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07-08-2015 02:11 PM
07-08-2015 02:11 PM
How does the Onboard Administrator calculate power?
Tristan had a question on how the OA calculates enclosure power.
******************
Hello,
Can someone explain how the OA calculates the enclosure power capacity to be 7400W in an enclosure with 6 x 2250W and AC redundancy mode set ?
The customer also indicates that the power capacity reported by the OA is correct when the blades are in stand-by.
It shows 6750W (3 x 2750W) with the servers in stand-by.
It changes to 7400W when the blades are powered on one by one.
Showall extracts are copies below.
Thank you,
Tristan
>SHOW ENCLOSURE POWER_SUMMARY
Enclosure Bay Output Allocation:
Bay Power Allocated (Watts DC)
------------- --------------------------
Devices 6520
Interconnects + 380
Fans + 500
-------
= 7400
Enclosure Output Power Summary:
Enclosure Watts DC
---------------- --------
Power Capacity 7400
Power Allocation - 7400
Power Available = 0
Enclosure Input Power Summary:
Enclosure Watts AC
----------------- --------
Present Power 3170
Max Input Power 8998
Dynamic Power Cap Not Set
Power Limit Not Set
Device Bay Power Summary:
% Minimum Power
Power Cap Power Power Cap Allocated
Bay Name (Watts DC) Cap (Watts DC) (Watts DC)
--- ------------------- ---------- ----- ---------- ----------
1 xxxxxxxxxxxxxxxxxxx N/A N/A 206 395
2 xxxxxxxxxxxxxxxxxxx N/A N/A 210 395
3 xxxxxxxxxxxxxxxxxxx N/A N/A 211 410
4 xxxxxxxxxxxxxxxxxxx N/A N/A 208 402
5 xxxxxxxxxxxxxxxxxxx N/A N/A 208 401
6 xxxxxxxxxxxxxxxxxxx N/A N/A 209 408
7 xxxxxxxxxxxxxxxxxxx N/A N/A 206 387
8 xxxxxxxxxxxxxxxxxxx N/A N/A 209 400
9 xxxxxxxxxxxxxxxxxxx N/A N/A 218 424
10 xxxxxxxxxxxxxxxxxxx N/A N/A 213 411
11 xxxxxxxxxxxxxxxxxxx N/A N/A 217 422
12 xxxxxxxxxxxxxxxxxxx N/A N/A 219 427
13 xxxxxxxxxxxxxxxxxxx N/A N/A 216 408
14 xxxxxxxxxxxxxxxxxxx N/A N/A 213 409
15 xxxxxxxxxxxxxxxxxxx N/A N/A 214 414
16 xxxxxxxxxxxxxxxxxxx N/A N/A 212 407
---------- ---------
= 3389 = 6520
Interconnect Bay Power Summary:
Bay Name Power Allocated (Watts DC)
--- -------------------------------- --------------------------
1 HP VC Flex-10/10D Module 75
2 HP VC Flex-10/10D Module 75
3 HP VC 8Gb 20-Port FC Module 40
4 HP VC 8Gb 20-Port FC Module 40
5 HP VC Flex-10/10D Module 75
6 HP VC Flex-10/10D Module 75
-------
= 380
Fan Power Summary:
Total Fans Fan Rule Present Power Power Allocated
(Number of Fans) (Number of Fans) (Watts DC) (Watts DC)
---------------- ---------------- -------------- ---------------
10 10 180 500
>SHOW ENCLOSURE POWERSUPPLY ALL
Power Supply #1 Information:
Status: OK
AC Input Status: OK
Output Capacity: 2250 Watts DC
Current Power Output: 440 Watts DC
Serial Number: 5A22B0FHLW12PX
Product Name: HP BladeSystem c-Class P/S
Part Number: 412138-B21
Spare Part Number: 411099-001
Product Ver: 01
Diagnostic Status:
Internal Data OK
Device Failure OK
Power Cord OK
Power Supply #2 Information:
Status: OK
AC Input Status: OK
Output Capacity: 2250 Watts DC
Current Power Output: 440 Watts DC
Serial Number: 5A22B0FHLW12PT
Product Name: HP BladeSystem c-Class P/S
Part Number: 412138-B21
Spare Part Number: 411099-001
Product Ver: 01
Diagnostic Status:
Internal Data OK
Device Failure OK
Power Cord OK
Power Supply #3 Information:
Status: OK
AC Input Status: OK
Output Capacity: 2250 Watts DC
Current Power Output: 440 Watts DC
Serial Number: 5A22B0FHLW12QE
Product Name: HP BladeSystem c-Class P/S
Part Number: 412138-B21
Spare Part Number: 411099-001
Product Ver: 01
Diagnostic Status:
Internal Data OK
Device Failure OK
Power Cord OK
Power Supply #4 Information:
Status: OK
AC Input Status: OK
Output Capacity: 2250 Watts DC
Current Power Output: 440 Watts DC
