Megaraid PERC 4/E is detected first, why ?

Patrick_Boyd at Dell.com Patrick_Boyd at Dell.com
Mon Feb 12 09:13:22 CST 2007


Actually you should have a megaraid_sas driver for the PERC 5,
megaraid_mbox is just for the older PERC cards. 

-----Original Message-----
From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of Richard Ford
Sent: Monday, February 12, 2007 8:12 AM
To: Bahadir Kiziltan
Cc: linux-poweredge-Lists
Subject: Re: Megaraid PERC 4/E is detected first, why ?

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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