* RAID 5 - All superblocks gone due to MBR/GPT mishap - how do i figure out chunk size?
@ 2013-05-16 19:24 den RDC
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From: den RDC @ 2013-05-16 19:24 UTC (permalink / raw)
To: linux-raid
Hello
Due to a nasty (human) error, 4 2tb disks in raid5 have lost their
1st megabyte of data ( including superblock ). In an attempt to get
the array to a state usable enough to at least attempt data recovery,
I have been trying to re-enable the array using various chunk size and
partition start offsets, but i cant seem to get it anywhere near a
consistent state ( recovery tools only return files or pieces of files
smaller then the chunk size, indicating alignment/chunk size
inconsistencies ).
The data I do have is :
- the order of the disks
- the pretty solid assumption that all data, even parity should be
fine for most of the disk except the very beginning.
- the exact size of the MD device before it got corrupted.
Is there any way, however adventurous, to glean the missing data (
chunk size, chunk alignment/offset ) from analysis of the existing
data ?
Kind regards
den_RDC
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2013-05-16 19:24 RAID 5 - All superblocks gone due to MBR/GPT mishap - how do i figure out chunk size? den RDC
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