[DRBD-user] Drbd online resize with: md <-> drbd <-> lvm

Lars Ellenberg lars.ellenberg at linbit.com
Thu Jul 12 11:14:02 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Wed, Jul 11, 2012 at 10:48:07PM +0200, Marc Roos wrote:
> Our setup
> =========
>  is two server with, software raid5 -> drbd device -> lvm
> Can this be grown online or not? What is the best way to grow drbd 
> device that has on it lvm and as a backend software raid?
> We have resized a raid5 and we now need to make the extra storage 
> available on the drbd device and then in our volume group.
> Although the manual specifically says drbd needs to have lvm to grow, it 
> also states 'If the backing block devices can be grown while in 
> operation, it is also possible to increase the size of a DRBD device 
> based on these devices during operation' thus software raid???
> On the manual there is specifically mentioned that 
>     The affected resource's backing device must be one managed by a 
> logical volume management subsystem, such as LVM or EVMS.

Resizeable MD qualifies as "logical volume management subsystem"
in this context.

Feel free to add an "or sufficiently similar" to your auto-correction/
auto-completion filter in your read-documentation-submodule ;-)

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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