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14.6.3 Remote Power Management Structure


14.6.3 Remote Power Management Structure
Remote power management for the SPARC M12/M10 is controlled per the remote power management group.

Of the host nodes in a group, the host nodes with the remote power management function enabled are targeted for remote power management. The power supply status of a remote power management group is determined depending on the host node status in the group.
  1. On status
    When the status of the power supply of any one of the host nodes in the remote power management group is on
  2. Off status
    When the status of the power supplies of all host nodes in the remote power management group is off
 
This section describes remote power-on and power-off management structures based on the following settings.
Table 14-14  Remote Power Management Structure (Example)
Setting Item Host Node#0 Host Node#1 Host Node#2 I/O Node#0 I/O Node#1
Remote management setting Disable Enable Enable Setting disabled Setting disabled
Master node Yes No Yes Setting disabled Setting disabled
Mechanism of Interlocking When Powering On
If any of the host nodes in a remote power management group is powered on, then all of the host nodes, subnodes, and I/O nodes in the group are powered on. Host nodes are powered on, followed by I/O nodes.
Note - You can set a time for host nodes to wait until I/O node devices are accessible. Use the setpowerupdelay command of the XSCF firmware to make the setting. For details, see "4.2.1  Setting/Checking the Warmup Time."
If you do not set the wait time, the system may fail to start when a host node attempts to access an I/O node device that is inaccessible.
In addition, if I/O nodes are switched or the setting is changed, the time to access the devices changes. So, the devices may not be accessed when a host node attempts to access one.
If you have switched I/O nodes or changed the setting, use the setpowerupdelay command to set a new wait time.
Remote Power-off Management Structure
All the host nodes in a remote power management group are powered off, followed by all the I/O nodes in the group.
Remote Power Management by Wake on LAN
Generally, the target nodes of the remote power management function of the SPARC M12/M10 are the hosts and I/O devices on which a controller is mounted. The controller allows IPMI communication even while the power of the hosts and I/O devices is turned off.
When all of the following conditions are satisfied, those devices on which such a controller is not mounted can also remotely manage power using the remote power management function of the SPARC M12/M10.
- Wake on LAN is supported.
Power-on is performed with Wake on LAN.

- IPMI communication can be performed.
After power-on using Wake on LAN, IPMI communication through the LAN is used for performing power-off and obtaining the power state.

- They are connected to the network on the same subnet as XSCF-LAN#0 of the master host node or XSCF-LAN#0 and XSCF-LAN#1 of the master host node.
Note - A host node where Wake on LAN is set cannot become a master node.
Note - Wake on LAN cannot be set for the SPARC M12/M10 chassis. Therefore, Wake on LAN cannot be used to power on the SPARC M12/M10 chassis.
Note - The Wake on LAN setting varies depending on the node. See the manuals for each node.
Interlocking at the Failure Recovery Time
If a node in a remote power management group cannot communicate when recovered from a failure or other problem, operation is as follows.
  1. In the case of an I/O node failure
    If the power supply status of a remote power management group is on, the master host node issues an instruction to power on.
  2. In the case of host node failure
    Even if the power supply status of a remote power management group is on, the master host node does not issue an instruction to power on.