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RP8400 SPOF

 
Telefonica OSI
Occasional Advisor

RP8400 SPOF

Hi guys.
Got a couple rp8400, with a server expasion unit each.
Two questions:
1: Any SPOF, other than the system backplane in the rp8400?
2: Does adding the extension unit, add any new SPOF?
We got four hard partitions, and are wondering if any hardware failure in one of the "main" partitions (the ones with the IO controlled by the server), or any other element of the server, could lead to a failure on the partitions whith the IO controlled bye the SEU.
3 REPLIES 3
Michael Steele_2
Honored Contributor

Re: RP8400 SPOF

Dear Javier:

1) There are three single points of failure in a single dome cabinet, which is why HP does not recommend that you do failover in the same cabinet. These are the system clock, the system backplane and the power monitor.

If you want to configure a cluster with no "single point of failure" then you will need to use a complex consisting of two cabinets.

2) If you're using hard partitions then I believe the only possible SPOF would exist during a firmware upgrade, when all nPars have to come down.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=204339
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Telefonica OSI
Occasional Advisor

Re: RP8400 SPOF

Michael,
Thanks for your answer.
You are on the right direction. Our system has 4 hardware partitions, and some of them are in cluster with another rp8400 on a remote site.
Some folk here, years ago, made comments about that in an rp8400 configured with 4 npars, there was a chance that a hard failure on one of the "local" npars (the ones that have the I/0 out of the SEU) could lead to a failure on both the npars with I/O assigned to the SEU.
He's not here anymore, and we can't remember what he based his assertion on. Now we are on the task of making some new distribution on the system, and though we couldn't find much more on the manuals than what you pointed at (thanks again), we were trying to make sure.
Anybody else has some light to shed on this?
Michael Steele_2
Honored Contributor

Re: RP8400 SPOF

Hi Again Javier:

The SEU is the cabinet acronym for an rp8400, ( something expansion unit). Refer to these forum threads for some interesting SPOF comparisons between and rp8400, a superdome SD32 and a V2600 ( I/O performance ).

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=431621&admit=-682735245+1165330135162+28353475

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=230047&admit=-682735245+1165330875531+28353475
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