SCSI devices and device reordering 2006-01-11 - By Guy Waugh
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Yeehah, thanks Tom, worked like a charm...
Thanks to Greg and Rafael also.
Ciao,
Guy.
Tom Sightler wrote:
> On Wed, 2006-01-11 at 16:14 +1100, Guy Waugh wrote:
>
>>I'm thinking it is probably because of the fact that, on the 6650, the
>>megaraid SCSI controller has a Host value of 2 (from
>>/proc/scsi/megaraid), where the QLogic HBA has a Host value of 1 (from
>>/proc/scsi/qla2300) (excuse me if I've got the 'Host value' terminology
>>wrong). On the other boxes, the megaraid SCSI controller has a Host
>>value of 1, and the QLogic HBA has a Host value of 2.
>>
>>I suspect that this is quite a common problem, but I can't locate any
>>info on what to do about it (probably not using the right search terms).
>>Can I do anything about it?
>>
>>Can anyone suggest what I might do to keep the local disk as /dev/sda,
>>or point me at relevant info?
>
>
> Well, you're certainly on the right track. Basically the system is
> loading the Qlogic driver before the megaraid driver. In your simple
> case the easy answer is to simply manually reorder the drivers. To do
> this take a look in /etc/modules.conf. My guess is that, on your
> system, you will see two lines that are something like this:
>
> alias scsi_hostadapter qla2300
> alias scsi_hostadapter1 megaraid
>
> Just reverse these two like this:
>
> alias scsi_hostadapter megaraid
> alias scsi_hostadapter1 qla2300
>
> And then rebuild the initrd with a command something like:
>
> mkinitrd /boot/initrd-2 (See http://trd-2.ora-code.com).4.21-37.ELsmp.img 2.4.21-37.ELsmp
>
> Of course you may need to modify the mkinitrd command slightly if you're
> using a different kernel.
>
> Reboot, and that's it, you should have the behavior you want.
>
> Of course, you could also use LVM and device labels rather than caring
> where disks devices end up, but I understand why you might want this
> behavior.
>
> Later,
> Tom
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