[DRBD-user] First time DRBD user question

Cameron Smith velvetpixel at gmail.com
Thu Mar 11 21:48:12 CET 2010

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

On Thu, Mar 11, 2010 at 10:25 AM, Brian R. Hellman <brian at linbit.com> wrote:
> Cameron Smith wrote:
>> I am preparing for my first deployment of DRBD and have a few questions.
>> My initial setup is two servers. One is a functioning server and will
>> be the primary and the second is currently not used and will be my
>> secondary.
>> The DRBD instructions say:
>> "After you have installed DRBD, you must set aside a roughly
>> identically sized storage area on both cluster nodes. This will become
>> the lower-level device for your DRBD resource."
>> What is this storage area for?
> This is where the data you want replicated will go.  So if you have
> /dev/sdb as the block device you want to replicate, you will need a
> block device of the same size on your secondary to replicate to.
>> How big does it need to be?
> However big you want it :)
>> Is this just where DRBD keeps it's own data to function or is this
>> where the actual replicated source data needs to be and where the
>> destination will go?
>> Thanks!
>> Cameron
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Thanks Brian!

So I don't need to do anything on the primary and I can use the
existing device where the data lives now as the lower-level location?
I know about the internal meta data at the end and allowing for it.

So for my secondary can I do the same with that? It has an existing OS
and different files in /etc than the primary and I want to make it
identical to the primary so in case of the primary failing the
secondary would become a live system identical to the primary.

How do I achieve this?
How do I remove the files from the secondary and populate the
secondary with matching data from the primary?

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