Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

/dev/sdb13 174706938 976768064 401030563+ fd Linux raid autodetect

The size of that partition is 802061126 sectors. From what i read - mdadm should have placed the actual superblock somewhere inbetween 128K and 64K to the very end. This is a raid0 array. The problem that i am facing is that i need to move the superblock on another partition/drive (sda13) which is currently shifted/spaced out (basically it shrunk and i need to expand it to the size of sdb13). I need to get the exact location/dimensions, a definite 1:1 (nothing extra or less). I have tried inspecting the partition in question with dd and xxd to inspect the start/end of the superblock - but it is somewhat misleading, i do not see any pattern of mdadm specific headers to be able to identify it. So far, i have only been able to locate the UUID (bytes are reversed: 7c6afc87 it stored as 87fc6a7c) - but still cannot make out either the end or the start of mdadm headers.

Perhaps someone can point me in the right direction?

share|improve this question
add comment

1 Answer

Check out its version exactly: sudo mdadm -E /dev/sdb13

share|improve this answer
    
Version : 0.90.00 as i've already said –  XXL Oct 9 '11 at 11:05
    
You didn't say that mdadm -E works fine and shows the info, actually. –  poige Oct 9 '11 at 11:28
    
take a look at the thread's name. blatantly says "0.90", does it not? also, what do you mean by "mdadm -E works fine and shows the info, actually" - i never said it did not, huh? btw, it only shows the superblock offsets for 1.2 –  XXL Oct 9 '11 at 11:30
    
mdadm -E also should indicate offset of data and superblock in sectors. –  poige Oct 9 '11 at 11:32
    
for 1.2, not 0.90 –  XXL Oct 9 '11 at 11:32
show 2 more comments

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.