdadm: No md superblock detected" on both /dev/sda1 and /dev/sdb1. I've trawled the search engines but the answers are of no help. I've checked the drives and they show no errors whatsoever.

How does this happen and how can I recover the RAID?

Many thanks. :)
 
"parityboy" using raid0, just dosn't seem right.
The 0 in raid0 is for how much data you will have left when something goes wrong.

anyways what does the following give.

# cat /proc/mdstat
# mdadm --assemble --scan -v
 
Not meaning to pile on OP's misfortune, but this is a good example of why you should never RAID 0 any important volume (regardless of OS).
 
IMHO, if you didn't actually need the speed, but wanted a larger volume, LVM would probably have been a better choice.
 
When you created the mdadm, did you use --create in the original line? It's possible to assemble the array w/o actually writing the array config to the drives. I've seen a lot of people do this.
 
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