02-28-2011 07:32 AM
Hi all,
I look after a four-node cluster (using SFWHA). We now need to move some servers into a separate network segment, so I need to split the cluster into 2 two-node clusters.
Has anyone done a checklist of things that I need to do, and things I need to check?
So far I've got:
At this point I'm not actually splitting the storage - I'll do that later.
What else am I forgetting? I've got a VCS certification, but I took it about 5 years ago!
Solved! Go to Solution.
02-28-2011 07:43 AM
Hello,
It looks like you have pretty much everything covered. The only item I see missing is changing the cluster name (so they don't match) in the main.cf as well. If you have configure the 'ClusterAddress' attribute, you'll need to change the IP there as well.
Here is an example:
cluster FileCluster01
Usernames = {admin = xxxxxx}
ClusterAddress = 192.168.0.5
Here, you would want to perhaps change the 2nd cluster to name FileCluster02, and if the ClusterAddress attribute is configured, the IP here should match the IP configured in your Cluster Service group. This is attribute is generally used for the Global Cluster Option (GCO), so there is a very good chance this attribute has NOT been configured.
Lastly, as I'm sure you are aware -- After making the changes, you will need to stop had, llt, and gab (net stop had, net stop llt, net stop gab), then restart them to pick up the config changes manually made.
Hope this helps,
rhanley
02-28-2011 07:43 AM
Hello,
It looks like you have pretty much everything covered. The only item I see missing is changing the cluster name (so they don't match) in the main.cf as well. If you have configure the 'ClusterAddress' attribute, you'll need to change the IP there as well.
Here is an example:
cluster FileCluster01
Usernames = {admin = xxxxxx}
ClusterAddress = 192.168.0.5
Here, you would want to perhaps change the 2nd cluster to name FileCluster02, and if the ClusterAddress attribute is configured, the IP here should match the IP configured in your Cluster Service group. This is attribute is generally used for the Global Cluster Option (GCO), so there is a very good chance this attribute has NOT been configured.
Lastly, as I'm sure you are aware -- After making the changes, you will need to stop had, llt, and gab (net stop had, net stop llt, net stop gab), then restart them to pick up the config changes manually made.
Hope this helps,
rhanley
03-02-2011 11:15 PM
You can run a single cluster across two subnets. As long as your LLT comms still work.
03-06-2011 09:58 AM
I am more comfortable splitting and joining clusters on Unix clusters, since all config info is held in text files. Seems Windows is a mix of Registry and text files.
This TN on how to rebuild a cluster node : http://www.symantec.com/docs/TECH49451
lists these Registry keys:
Depending on your VCS version, you can also use this TN as guideline: http://www.symantec.com/docs/TECH33036
Symantec also recommends to use lltconfig to modify llt links. It was removed in 4.3, but can be downloaded from: http://www.symantec.com/docs/TECH43662
If at all possible to keep heartbeats connected, I'd rather stick with Riaan's recommendation.
03-25-2011 04:30 AM
In the end I decided to implement Riaan's solution, as it makes things much simpler.
I'll give the points to rhanley though, as he/she answered the question and thought of a few things I'd forgotten about.
Thanks all!