[DRBD-user] DRDB on one host

Arnold Krille arnold at arnoldarts.de
Tue May 13 20:07:58 CEST 2014

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

On Tue, 13 May 2014 09:57:21 +1200 Csanad Novak
<csanad at pixelfusion.co.nz> wrote:
> Recently on the latest AWS Summit I’ve seen an interesting setup for
> utilising the AWS EC2 instance storage. The instance storage is the
> local filesystem on the Amazon cloud, unfortunately it is not
> persistent - all data get lost if the instance stops. For persistent
> storage one must use an so called EBS volume, which is a network
> attached block device. Unfortunately the EBS storage performance is
> varies, depending on the neighbour instances’ traffic. An ideal world
> one can use the instance storage without the worry of data loss.
> On the latest AWS Summit a presenter proposed an architecture where
> the instance storage was utilised and was synced with DRBD to the EBS
> block
> device. http://www.slideshare.net/AmazonWebServices/so-you-think-you-are-an-aws-ninja-dean-samuels -
> slide 11.
> I wonder how an example config would looks like. I went trough
> quickly on the tutorials, but couldn’t find any example with one host
> setup.

drbd on one host. Isn't that what raid/md is?

I haven't had a chance to play with aws but if both ebs volumes and the
instance-storage are block devices, it should be easy to mirror them
with md or lvm.

- Arnold
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