mdadm raid1 regression

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Hello. I'm using linux 3.8.6 and mdadm 3.2.6 (from git).
I have many raid1 arrays that have data offset 2048 (metadata 1.2,
created with various mdadm versions but mostly 3.2.1 on linux 2.6.32).
If i create raid1 with never mdadm on 3.8.6 i have data offset 8192?? Why?

My problem:
Sometimes i'm doing mdadm --zero-superblock on both parts of array and
re-create it. On older systems i have no errors. On new (linux 3.8.6
and mdadm 3.2.6) i get corrupted ext3 fs and partition table. Why this
happening?
P.S. If i use mdadm 3.2.2 i get data offset 4096 that not breaks data,
but inconsistent with older versions.
P.P.S. I'm try to specify --data-offset when create array but as i see
- its ignored and data offset still have 8192).


Thanks!
--
Vasiliy Tolstov,
e-mail: v.tolstov@xxxxxxxxx
jabber: vase@xxxxxxxxx
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