[DRBD-user] DRBD questions

Florian Haas florian.haas at linbit.com
Tue Aug 31 09:23:31 CEST 2010


On 2010-08-31 08:30, Jiann-Ming Su wrote:
> On Mon, Aug 30, 2010 at 4:19 PM, nash_nash <jigs2410 at gmail.com> wrote:
>>
>> Hi ,
>>
>> I am new to DRBD as well as Linux.
>>
>> While going through DRBD set up steps i figured that i need to create a
>> partition and mount it. And also try to allocate space for meta-data.
>>
>> My question 1) is it possible to do this on a server which is already
>> running in development mode. OR do i need to start from scratch?
>>
>> 2) Can i copy 2 directories over to redundant server for e.g. /home/xxx/yyy
>> and /opt/zzz ?
>>
>> 3) Is it possible to have the directories of different size on primary and
>> secondary server?
>>
>>
>> Please let me any other information is required .I would appreciate any
>> help/tips.
>>
> 
> First, you should understand that DRBD is network RAID-1.  It mirrors
> data over the network.  The backing device on each node can be either
> low level device like /dev/sda1 or a logical volume.  In the versions
> I'm familiar with (0.8),

There is no DRBD 0.8. It's DRBD 8.

 only one of the nodes can mount the drbd
> device as read write.

DRBD 8 can do dual-Primary. Which is not required for the vast majority
of use cases though.

http://www.drbd.org/users-guide/ is probably a good starting point.

Cheers,
Florian

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