On Fri, Oct 16, 2009 at 01:54:10PM -0400, Chris Ball
wrote:> Hi,
>
> I installed btrfs to one disk using the Fedora 12 installer; it
> doesn''t allow any configuration of the mkfs command by the user,
> so it wasn''t possible to mkfs with more than one disk.
>
> I''d like to add a second disk, with either RAID0 or RAID1 between
> the two -- the equivalent of "mkfs.btrfs -m raid0/1 -d raid0/1
> /dev/sda /dev/sdb". Is it possible to create this non-destructively
> now? If not, should it be? What would the implementation look like?
It''s not very complex, you can take a look at how we upgrade from
single spindle dup to RAID1 for metadata when a second disk is added.
Basically once we have a block group with the new type we''re able to
force new allocations to the new raid level. btrfs-vol -b does the
rest.
-chris
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