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тАО10-03-2007 02:43 AM
тАО10-03-2007 02:43 AM
Redundant midplane in a Blade System
Have any document for this issue?
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тАО10-03-2007 03:47 AM
тАО10-03-2007 03:47 AM
Re: Redundant midplane in a Blade System
"I" don't think this has been achieved (yet!!) by HP.
Regards,
James.
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тАО10-03-2007 09:55 AM
тАО10-03-2007 09:55 AM
Re: Redundant midplane in a Blade System
Also, unlike our major competitor, we do not route power through the signal midplane--it is a separate plane--basically a solid copper bar for + and a solid copper bar for -.
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тАО10-04-2007 08:26 PM
тАО10-04-2007 08:26 PM
Re: Redundant midplane in a Blade System
The failure rate is really exaggerated, when the main focus should actually be in the active components that are really more prone to failure. These are the power supplies, the fans, the disks, all of which are more vital parts that will eventually be the causes of downtime of any blade solution. And time and time again, it has been proven that those are really the components that you need to look out for if your worry is blade downtime.
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тАО10-26-2007 03:49 AM
тАО10-26-2007 03:49 AM
Re: Redundant midplane in a Blade System
HP's midplane is really just a bunch of cables in the form of a PCB with connectors on it. How often do high quality cables go bad? Think about it.
IBM's midplane has tons of active components (things like processors capacitors etc) that heat up, cool down and might break and potentially take part of the enclosure down with it. What IBM touts as being 'redundant' about their midplane is that each blade system has 2 connectors to the midplane which they claim makes it redundant.
Sadly this is not the case as if you lose one connector to the midplane you could lose half of your connections to your I/O equipment or lose enough power to shut your server down!
In this particular instance (a midplane) more parts is not necessarily better!
Even aside from this whole marketing standpoint the C7000 really blows away any offerings by IBM if you ask me.
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тАО03-02-2008 08:49 AM
тАО03-02-2008 08:49 AM
Re: Redundant midplane in a Blade System
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тАО03-02-2008 11:08 AM
тАО03-02-2008 11:08 AM
Re: Redundant midplane in a Blade System
the "silver bullet" of the non-redundant backplane is not a "silver bullet". IBMs backplane is active, those of HP is passive. Just some plastic with some connectors. :) I've heard that only <4% of the blade enclosures in the market (p- and c-Class) died with a defective back-plane. But I saw 2 of 16 IBM blade enclosures dying with a defective backplane within two years. Any questions? ;)
Best regards,
Patrick
Patrick
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тАО03-02-2008 11:19 AM
тАО03-02-2008 11:19 AM
Re: Redundant midplane in a Blade System
A midblade in a bladesystem is called such because there are things that plug into both the "front" side (blade servers, storage blades, tape blades, etc) and the "back" side (ethernet switches, fiber switches, management switches, infiniband switch, etc).
Since its more or less in the middle of the chassis they have taken to calling it a midplane.
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тАО03-03-2008 01:16 AM
тАО03-03-2008 01:16 AM
Re: Redundant midplane in a Blade System
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тАО03-28-2008 02:18 AM
тАО03-28-2008 02:18 AM
Re: Redundant midplane in a Blade System
- enclosure has some bays without blade and blanks and there is much dust in room
- when installation people remove the mid plane to decrease weight of enclosure and then they not properly reinsert it.
It's very important not to insert blades if midplane is not aligned. To check the alignment of the midplane is often useful to see if the 4 rear thumbscrews are all properly closed in a 90├В┬░ angle.
Remember: If the midplane is not correctly inserted extract blades 7cm before correcting its alignment.