On 22/04/2016 01:27, Roland Kammerer wrote:
On Fri, Apr 22, 2016 at 12:41:59AM +1000, Adam Goryachev wrote:
On 22/04/2016 00:20, Roland Kammerer wrote:
On Thu, Apr 21, 2016 at 11:54:05PM +1000, Adam Goryachev wrote:
Hi,
I've setup a few DRBD9 machines as a storage cluster with 4 nodes, plus one
"satellite" node.
I was wondering how I can access the content on the various DRBD volumes
>from the rest of the cluster?
That has nothing to do with satellite or not.
If you specified a deployment count while creating the volume
(new-volume -d) the volume gets automatically deployed on a set of "best"
nodes. If you did not, you have to assign (assign-resource) to one or
multiple nodes. Then you get a /dev/drbdXYZ on that nodes and use it as
any drbd resource.
Otherwise, what exactly is the point of a Satellite node which is a pure
client (ie, no local storage)? What does it add to the DRBD structure?
- it has no local storage, so it accesses the drbd data via the
network,it is a "drbd client".
- it accesses the drbdmanage control volume, which is a drbd resource
itself, and where the cluster information is stored, via TCP/IP. The
reason satellites exist is that currently a drbd volume is limited to
32 nodes. As the cluster information is stored on a drbd volume, that
would limit the whole cluster to 32 nodes. That is avoided with
satellite nodes that get their cluster configuration via TCP/IP, so
you can keep adding a lot more than 32 nodes to you cluster.
Hi,
Thanks for the quick response. That is really my question though. I have
a DRBD Client, ie, no local storage, receiving the drbdmanage control
volume via tcp/ip, but how do I mount the DRBD volume? eg, on the node
which has the data locally, I can simply mount /dev/drbd101 /mnt, but
now I want to do something similar from the DRBD client machine (not at
the same time, not dual primary, just one node at a time should use the
volume).
Regards,
Adam
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