On Fri, Jul 25, 2014 at 12:32 PM, Benjamin Smith
<lists@xxxxxxxxxxxxxxxxxx> wrote:
> On 07/25/2014 06:56 AM, Robert Nichols wrote:
>> Unless you can figure out some way to move the start of the partition back
>> to make room for the RAID superblock ahead of the existing filesystem, the
>> answer is, "No." The version 1.2 superblock is located 4KB from the start
>> of the device (partition) and is typically 1024 bytes long.
>>
>> https://raid.wiki.kernel.org/index.php/RAID_superblock_formats
>
> Sadly, this is probably the authoritative answer I was hoping not to
> get. It would seem technically quite feasible to reshuffle the partition
> a bit to make this happen with a special tool (perhaps offline for a bit
> - you'd only have to manage something less than a single MB of data) but
> I'm guessing nobody has "felt the itch" to make such a tool.
>
>
> On 07/25/2014 08:10 AM, Les Mikesell wrote:
>> What happens if you mount the partition of a raid1 member directly
>> instead of the md device? I've only done that read-only, but it does
>> seen to work.
>>
>
> As I originally stated, I've done this successfully many times with a
> command like:
>
> mount -t ext{2,3,4} /dev/sdXY /media/temp -o rw
But if you write to it, can you clobber the raid superblock? That is,
is it somehow allocated as used space in the filesystem or is there a
difference it the space available on the md and direct partition, or
something else?
--
Les Mikesell
lesmikesell@xxxxxxxxx
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