Dell PowerEdge 2950 Backplane - Error message: SAS B Cable Missing/. Misconfigured ???

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Dell PowerEdge 2950 Backplane - Error message: SAS B Cable Missing/. Misconfigured ???

  • We have a bunch of Dell PowerEdge 2950s, they came with an integrated Perc5i SAS RAID controller.

     

    Unfortunately the Perc5i does a kind of fake raid 10 (a span of mirrors rather than a stripe of mirrors) so we've had to get some proper raid cards instead.

     

    So now the onboard perc5i is disconnected from the backplane and disabled in the bios, and we have our new raid cards installed and connected to the backplane - all is well and they work good.

     

    However when booting the machines the bios pauses and we get an error message saying the following:

     

    " SAS B Cable Missing/. Misconfigured.

    Power down the system and connect correctly. Details for storage cabling can be found on the system information label and the Hardware Ownders Manual.

    Strike the F1 key to continue, F2 to run the setup utility"

     

    How can we stop this message? It's obviously totally wrong; our new SAS cards are connected to the backplane and working fine. I see nowhere to disable this message in the bios or BMC management utility 5.

     

    Bios version is 2.2.6 (latest)

    BMC firmware is 1.97 (latest)

    Backplane firmware is 1.05 (latest)

     

    Please help!

  • I just got an email telling me this post would be removed for using rude language!!!

     

    Please tell me which word above is vulgar???????????????????????? 

     

    I'm sorry Dell, but looks like your forum is even more sensitive than your dysfunctional BMC firmware! 

  • Message Edited by pcmeiners on 04-11-2008 11:21 AM
  • Hello Dell,

     

    Any Idea how to stop the press F1 non-error? 

  • What new SAS card do you have?
  • Also, the Perc5 creates a real RAID 10, not a fake.

    The term span, when used in the context of the Perc5, is referring to the disks in a mirror.

    Hence, when creating a Raid 10 using 6 disks, you have 3 spans of 2 disks (3 mirrors), which are then striped to create the Raid 10.

    Message Edited by snapohead on 04-15-2008 12:29 AM
  • Ok! To start with - here's my previous post, removed by dell for having a word that begins with S, ends with K and has UC in the middle! Honestly, what a waste of time!

     

    Adaptec 5805

     

    Well from what I've managed to analyze that is the case. If the Perc5i does indeed do real raid 10 then why is the write performance really bad? We get 131640 k/sec sequential block write here over 6 disks with 64k stripe.

     

    The same setup with the 5805 gives is 290554 k/sec - and thats with disk caches turned off on the 5805, as far as I could see the perc5i had no control over disk caches. These are standard bonnie++ benchmarks.
    Don't get me wrong, I'm no perc5i hater; infact raid5 performance is great, but not what we need.

     

    Okay----------------

     

    Now I've finally sorted the problem myself by pulling out the old perc5i cards, the error is gone.

     

    Also now the perc5i cards are gone we can get into the BMC bios screen with <ctrl-E> - something we never even had the option to do with the cards in, this is obvuiously another dell blunder.

     

    One things for sure - next time I'll be avoiding dell equiptment. 

  • I have the same problem itself. I needed to upgrade the HDD 3Tb on my PE 2950 server. PERC 5 does not support drives 3Tb, had to put the controller PERC H700 and now at server error is displayed:

    A SAS Cable Missing /. Misconfigured.

    Power down the system and connect correctly. Details for storage cabling can be found on the system information label and the Hardware Ownders Manual.

    Strike the F1 key to continue, F2 to run the setup utility "

    How to get rid of this error. The controller works without errors, all the tests pass.

    Any modernization server DELL - this is a big problem! All new servers that we buy - not DELL. I do not communicate with the server DELL. DELL forces not to upgrade their servers and buy new, thinking that they have a monopoly on the market :))
    Funny position.

  • Every computer and server manufacturer has design and hardware limits as well as a set of hardware they support and validate on particular models.  This is nothing new in the computer world - welcome to it.