HP XC System Software Administration Guide Version 3.1

Figure 3-1 Transition of Node States
A node that does not require imaging is powered on in the POST state, enters the Booting state when it
is booting, and is in the Available state when it is ready for use in the HP XC system.
A node that requires imaging is considered to be in the Raw_Off state until it is powered on. Then it enters
the POST state. When the node is imaged, it is in the Imaging state. After completing imaging, the node
enters the Boot_Ready state and is returned to the POST state. When the node is booting, the node is in
the Booting state. It enters the AVAILABLE state when it is ready for use.
A node that fails to image is returned to the Raw_Off node from the Image_Fail state.
A node that fails to boot is placed in the Boot_Fail state. Depending on the number of retries, it is placed
in the Boot_Ready state and returns to the POST state to attempt booting again.
3.2 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:
• Nodes that provide essential system services. This group is booted first.
• All other nodes.
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 10: Distributing Software Throughout the System
(page 129).
50 Starting Up and Shutting Down the HP XC System