[DRBD-user] Lower device already claimed error

Arnold Krille arnold at arnoldarts.de
Wed Jul 11 22:19:35 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 11.07.2012 22:12, Digimer wrote:
> On 07/11/2012 04:07 PM, Arnold Krille wrote:
>> On 11.07.2012 21:20, Digimer wrote:
>>> I would guess so, but you know your system better than us. I can't see
>>> any reason though why you would want to use a single RAID member as a
>>> DRBD device... Using the RAID device makes a lot more sense.
>> What if someone uses one leg of an software-raid1 as a disk for drbd on
>> machine a and mounts the physical device of the same drbd on machine b?
>> From the don't-do-this-at-home-department,
> You simply couldn't. The device would be a member of the array and,
> thus, DRBD will refuse to use it, as Lin has seen. Forcing the issue
> would be kind of like having one person pushing the gas and brakes on a
> car while another person steered, with no real coordination between the
> two.
> As the kids say these day, "you'll have a bad time".

So, once again I forgot to add the funny-markers...

On a serious note, if I remember correctly drbd saves its "this is a
drbd-device" information at the end of the partition (if at all), so
when you plug the disk into a different machine and just want to access
the data, its the same as with md (with metadata=0.99): Just mount the

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