[Gluster-users] 3.6: Migrate one brick's data to multiple remaining bricks

[Iain Milne]

> if you don't want glusterfs to migrate your data, there's always an
option --
> force for remove-brick, which will remove brick without data migration.
So, you
> will be able to backup/transfer/move data yourself, before reformatting
to zfs.
> I'm actually prefer to migrate data myself, since glusterfs does not
have much
> control over the migration process (only status command is available).

If the migration was done manually, the users would lose access to 1/3rd
of their data while it happened (?), and that wouldn't go down too well
:-)

The volume itself is backed up (incrementally) on a nightly basis.

>
>
> On Fri, Jan 16, 2015 at 12:59 PM, Iain Milne <glusterfs at noognet.org> wrote:
>
>
> 	We're using 3.6 with three servers; one brick each in a (100TB+)
> 	distributed volume. They all use XFS.
>
> 	We'd like to move to ZFS, without user interruption.
>
> 	Is it as simple (with 3.6) as issuing the remove-brick command for the
> 	first server, waiting for its data to migrate to the other two
> 	(automatically?), reformatting as ZFS, then adding the brick again.
> Rinse
> 	and repeat for the other two servers?
>
> 	Any two servers currently have enough capacity to hold the data from
> all
> 	three.
>
> 	I've struggled to find much documentation on this, except for the
> 	following snippet which came from
> 	https://github.com/gluster/glusterfs/blob/release-3.6/doc/release-
> notes/3.6.0.md
>
> 	"Prior to 3.6, volume remove-brick <volname> CLI would remove the
> brick
> 	from the volume without performing any data migration. Now the
> default
> 	behavior has been changed to perform data migration when this
> command is
> 	issued."
>
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