[DRBD-user] Help with initial setup

kevin kempter kevin at kevinkempterllc.com
Thu Oct 9 16:22:16 CEST 2008

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


On Oct 8, 2008, at 3:36 PM, Florian Haas wrote:

> On 10/08/2008 11:04 PM, Jerry Amundson wrote:
>> On Wed, Oct 8, 2008 at 3:33 PM, kevin kempter <kevin at kevinkempterllc.com 
>> > wrote:
>>> 1) I setup 2 new installs of CentOS v5 (32bit) as VM's via vmware  
>>> server on
>>> a Dell 2900 (quad core, 16Gram, single RAID slice, etc)
>>>
>>> Note: I created /stage as a separate ext2 filesystem (mounted from
>>> /dev/sda2). This is the filesystem I want to replicate with drbd
>>
>> That will need to be re-made on the drbd device.
>
> Wrong. If you shrink the filesystem (resize2fs) to make room for  
> DRBD's
> metadata, you will be able to replicate the existing data without
> remaking the filesystem. If you need to keep that data.
>
> After you have shrunk your filesystem (shrink by 128M to be on the  
> safe
> side), you want to do exactly what your original error message told  
> you,
> namely use "drbdadm create-md <resource>" to create your metadata.
>
> Btw: ext2, being a non-journaling filesystem, is a really bad choice  
> for
> HA environments. Use ext3.
>
> Florian
>
> -- 
> : Florian G. Haas
> : LINBIT Information Technologies GmbH
> : Vivenotgasse 48, A-1120 Vienna, Austria
>
> When replying, there is no need to CC my personal address.
> I monitor the list on a daily basis. Thank you.
>
> LINBIT® and DRBD® are registered trademarks of LINBIT.
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user


Hi All;

I'm finding no luck with anything I've tried. So I've decided to go  
back to ground zero and walk through a proper setup.  A few questions:

I've setup 2 brand new CentOS 5 VM's (via vmware server). I'm wanting  
to use internal meta-data to keep things simple.

How do I need to prepare the disk ? this far I've created a partition  
(/drbd_data) as an ext3 filesystem as part of the initial disk  
partitioning (in the CentOS install) on both servers.  Is this correct?

Also, do I need to unmount these /drbd_data file systems before  
attempting to startup drbd ?


Next steps:
1) install the drbd RPM's on both servers

2) modprobe drbd (on both servers)

3) create the /etc/drbd.conf file on both servers

4) run drbdadm create-md 'resource' on the master node

5) run drbdadm attach 'resource' on the master node

6) run drbdadm connect 'resource' on the master


Previously when I tried to run step 4 I got error messages, trying to  
use a minimal config using internal meta data

Does the above sound correct ? Am I missing anything ?

Thanks in advance





More information about the drbd-user mailing list