Re: alignment of metadata 1.2 and mkfs.ext4

[Robin Hill <robin@robinhill.me.uk>]

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On Wed Jul 06, 2011 at 10:52:34AM +0100, Tyler J. Wagner wrote:

> On Wed, 2011-07-06 at 15:20 +0600, Roman Mamedov wrote:
> > On Wed, 06 Jul 2011 08:11:16 +0100
> > "Tyler J. Wagner" <tyler@tolaris.com> wrote:
> > 
> > > Metadata 1.2 puts the data 4K from the start of the device/partition.
> > 
> > This is not correct. See mdadm -E /dev/sdX.
> > 
> > $ sudo mdadm -E /dev/sdc3
> > /dev/sdc3:
> > ...
> >         Version : 1.2
> > ...
> >     Data Offset : 2048 sectors
> > ...
> 
> That is very interesting. The mdadm man page, and everything I've seen
> online, all say "The different sub-versions 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)."
> 
That's the RAID superblock at 4K, not the data.

Cheers,
    Robin
-- 
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    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
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