HP c-Class Vmware manual Enabling PCIe power override, Command line Purpose Utility

Command line	Purpose
utility
fio-format (on page	Used to perform a low-level format of an IO Accelerator
32)
fio-pci-check (ESX	Checks for errors on the PCI bus tree, specifically for PCIe
only)	IO Accelerator devices. This utility is only supported on
	ESX.
fio-status (on page	Displays information about the device
34)
fio-update-iodrive	Updates the IO Accelerator firmware
(on page 36)

For more information on command-line utilities, see "Utilities (on page 29)."

Enabling PCIe power override

For PCIe IO Accelerators, if you have installed any dual IO Accelerator devices, such as the HP ioDrive2 Duo, then the device might require additional power than the minimum 25 W provided by PCIe Gen2 slots to properly function. Even if additional power is not required for your device, all dual IO Accelerator devices that receive additional power might benefit with improved performance.

HP ioDrive2 Duo devices must have additional power to properly function. For more information on which devices require additional power, see the HP PCIe IO Accelerator for ProLiant Servers Installation Guide.

Additional power can be provided in two ways:

•External power cable—This cable ships with all dual ioMemory devices. For information on installing this cable, see the HP PCIe IO Accelerator for ProLiant Servers Installation Guide.

NOTE: When a power cable is used, all of the power is drawn from the cable and no power is drawn from the PCIe slot.

•Enabling full slot power draw—Some PCIe slots provide additional power (often up to 75 W of power). If your PCIe slot is rated to provide at least 55 W, then you can allow the device to draw full power from the PCIe slot by setting a VSL module parameter. For more information on enabling this override parameter, see "Enabling the override parameter."

CAUTION: If the PCIe slot is not capable of providing the needed amount of power, then enabling full power draw from the PCIe slot might result in malfunction or even damage to server hardware. The user is responsible for any damage to equipment due to improper use of the override parameter. HP expressly disclaims any liability for damage arising from improper use of the override parameter. To confirm the power limits and capabilities of each slot, as well as the entire system, contact the server manufacturer. For information about using the override parameter, contact HP Customer Support.

NOTE: The override parameter overrides the setting that prevents devices from drawing more than 25 W from the PCIe slot. The parameter is enabled by device using the device serial numbers. Once the setting is overridden, each device might draw up to the full 55 W needed for peak performance.

Before you enable the override parameter, ensure that each PCIe slot is rated to provide enough power for all slots, devices, and server accessories. To determine the power slot limits, consult the server documentation, BIOS interface, setup utility, or use the fio-pci-checkcommand.

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