Re: [OSR-devel] Remounting New Root After Booting

[Gordan B. <go...@bo...>]

>>>>>>>>> And, obviously, I'd need to make all this happen before the normal
>>>>>>>>> boot process tries to mount the root disk.
>>>>>>>>
>>>>>>>> Do it before or right after scsi-start is called.
>>>>>>>
>>>>>>> I can't find any reference to "scsi-start". Where does this happen?
>>>>>>
>>>>>> It's scsi_start in linux.generic.sh Line 239.
>>>>>
>>>>> D'oh! What a difference an _ makes.
>>>>>
>>>>> I think the iSCSI stuff should be added before the dm_start stuff, which
>>>>> is just before the scsi_start.
>>>>>
>>>>> Right, that seems to have worked. Almost there. Now I get:
>>>>>
>>>>> Mounting LABEL=/ on /mnt/newroot..device not found error [FAILED]
>>>>> Mounting /cdsl.local on /cluster/cdsl/3..no cdsldir found
>>>>> "/mnt/mewroot//cluster/cdsl"
>>>>> Could not mount cdsl /cdsl.local to /cluster/cdsl/3. Exiting
>>>>>
>>>>> Where does it get the LABEL=/ from? I'm pretty sure I didn't set any.
>>>>
>>>> Concerning LABEL=/
>>>> I think you should check you bootloader config and change root=LABEL=/ to
>>>> root=/dev/sd.. That should do it.
>>>
>>> What files is that in?
>>
>> this is setup by your root environment. Normally in grub. There should be
>> something comparable on your pxe environment if you use it.
>> default from redhat:
>> [root@mobilix-01 ~]# cat /proc/cmdline
>> ro root=LABEL=/ rhgb quiet
>> sharedroot cluster:
>> [root@axqa03_1 ~]# cat /proc/cmdline
>> root=/dev/vg_axqa03_sr/lv_sharedroot com-step com-debug
>
> Oh, THAT root= parameter! Right. I'm feeling really stupid now. :'(

Ah, minor problem. Not a big deal, but potentially a problem nevertheless. 
If we fire up iSCSI _first_ (i.e. before normal SCSI), then the iSCSI 
drive appears as sda, and the local disk becomes sdb. Does anyone think 
this might end up being a problem? I can't immediately think of why this 
might be a problem, other than it perhaps being a little illogical to have 
the local disks listed _after_ remote disks.

I expect the solution would be to just modprobe sd_mod before starting up 
iSCSI.

Any thoughts on this?

Gordan