Megaraid PERC 4/E is detected first, why ?

Richard Ford rford at candis.com.cn
Mon Feb 12 08:12:03 CST 2007


alias eth0 e1000
alias eth1 e1000
alias scsi_hostadapter megaraid_mbox
alias usb-controller1 uhci-hcd

Not much there... both cards use the same driver.....



On 12 Feb 2007, at 6:20 PM, Bahadir Kiziltan wrote:

> 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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>>
>>
>>
>>
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