Comment #15 on issue 256 by [email protected]: DRBD Volume above 4TB not working
https://code.google.com/p/ganeti/issues/detail?id=256

Linbit DRBD documentation speaks about growth operation:
https://drbd.linbit.com/users-guide/s-resizing.html

So it's more complex in case of internal metadata (need to move the metadata to the new volume end).

In case of external metadata, extend it offline seems trivial:
"When the backing block devices on both nodes are grown while DRBD is inactive, and the DRBD resource is using external meta data, then the new size is recognized automatically. No administrative intervention is necessary. The DRBD device will have the new size after the next activation of DRBD on both nodes and a successful establishment of a network connection."

Extend it online, a simple drbd resize seems to do it so not so complex.

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