White Papers

Diagnostics VRTX Chassis
Problem: Dynamic Power Supply Engagement (DPSE) is enabled, but none of the PSUs display in the
Standby state.
A. Resolution: There is insufficient surplus power. One or more PSUs are moved into the
Standby state only when the surplus power available in the enclosure exceeds the capacity
of at least one PSU.
B. Resolution: DPSE cannot be fully supported with the PSUs present in the enclosure. To
check if this is the case, use the Web interface to disable the Dynamic Power Supply
Engagement feature, and then enable the feature. A message is displayed if DPSE cannot
be fully supported.
Problem: Inserted a new server into the enclosure with sufficient PSUs, but the server does not
turn on.
A. Resolution: Check the system input power cap setting. The power cap might be configured
too low to allow any additional servers to be turned on.
B. Resolution: Check that the server model, iDRAC version and BIOS are supported on the
chassis in question.
C. Resolution: Check the maximum power conservation setting. If this is set, servers are
allowed to turn on. For more details, see the power configuration settings.
D. Resolution: Check the server slot power priority of the slot associated with the newly-
inserted server, and make sure it is not lower than any other server slot power priority.
E. Resolution: While not power related, check that the fabric of the I/O mezzanine cards
are correct for the chassis configuration. If the I/O mezzanine card does not match the
chassis configuration, the server will not be allowed to turn on. Remove or replace any
I/O mezzanine card that does not match the chassis configuration and try again.
Problem: A subset of servers lost power after an AC Grid failure, even when the chassis was
operating in the AC Redundancy configuration with four PSUs.
 Resolution: This can occur if the PSUs are improperly connected to the redundant AC grids
at the time the AC grid failure occurs. The AC Redundancy policy requires that the top two
PSUs be connected to one AC Grid, and bottom two PSUs to be connected to the other AC
Grid. If two PSUs are improperly connected, such as PSU3 and PSU4 are connected to the
incorrect AC grids, an AC grid failure results in the loss of power to the least-priority
servers.
Problem: The least-priority servers lost power after a PSU failure.
 Resolution: This is expected behavior if the enclosure power policy was configured to No
Redundancy. To avoid a PSU failure in future, causing servers to turn off, make sure that
the chassis has at least three PSUs and is configured for the Power Supply Redundancy
policy to prevent PSU failure from impacting server operation.
Problem: Overall server performance decreases when the ambient temperature increases in the
data center.
 Resolution: This can occur if the System Input Power Cap is configured to a value that
results in an increased power requirement by fans having to be made up by reduction in
the power allocation to the servers. User can increase the System Input Power Cap to a
higher value that allow for additional power allocation to the fans without an impact on
server performance.
Problem: Server is unable to turn on and have unsupported Server on the Chassis.
 Resolution: This is because the Server inserted in the chassis is not supported on the
chassis, or the firmware version of the Server is not compatible with the VRTX Chassis. It is