Blade p-class 3U Power Enclosure Problem

[wlchik]

Hello,

I have a 3U Power enclosure with 4 PS using single-phase power input connected to 1 original server enclosure with 8x BL20p G2. Autually, I receive an error log in IML showing "Power Enclosure Power Supplies Not Redundant (in Bus Bar, Enclosure Serial Number...". And I try to check log from service port, it showing "Redundancy status: Not Redundant; Enclosure N+1 Redundant: Yes; Enclosure Redundant: Yes; Bus Bar Redundant: Yes; AC Feed Redundant: No". Is the problem caused by AC feed redundant? And how can I fix it? FW version: 2.10. Many thanks.

[raadek]

For redundant AC configuration you need 2 enclosures. I know it sounds weird, but that's the case.

You can experiment yourself with diffrent configs using HP PowerCalc:
http://h30099.www3.hp.com/configurator/calc/BL%20p-Class.xls

Rgds.

[wlchik]

Hi,

Is "AC feed redundant" means AC line redundant? Autually, it is a original enclosure, the power path is not split into side A and B, moreover, I have used the sizing utility, it shown 2 PS is required. Therefore, if 1 AC line is broken, 4 of 2 PS is still working and enough power to support 8x BL20p server. AC feed redundant should satisify. So, I don't know what is happening!!

-wlchik-

[raadek]

It is due to the fact how DC power is distributed to pClass enclosure with enhanced backplane [281404-B22]

You should be fine though if you have 1x 3U power encl. + pClass blade encl. with standard backplane [281404-B21]

See attached slides explaining the issue.

[wlchik]

So, that is the problem. The enclosure is standard (281404-B21). AC feed redundant should "yes". however, I got the result from service port is "no".

[Oleg Koroz]

What numbers you see on the Total and Consumed Power from R - Redundancy Page (service Port)
See attachment
Close to 13 servers you should not experience any errors

Two form of Redundancy in blades:
1. Between Power Enclosures
2. Between Power Supplies on the A side and B side of Actual Power Enclosure

See attachment with example of one phase Power Enclosure with two populated Blade Enclosures

How often you get them?
Can you make same screenshot?

[wlchik]

I always get this error message in IML repeatly. It shows:
Caution Power 05/10/2006 11:40 05/10/2006 11:40 1 Power Enclosure Power Supplies Not Redundant (in Bus Bar, Enclosure Address 4CBB)

Caution Power 05/10/2006 11:40 05/10/2006 11:40 1 Power Enclosure Power Supplies Not Redundant (in Power Module, Enclosure Address 4CBB)

Caution Power 05/10/2006 11:40 05/10/2006 11:38 1 Power Enclosure Power Supplies Not Redundant (in Breaker, Enclosure Address 4CBB)

[Oleg Koroz]

I looked over Power Calculator with basic Config BL20p G2
2 x 36GB 4 x 512MB
With Single CPU 2206 W
With Dual CPU 3034 W
Power calculator shows 2 Power Supply (practically what that mind 2 Per Side Installed).

1Phase Power enclosure with 208V expectation ~ 4158 W for Output
In your example: missing redundancy only per side on the Power Enclosure.
If one power supply fails you will be fine, but if one feed fails: one or two servers will go down.

You provided example of IML error there is three of them in few m minutes, but how often you see similar entry?
Additional step Update Firmware and reset management modules
http://h18023.www1.hp.com/support/files/server/us/download/24088.html