[Nottingham] Large disks and storage (md raid)

Martin martin at ml1.co.uk
Thu Sep 10 20:53:27 UTC 2009

> ... md raid1/raid10f2/raid5 :)

Which comes to another question... :-)

 From "man 8 mdadm":

"Use the new version-1 format superblock. This has few restrictions. The 
different subversion store the superblock at different locations on the 
device, either at the end (for 1.0), at the start (for 1.1) or 4K from 
the start (for 1.2)."


Why would you want the raid superblock to be 4k from the start?

And for the sake of ssd/stripe alignment, how big is the superblock?

Why not simply have the superblock at the end (v1.0)?

Are the later versions actually later versions or just variations for 
the sake of moving the superblock around?


Martin Lomas
martin at ml1.co.uk

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