Serial Number: 5A22B0FHLVY0F9
Product Name: HP BladeSystem c-Class P/S
Part Number: 412138-B21
Spare Part Number: 411099-001
Product Ver: 01
Diagnostic Status:
Internal Data OK
Device Failure OK
Power Cord OK
Power Supply #5 Information:
Status: OK
AC Input Status: OK
Output Capacity: 2250 Watts DC
Current Power Output: 440 Watts DC
Serial Number: 5A22B0FHLW12QI
Product Name: HP BladeSystem c-Class P/S
Part Number: 412138-B21
Spare Part Number: 411099-001
Product Ver: 01
Diagnostic Status:
Internal Data OK
Device Failure OK
Power Cord OK
Power Supply #6 Information:
Status: OK
AC Input Status: OK
Output Capacity: 2250 Watts DC
Current Power Output: 440 Watts DC
Serial Number: 5A22B0FHLW12QM
Product Name: HP BladeSystem c-Class P/S
Part Number: 412138-B21
Spare Part Number: 411099-001
Product Ver: 01
Diagnostic Status:
Internal Data OK
Device Failure OK
Power Cord OK
Power Subsystem:
Status: OK
Power Mode: Redundant
Redundancy State: Redundant
Power Capacity: 7400 Watts DC
Present Power: 3171 Watts AC
Onboard Administrator #1 information:
Product Name : BladeSystem c7000 Onboard Administrator
Part Number : 412142-B21
Spare Part No.: 414055-001
Serial Number : O985MP5849
UUID : 09O985MP5849
Manufacturer : HP
Firmware Ver. : 4.30 Jul 08 2014
Hw Board Type : 0
Hw Version : B1
Loader Version: U-Boot 1.1.1 (Nov 15 2010 - 10:00:47)
>SHOW POWER
Power Mode: Redundant
Dynamic Power: Disabled
Set Power Limit: Not Set
Power Capacity: 7400 Watts DC
Power Available: 0 Watts DC
Power Allocated: 7400 Watts DC
Present Power: 3171 Watts AC
Power Limit: 8998 Watts AC
******************
Dan answered:
******************
Max Input power is 9000 which is 2250 x 4
So perhaps you are set in Power Supply Redundancy mode (N+1) and not AC Redundant (N+N)
But N+1 with 4 would indicate you have 5 PSUs online which doesn’t match your 6 below.
Anytime you see DC, that’s internal power and not wall power.
Anytime you see “Allocation” that’s how much the chassis thinks it could draw if every component went to 100% at the same time.
So this section is key:
Enclosure Bay Output Allocation:
Bay Power Allocated (Watts DC)
------------- --------------------------
Devices 6520
Interconnects + 380
Fans + 500
-------
= 7400
So that says your blades think they could, combined, consume 6520W if they all went crazy.
Interconnects would take 380
Fans would take 500 (50W x 10 Fans)
Because 7400 is more than 6750 (2250x3), you would not have been allowed to power on Blade 16 and probably not 15 either.
So someone changed the Power Redundancy mode to N+1 which changes the allocation maximum, and then the last 2 blades come up.
This is not a bad thing, because there seems to be a wild swing between actual usage of a normal blade server and what we consider the Max/Allocation to be.
For instance, when you ran the commands, here is your actual usage:
Enclosure Input Power Summary:
Enclosure Watts AC
----------------- --------
Present Power 3170
So you can see from the wall, including some loss due to AC/DC conversion, you are only drawing 3170 which is way less than 6750 and means you are still technically N+N redundant.
But back to what I said before, either my math is off, or one of your power supplies is.
Actually, I wonder now if they are deregulating the number automatically.
5 PSUs (N) x 2250 = 11,250
In North America, you are only supposed to use 80% of that consistently (you can spike higher)
11250 * 0.80 = 9000
So perhaps you don’t have only 5, you have 6 and the OA is doing the 80% rule automatically for you.
Because you showed below you most definitely have 6 and they are all online.
Hope that helps explain some of these numbers.
Thanks,
Dan