Filter
Top Products
414 Administering cluster functionality
Cluster initialization and configuration
When an error occurs, such as when a check on a slave fails or a node leaves the
cluster, the error is returned to the utility and a message is sent to the console
on the master node to identify on which node the error occurred.
vxconfigd daemon
The VxVM configuration daemon, vxconfigd, maintains the configuration of
VxVM objects. It receives cluster-related instructions from the kernel. A
separate copy of vxconfigd runs on each node, and these copies communicate
with each other over a network. When invoked, a VxVM utility communicates
with the vxconfigd daemon running on the same node; it does not attempt to
connect with vxconfigd daemons on other nodes. During cluster startup, the
kernel prompts vxconfigd to begin cluster operation and indicates whether it
is a master node or a slave node.
When a node is initialized for cluster operation, the vxconfigd daemon is
notified that the node is about to join the cluster and is provided with the
following information from the cluster monitor configuration database:
■ cluster ID
■ node IDs
■ master node ID
■ role of the node
■ network address of the vxconfigd daemon on each node (if applicable)
On the master node, the vxconfigd daemon sets up the shared configuration
by importing shared disk groups, and informs the kernel when it is ready for the
slave nodes to join the cluster.
On slave nodes, the vxconfigd daemon is notified when the slave node can join
the cluster. When the slave node joins the cluster, the vxconfigd daemon and
the VxVM kernel communicate with their counterparts on the master node to
set up the shared configuration.
When a node leaves the cluster, the kernel notifies the
vxconfigd daemon on all
the other nodes. The master node then performs any necessary cleanup. If the
master node leaves the cluster, the kernels select a new master node and the
vxconfigd daemons on all nodes are notified of the choice.
The vxconfigd daemon also participates in volume reconfiguration as
described in “Volume reconfiguration” on page 413.
vxconfigd daemon recovery
In a cluster, the vxconfigd daemons on the slave nodes are always connected
to the vxconfigd daemon on the master node. If the vxconfigd daemon is