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Fusion-io, B200-M4: „PCIe Power over Budget“ Error

Walter Dey
VIP Alumni
VIP Alumni

I have a customer with B200-M4 and VIC1340 and one 1300GB Fusion ioMemory3 PX.

The Fusion-io card flags „PCIe Power over Budget“ Errors.

Spec Sheet for B200-M4 shows this as a certified configuration.

I found below for C-Series servers.

Q. does this apply for B-Series as well ?

 

PCIe Slots That Can Be Configured to Support More Than 25 W Power Draw: All.

All slots can support the higher device power draw of 55 W (75 W maximum) when configured with the override parameter in the IO Accelerator VSL software.

 

 

 

Enabling Higher Power-Draw for Fusion ioDrive3 Cards

Some Fusion ioDrive3 accelerator cards such as the 5800 GB card draw 25 W by default but can achieve higher performance when the PCIe slot is configured to provide more than 25 W for the device.

PCIe Slots That Can Be Configured to Support More Than 25 W Power Draw: All.

All slots can support the higher device power draw of 55 W (75 W maximum) when configured with the override parameter in the IO Accelerator VSL software.

Note See the UCS power calculator to determine the total power draw for your exact server configuration athttp://www.cisco.com/assets/cdc_content_elements/flash/dataCenter/cisco_ucs_power_calculator/

How to Enable Higher Power Draw for a Device with the IO Accelerator Override Parameter

The override parameter in the IO Accelerator VSL software (in the /usr/modprove.d/iomemory-vsl.conf file) overrides the setting that prevents devices from drawing more than 25 W from the PCIe slot. The parameter is enabled by device, by using the device serial numbers.

Note The override parameter persists in the server 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 moved to a slot that is not rated to provide 55 W of power, the server hardware could experience a power drag.

Note 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.

Step 1 Determine the serial number of the installed Fusion device by using the fio-status command in the IO Accelerator VSL software. Sample output is shown here:

fio-status

Adapter: Dual Controller Adapter

Fusion-io ioDrive2 3.0TB, 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 Fusion ioDrive3 devices installed in your system, use the fio-beacon command to verify where each device is physically located.


 

1 Reply 1

Walter Dey
VIP Alumni
VIP Alumni

FYI, TAC case information (still not resolved)

Ideally the power requirement  for fusion IO card is 25W, though for some reason the pcie slot threshold is limited to 12.75 W and ideally PCIe slot  should provide 50W.

 

So here I am not sure why the threshold is limited to 12.75 W were ideally it should give 50W, to answer this question I am involving my engineering team to look into it and provide the resolution  of our issue.

 

 

        ioMemory Adapter Controller, PN:MFIO1300MP

        Product UUID:47e83aa7-587f-57a5-ab49-6fcf9129865d

        PCIe Bus voltage: avg 12.00V

        PCIe Bus current: avg 1.10A

 

        PCIe Bus power: avg 13.15W

        PCIe Power limit threshold: 12.75W

        PCIe slot available power: unavailable

        Connected ioMemory modules:

          fct0: Product Number:MFIO1300MP, SN:1503D010E

 see also the attachment.

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