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

Marc Roos M.Roos at f1-outsourcing.eu
Wed Jul 11 22:48:07 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.

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.

    The resource must currently be in the Connected connection state.

Thanks in advance,

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F1 Outsourcing Development Sp. z o.o.

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