On Sunday November 5, tandrews@xxxxxxxxxx wrote:
> Hi
>
> Why would the superblock magic be zero on a newly created RAID-1 set?
>
> I get this error when the kernel (2.6.17.7) boots:
>
> md: Autodetecting RAID arrays.
> md: invalid raid superblock magic on sda1, found 0x0 not 0xa92b4efc
> md: sda1 has invalid sb, not importing!
> md: invalid raid superblock magic on sda2, found 0x0 not 0xa92b4efc
> md: sda2 has invalid sb, not importing!
> md: invalid raid superblock magic on sdb1, found 0x0 not 0xa92b4efc
> md: sdb1 has invalid sb, not importing!
> md: invalid raid superblock magic on sdb2, found 0x0 not 0xa92b4efc
> md: sdb2 has invalid sb, not importing!
> md: autorun ...
> md: ... autorun DONE.
>
> (I modified md.c so that it prints out "found xxxx not 0xa92b4efc")
>
> I have a monolithic kernel, compiled for RAID-1.
>
> Once the system is up and running, mdadm brings up the RAID arrays fine:
>
> # cat /proc/mdstat
> Personalities : [raid1]
> md1 : active raid1 sda2[0] sdb2[1]
> 506036 blocks super 1.0 [2/2] [UU]
^^^^^^^^^
in-kernel autodetect (based on partition types FD) only works for
version 0.90 superblocks.
You mdadm to assemble the array, it is more flexible than auto-detect.
NeilBrown
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