Thanks for that Aaron,
I'm looking at this again after a hiatus.
you will want to use a VIP address instead of the IP address of just 1
node.
Can this be done without Pacemaker? The reading I've done so far is
all in relation to using Pacemaker. I can alias an IP on either node
but I'm unclear on how to 'move' the Virtual IP from node 1 to node 2
and back without implementing Pacemaker etc.
Now after adding the third remote site I am planning on implementing
Pacemaker/fencing - perhaps I should be looking at going both together?
I must confess that when I see messages about split brains I get a
littler nervous about the reliability. It seems that allowing multiple
primaries actually can make the set up less robust. Maybe I'm missing
something and properly set up with fencing/stonith? is the way to go.
I'm pretty new to all this and there is much reading to do so I
apologise in advance if this is a silly question.
*Paul O’Rorke*
Tracker Software Products
[email protected] <mailto:[email protected]>
http://www.tracker-software.com/downloads/
On 9/27/2013 10:26 AM, Aaron Johnson wrote:
Paul,
That config looks right, however you will want to use a VIP address
instead of the IP address of just 1 node. This IP will move between
the 2 local nodes to whichever node is active, otherwise if when the
node with the IP in the local resource is down you will not get
updates to the stacked offsite node.
Also be aware of private vs. public IP space and how the IPs may
appear when NAT comes into play and which IPs need to appear where in
the config. I avoid this by having my 2 locations connected by VPN so
all addresses are direct, no NAT.
Aaron
On 9/26/2013 4:06 PM, Paul O'Rorke wrote:
Thanks for that Aaron,
I'm looking at this page
http://www.drbd.org/users-guide/s-three-nodes.html and not quite sure
I understand how to merge this with my current config. Currently I
have 5 resources using Protocol C on my 2 node local cluster.
For the sake of this set up I will consider the set up one of these
resources with a third node using a stacked resource and protocol A
then hopefully once that is working I can apply this to the other
resources.
In the example provided it appears that I need to define all three
resources in the one .res file. I have the following 2 config files:
*/etc/drbd.d/global_common.conf*
global {
usage-count yes;
}
common {
protocol C;
}
and
*/etc/drbd.d/restored.res*
resource restored {
device /dev/drbd2;
disk /dev/VirtualMachines/restored;
meta-disk internal;
on kvm-srv-01 {
address 192.168.2.41:7789;
}
on kvm-srv-02 {
address 192.168.2.42:7789;
}
}
can I just tack something like this onto the end of
*/etc/drbd.d/restored.res*?
resource restored-U {
net {
protocol A;
}
stacked-on-top-of restored {
device /dev/drbd10;
address 192.168.3.41:7788;
}
on buckingham {
device /dev/drbd10;
disk /dev/hda6;
address <fixed IP at backup node>:7788; # Public IP of the backup node
meta-disk internal;
}
}
I am also wondering, since I have a spare NIC on my local nodes,
would I be better to use that to connect to my off site resource or
use the LAN connected NIC? In the example above I used a different
subnet for the off site and called the off site machine 'buckingham'.
I hope my question makes sense, still finding my feet here.
Please and thanks
*Paul O’Rorke*
Tracker Software Products
[email protected] <mailto:[email protected]>
On 9/25/2013 2:21 PM, Aaron Johnson wrote:
Yes you can add the stacked resource later, I have done this same thing several
times now by making the the device slightly larger first and using internal
metadata.
Also I have a DR site using protocol C and pull-ahead enabled without using
DRBD proxy. The main site and DR site are connected via cable modem
connections (10Mbit up/ 20 down both sides). The only thing I have troubles
with is if I need to add a large amount of data (50+ GB), which in my case is
fairly rare (daily norm is ~2GB), then it can take days or weeks to sync up
fully again. Also I used truck-based updates for the initial setup of ~1TB to
avoid having to pull all that over the internet link.
Thanks,
AJ
On Sep 25, 2013, at 7:54 AM, Lionel Sausin<[email protected]> wrote:
Le 25/09/2013 08:10,[email protected] a écrit :
The purpose you are talking about, sounds more as the purpose DRBD Proxy has
been developed for
www.linbit.com/en/products-and-services/drbd-proxy
Yes and no, my understanding is that DRBD-proxy lets your production cluster
run faster than the connection speed by acting like a write cache.
But if I'm not mistaken you still need a stacked configuration for 3 node
setups until v9.0 is released.
Someone please correct me if that's wrong of course.
Lionel Sausin
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