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 on). Each interconnect module has different power on 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 Superdome 2 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 Superdome 2 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 Superdome 2 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 Superdome 2 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.
Device Bays Standard tab and Double Dense tabs
The Device Bays Standard tab indicates the current settings for all the primary bays based on the
type of enclosure. To change a setting on a particular device bay, use the menu under the Enabled
column and select Enabled, Disabled or No Poweron. If Enabled is selected, a power delay in
seconds must be entered in the Delay column for this bay. The minimum value is 1 second; the
maximum value is 3600 seconds.
If double dense C-class server blades are installed in an enclosure the power delay settings for
Side A and Side B are controlled in the Double Dense Side A and Double Dense Side B tabs.
Enclosure settings
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