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.
You can start up only specified nodes by specifying
them in a nodelist parameter. The following
example starts up nodes n2, n3, and n5:
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 11: 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.
Log in as superuser (root) on
the head node.
Start all nodes on the system
with the startsys command:
Alternatively, you can specify a single node or
a list of nodes.
If your system has been configured for improved availability, enter
the transfer_to_avail command to transfer control
to the availability tool:
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.
Log in as superuser (root) on
the head node.
Invoke the startsys command with the --image_and_boot option:
# startsys --image_and_boot |
If your system has been configured
for improved availability and the nodes that provide availability
have been reimaged, enter the transfer_to_avail command to transfer control to the availability tool:
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.
Log in as superuser (root) on
the head node.
Invoke the startsys command with the --force and --image_and_boot options:
# startsys --force --image_and_boot node |
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