Starting Up the HP XC System

The startsys command implements system startup by booting nodes in the sequence essential for the system to function. The startsys command boots the system nodes in two groups:

	Note: Nodes that are disabled either as a result of a critical service configuration failure or with the setnode --disable command cannot be started with the startsys command until they are enabled with the setnode --enable command.

You can start up only specified nodes by specifying them in a nodelist parameter. The following example starts up nodes n2, n3, and n5:

# startsys n[2-3,5]

The startsys command has a number of command-line options, along with corresponding environment variables and configuration file options, that influence its behavior. One such option is the --max_at_once= n option, which enables you to limit the number of nodes that you turn on at a time, decreasing the power surge.

In addition to booting the nodes, you have the option to image the nodes, that is, to synchronize key software on the nodes with the golden image, a centralized collection of software for the nodes. The golden image and software distribution are discussed in Chapter 8: Distributing Software Throughout the System.

For additional information about the startsys command, see startsys(8).

The following sections provide procedures for starting nodes that do not need imaging, for imaging and starting nodes, and for restarting a node to image it.

Starting All Nodes

The following procedure describes the steps necessary to start the HP XC system from the head node. In this procedure, all the enabled nodes that do not require imaging are booted. “Disabling and Enabling a Node” describes how nodes are enabled and disabled.

1. Log in as superuser (root) on the head node.

2. Start all nodes on the system with the startsys command:

   # startsys

   Alternatively, you can specify a single node or a list of nodes.

For additional information on options that affect booting, see startsys(8).

Determining Which Nodes Require Imaging

The startsys command features a --test option, which returns a list of nodes that require imaging, as shown here:

# startsys --test Enabled nodes: n[9-16] Removing the execution node: n16 Boot hierarchy of specified nodes is: n15 n[9-14] Nodes that require imaging - use --image_and_boot -> n[13-14] Test completed. startsys process exiting with code 0 #

Imaging and Starting Nodes

The following procedure describes the steps necessary to start the HP XC system from the head node. In this procedure, all the enabled nodes that need imaging are imaged, then the enabled nodes are booted.

1. Log in as superuser (root) on the head node.

2. Invoke the startsys command with the --image_and_boot option:

   # startsys --image_and_boot

For additional information on options that affect imaging, see startsys(8).

Restarting a Node for Imaging

The following procedure describes how to image and boot a node that is already running. In this instance, the node needs to be imaged to accommodate a recent update to the golden image.

1. Log in as superuser (root) on the head node.

2. Invoke the startsys command with the --force and --image_and_boot options:

   # startsys --force --image_and_boot node