My RAID5 works fine, all data is there, it is active. But when I do mdadm --examine it says no superblock detected on /dev/md0. FC 15
 

Im running Fedora Core 15
Kernal is 2.6.43.8-1 (If im reading this right)

Any help is greatly appreciated. My Raid5 is working fine but that superblock error is making me afraid lol...thanks!

you ARE aware that fedora 15 is and has been long deceased ( R.I.P.)
it went End Of Life back in June of 2012
there have been NO security updates for if for almost 4 YEARS

-- DO NOT USE!!! --

please stay current and install Fedora 23
then in about 90 days reinstall with fedora 24

Superblock version mismatch? Dunno.

Which device are you missing the superblock on?

Replacing the '[x]' with the different drive letters.

Thanks but yes I already knew this. My data has been backed up for years and I don't use this box at all. I am installing Centos 7 this weekend, but I am trying to get this Superblock thing figured out first

/dev/md0

When I check the individual drives here is what I get:

[jpwhite@bigboy ~]$ sudo mdadm --examine /dev/sd[a,b,c]1 /dev/sdd|more
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : a50c2820:498b65cc:07e97bdd:32b75e83
Name : bigboy:0 (local to host bigboy)
Creation Time : Thu Nov 10 00:15:06 2011
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 3907021954 (1863.01 GiB 2000.40 GB)
Array Size : 5860531200 (5589.04 GiB 6001.18 GB)
Used Dev Size : 3907020800 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 1abdcd92:7155e78f:84266601:d2ebd1e1

Update Time : Fri Feb 26 13:34:36 2016
Checksum : 5c3c0fe - correct
Events : 1005610

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing)
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : a50c2820:498b65cc:07e97bdd:32b75e83
Name : bigboy:0 (local to host bigboy)
Creation Time : Thu Nov 10 00:15:06 2011
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 3907021954 (1863.01 GiB 2000.40 GB)
Array Size : 5860531200 (5589.04 GiB 6001.18 GB)
Used Dev Size : 3907020800 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 800619cd:1881b903:be3d0d65:ad908fa3

Update Time : Fri Feb 26 13:34:36 2016
Checksum : d945f21a - correct
Events : 1005610

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 1
Array State : AAAA ('A' == active, '.' == missing)
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : a50c2820:498b65cc:07e97bdd:32b75e83
Name : bigboy:0 (local to host bigboy)
Creation Time : Thu Nov 10 00:15:06 2011
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 3907024896 (1863.01 GiB 2000.40 GB)
Array Size : 5860531200 (5589.04 GiB 6001.18 GB)
Used Dev Size : 3907020800 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : d5e415bd:599aed91:8be75d02:4799ebf2

Update Time : Fri Feb 26 13:34:36 2016
Checksum : 4423a79a - correct
Events : 1005610

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : a50c2820:498b65cc:07e97bdd:32b75e83
Name : bigboy:0 (local to host bigboy)
Creation Time : Thu Nov 10 00:15:06 2011
Raid Level : raid5
Raid Devices : 4

Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
Array Size : 5860531200 (5589.04 GiB 6001.18 GB)
Used Dev Size : 3907020800 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : d2950ed4:455d2a17:ceddb7d9:3be2d982

Update Time : Fri Feb 26 13:34:36 2016
Checksum : 47a16369 - correct
Events : 1005610

Layout : left-symmetric
Chunk Size : 512K

Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing)

then there is NO problem

this would be fixed when you reformat the drives to install CentOS 7.2

installing a new OS solves the issue

I have the OS on a different drive so I won't be formatting the RAID. My OS is currently on a separate drive. There's a chance Centos would fix it but I would like to try everything I can do beforehand to get rid of that error. I already did e2fsck -b 32768 /dev/md0 but that didn't fix it. I haven't tried to re assemble it yet either.

Version mismatch? .90 and 1.2???

Perhaps...Im getting to the point where imma just do the reinstall and let er rip lol

The output doesn't show any issues. I agree with just install installing C7 and be done with it.