[ale] Motherboard Drives First, Please!

[Jeff Hubbs]

Sean -

Using modules for the 3ware cards is the direction I'm heading in.  I'm 
not booting to the 3wares in any case.

If I go the JBOD/SW-RAID route or a mixture of that plus HW RAID on just 
one of the cards, then it seems as though it's /dev/mdX that winds up in 
/dev/disk/by-uuid.  I'm not sure how that'll play with what I'm trying 
to do with hardware failover, i.e., slap the drives over into a second 
identical machine if the main machine's mobo craps it.

- Jeff


Sean C. McCord wrote:
> First; please don't reply with a new thread.  It messes up the nice,
> pretty threading that some of us use.  :)
>
> On Tue, Feb 10, 2009 at 12:23:15PM -0500, Jeff Hubbs wrote:
>   
>> Supermicro X7DBE+ mobo, two 3ware SAS RAID controllers and one 3ware 
>> SATA raid controller, four SATA drives on the mobo. How to make sda-sdd 
>> always be the mobo drives? I'm going to test JBODding the controllers 
>> and I want the four drives that work the OS to always appear as sda-sdd.
>>     
>
> You can force the order by making each of the driver modular and loading
> the modules in the order you want.  That, of course, means that you're
> relegated to either a initial ramdisk image or a root filesystem on the
> "first" one and build it into the kernel.
>
> A better method, however, would be to NOT use the /dev/sdX name
> references and use /dev/disk/by-id or /dev/disk/by-uuid method.  These
> will stay consistent even across controllers.
>  
>   
>> I've already tried disabling bootable flags on the controllers and 
>> fooling around with the boot order in the mobo BIOS but it's not 
>> working.  FWIW, the Gentoo LiveCD puts sda on the mobo's SATA0 like I'd 
>> expect.
>>     
>
> That is because the /dev/sdX lettering is simply a first-come,
> first-serve order by driver load.  In order words, the first disk of the
> first-loaded driver gets "sda", and so forth.
>
> --
> Sean C. McCord
>
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