Megaraid PERC 4/E is detected first, why ?

Bahadir Kiziltan bahadir.kiziltan at gmail.com
Mon Feb 12 04:20:31 CST 2007


Could you please post your modprobe.conf file?

cat /etc/modprobe.conf

On 2/12/07, Richard Ford <rford at candis.com.cn> wrote:
> Hmm,
>
> I have never used a PERC5 and 4 in the same system.
>
> Is this a new system install or trying to use the old data?
>
> On one server I have with 2 x PERC4 (PERC4 DC and PERC 4eDC) the external
> array came in as SDB and the internal as SDA.
>
> When I first did this though, it was reversed - but LVM picked it up and the
> system booted fine from SDB.
>
> In my case the one bios util will control both cards - maybe this is not
> possible with a PERC4 and PERC5 paired together?
>
> Are both cards in slots or is one a ROMB?  The other option is to swap the
> physical slots around so that one is read before the other by the BIOS....
>
>
>
>
> On 12 Feb 2007, at 6:04 PM, Krishna Murthy, Elangovan wrote:
>
>
> Hi Richard,
>
> Thanks for your response,
>
> Yeah we have tried with the option as you said , i have selected the PERC
> 5/i as first hard drive in the boot sequence menu and the booted with my OS
> CD , but it shows /dev/sda as External array and /dev/sdb as internal disk
> drives, And also i couldnt find the PERC bios option as you said to control
> the two cards in one instance.
> Here we have two controller bios , one for PERC 5/i ( internal SAS drive)
> and one more for external array i.e PERC 4E/DC , both have BIOS enabled
> option.
>
> Thanks,
> Elango
>
>  ________________________________
>  From: Richard Ford [mailto:rford at candis.com.cn]
> Sent: Mon 2/12/2007 1:21 PM
> To: Krishna Murthy, Elangovan
> Cc: linux-poweredge at dell.com
> Subject: Re: Megaraid PERC 4/E is detected first, why ?
>
>
> This can be done in the BIOS.  Select boot order and SCSI card order......I
> believe in the PERC bios which allows you to control the two cards in one
> instance, you can also select which card (Or virtual disk) is active for
> boot purposes...
>
>
>
> Also if you use LVM it should not matter and things will auto adjust on the
> fly.  That is how I got all to work like this with a PE1850 and PV220S....
>
>
> RF.
>
>
>
>
>
> On 12 Feb 2007, at 1:41 PM, Krishna Murthy, Elangovan wrote:
>
>
>
> Hi,
>
> We have 1950 system , in that one 5/I controller and 4 /E controller  with
> RAID-5 configuration,
>
>
>
> We are facing problem in boot sequence , without connecting to the external
> array we have already installed OS on to the internal disk drives,
>
> But we are facing problem after connecting back our external array to the
> 1950 system, show kernel panic error while booting up the OS.
>
>  Its show external RAID array as /dev/sda and internal disk drives as
> /dev/sdb,
>
> How to change the order of detection between PERC 5/I and 4/E ( external
> array ).
>
> Thanks
>
> Elango
>
>
>
>
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