HP IO Accelerator for BladeSystem c-Class - Manual (Page 24)

Maintenance 24
Important considerations
• If you are installing more than one dual IO Accelerator device and enabling the override parameter for
each device, be sure the motherboard is rated to provide 55W power to each slot used. For example,
some motherboards safely provide up to 75W to any one slot, but run into power constraints when
multiple slots are used to provide that much power. Installing multiple devices in this situation might
result in server hardware damage. Consult with the manufacturer to determine the total PCIe slot power
available.
• The override parameter persists in the system and enables full power draw on an enabled device even
if the device is removed and then placed in a different slot within the same system. If the device is placed
in a slot that is not rated to provide 55W of power, your server hardware could experience a power
drag.
• The override parameter is a setting for the IO Accelerator VSL software by server and is not stored in the
device. When moved to a new server, the device defaults to the 25 W power limit until an external
power cable is added or the override parameter is enabled for that device in the new server. To
determine the total PCIe slot power available for the new server, consult the manufacturer.
Enabling the override parameter
1. Use one of the following methods to determine the serial number of each device to be installed in a
compatible slot.
o Enter the fio-status command.
Sample output:
fio-status
...
Adapter: Dual Controller Adapter
Fusion-io ioDrive2 DUO 2.41TB, Product Number:F01-001-2T41-CS-0001, FIO
SN:1149D0969
External Power: NOT connected
PCIe Power limit threshold: 24.75W
Connected ioMemory modules:
fct2: SN:1149D0969-1121
fct3: SN:1149D0969-1111
In this example, 1149D0969 is the adapter serial number.
If you have multiple IO Accelerator devices installed on your system, use the fio-beacon
command to verify where each device is physically located.
o Inspect the adapter serial number labels on the IO Accelerator devices to determine the serial
numbers. However, HP recommends confirming that each serial number is an adapter serial number
by running the fio-status command. The adapter serial number label resides on the back of all
HP ioDrive Duo devices and HP ioDrive2 Duo devices. On ioDrive Duos, the serial number is
located on the PCB component that is attached to the PCIe connector.
2. Set the module parameter using the esxcfg-module command. For example:
esxcfg-module --server <server-name> iomemory-vsl -s
'external_power_override=<value>'
Where the <value> for this parameter is a comma-separated list of adapter serial numbers. For
example: