I have a cluster with 5 nodes:
- 3 gnbd clients and
- 2 gnbd servers
our gnbd clients have the following IPs:
192.168.113.{3,4,5}
our gnbd servers have the following IPs:
192.168.113.{6,7}
Our gnbd servers 192.168.113.{6,7} are exporting different block devices,
let's say: shd1_hdb1 from server1 and shd2_hdc1 from server2
All our clients 192.168.113.{3,4,5} are importing booth devices:
[root@rs1 ~]# ls /dev/gnbd
shd1_hdb1 shd2_hdc1
[root@rs2 ~]# ls /dev/gnbd
shd1_hdb1 shd2_hdc1
[root@rs3 ~]# ls /dev/gnbd
shd1_hdb1 shd2_hdc1
On our client nodes /dev/gnbd/shd1_hdb1 and /dev/gnbd/shd2_hdc1 are forming a
LVM mirrorored volume which on top is using gfs.
Question1: in cluster.conf, for our gnbd servers is correct to use the same
fencing method like the one used for our client nodes or should be used
manual fencing?
For example, for node 4 and 5 is correct to have:
<clusternode name="192.168.113.6" nodeid="4" votes="1">
<fence>
<method name="first_fence_method_for_this_node">
<device name="gnbd_from_shds" nodename="192.168.113.6"/>
</method>
</fence>
</clusternode>
<clusternode name="192.168.113.7" nodeid="5" votes="1">
<fence>
<method name="first_fence_method_for_this_node">
<device name="gnbd_from_shds" nodename="192.168.113.7"/>
</method>
</fence>
</clusternode>
Question2: Our gfs logical volume should be defined as quorum disk or is
enough to increase votes on node 4 and node 5 (our gnbd servers) from
votes="1" to votes="2"?
Here comes my current cluster.conf:
<?xml version="1.0"?>
<cluster alias="httpcluster" config_version="32" name="httpcluster">
<fence_daemon clean_start="0" post_fail_delay="0"
post_join_delay="3"/>
<clusternodes>
<clusternode name="192.168.113.5" nodeid="1" votes="1">
<fence>
<method
name="first_fence_method_for_this_node">
<device name="gnbd_from_shds"
nodename="192.168.113.5"/>
</method>
</fence>
</clusternode>
<clusternode name="192.168.113.4" nodeid="2" votes="1">
<fence>
<method
name="first_fence_method_for_this_node">
<device name="gnbd_from_shds"
nodename="192.168.113.4"/>
</method>
</fence>
</clusternode>
<clusternode name="192.168.113.3" nodeid="3" votes="1">
<fence>
<method
name="first_fence_method_for_this_node">
<device name="gnbd_from_shds"
nodename="192.168.113.3"/>
</method>
</fence>
</clusternode>
<clusternode name="192.168.113.6" nodeid="4" votes="1">
<fence/>
</clusternode>
<clusternode name="192.168.113.7" nodeid="5" votes="1">
<fence/>
</clusternode>
</clusternodes>
<cman/>
<fencedevices>
<fencedevice agent="fence_gnbd" name="gnbd_from_shds"
servers="192.168.113.6 192.168.113.7"/>
<fencedevice agent="fence_manual" name="manual_f"/>
</fencedevices>
<rm>
<failoverdomains/>
<resources/>
</rm>
</cluster>
Regards,
Alx
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