Ken Teh wrote:
> John Summerfield wrote:
>> Troy Dawson wrote:
>>> Ken Teh wrote:
>>>> I just installed a 4.5 machine and it hangs when booting at "grub
>>>> loading stage 2". Here's the strange part. It hangs only when a SCSI
>>>> disk (LVD/SE) disk is attached. SCSI card is an Adaptec 29160. When
>>>> the disk is removed, it rips right through the boot. The disk is fine
>>>> because I use the 4.5 install disk in rescue mode and I can see the
>>>> disk, mount it, and all its data is there. I tried with another disk
>>>> and I have the exact same result. I'm baffled!!
>>>>
>>>> Ken
>>>
>>> The odd's are that it's because the disks are getting re-ordered when
>>> you plug in and unplug the scsi disks.
>>>
>>> Without any disks there, grub is saying "here is my disk on (hd0,0)
>>> and away I go" And since hd0,0 is the right disk, away it goes.
>>>
>>> With the other disks there grub is saying "Well, I have two disks,
>>> (hd0,0) and (hd1,0). I'm told I need to boot off (hd0,0) and away I
>>> go" But, in reality, your main system disk is what grub thinks is
>>> (hd1,0) and so it's booting off the wrong disk.
>>
>> Ken, you can test this by getting to the grub command line and typing
>> stuff like
>> help
>> root (hd0,0)
>> root (hd1,0)
>> find
>>
>> etc etc
>>
>>
>
> Thanks to John and Troy who responded. Unfortunately, I was not able to
> resolve it. I've reinstalled grub after specifying grub's root. When I
> do this, it hangs at stage 1.5 instead of 2. I've verified it's the
> correct root by 'finding' the stage# files. I've tried fixing the order
> after reprobing and then editing the device.map file. I've disabled
> SCSI boot from the BIOS and verified that the BIOS boot order
> corresponds to the device.map order. I've even tried installing the
> machine without the SCSI card so that the SL installer does not load the
> AIC7xxx driver. All to no avail. I'm pretty sure it's something in
> grub. The system was running SL3.x with an IDE system disk and this
> external SCSI drive. All I did was reinstall it with SL4.5.
>
> Do you know if it's possible to get to the grub console at bootup but
> before it loads stage 1.5 or stage 2? If it is reordering, then I need
> a "live" (or in this case, "dead") system to verify instead of booting
> succesfully via linux rescue, then grubbing the system.
>
Boot floppy/CD
I don't recall whether the instructions are in the .info docs or on the
website, but it's fairly straightforward.
The boot CD _can_ be a floppy image burned to a CD, just use the floppy
image (which can be 2.88 Mbytes) as the boot image when running mkisofs.
(I've used the same technique to upgrade my BIOS).
--
Cheers
John
-- spambait
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