HP Onboard Administrator - Manual (Page 104)

Configuring the HP BladeSystem c7000 enclosure and enclosure devices 104
Enclosure Status: Degraded
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Device Power Sequence Device Bays tabs
The enclosure power delay feature controls the order in which components are powered on if the entire
enclosure has been power cycled. This feature is only enabled during the active HP BladeSystem Onboard
Administrator boot process if the Onboard Administrator detects that the entire enclosure has been power
cycled and power delay has been enabled on at least one component in the enclosure.
The active HP BladeSystem Onboard Administrator displays a message in the system log when power delay
has been initiated, and also displays a message in the system log when power delay has completed after the
longest power delay has passed. The HP BladeSystem Onboard Administrator factory default setting is to
disable power delay for all components.
Typical use cases involving bay to bay dependencies that can be resolved by enabling the enclosure power
delay feature include:
• Boot from network—Network interconnects must complete power on self test prior to servers that are
configured to boot from the network (for example, PXE or iSCSI).
• Boot from SAN—SAN interconnects must complete power on self test prior to servers that are
configured to boot from SAN
• Critical service dependencies controlled by a server such as DHCP or licensing
• Storage servers must be operational prior to servers requiring those resources
The delay time setting must be determined empirically since some dependencies are outside the enclosure
(boot from SAN might require additional delay to enable the datacenter SAN storage system to power up).
Each interconnect module has different power up timing before it is operational.
The timer used for power delay is started at the time the Onboard Administrator enters the first system log
message during Onboard Administrator initialization indicated by the system log message Kernel:
Network link up. When the HP BladeSystem Onboard Administrator indicates PowerDelay has been
initiated for the selected devices in the system log, the configured delay times for each bay are
used to determine when that component is turned on. After the selected delay time has elapsed, that
component is turned on.
Valid settings for each bay are: Disabled, Enabled and No Poweron.
Disabled—Disables powerdelay for this bay. HP BladeSystem Onboard Administrator grants power to this
bay based on its power settings: for a device configured to auto power-on, the device is granted power
following an enclosure power cycle after all the Onboard Administrator configuration checks are complete.
Enabled—Enables powerdelay for this bay. HP BladeSystem Onboard Administrator turns on this bay based
on the number of seconds elapsed following the detection of an enclosure power cycle event.
No Poweron—Prevents component power on for the bays with this configuration until after the HP
BladeSystem Onboard Administrator logs PowerDelay has completed for the selected devices.
At this time, if the device is configured to auto power-on, the device grants power following an enclosure
power cycle after all the Onboard Administrator configuration checks are complete.
If the device is configured to disable auto poweron, the device remains off following an enclosure power
cycle independent of the setting of power delay for that bay.