is automount affecting root device? huh?

is automount affecting root device? huh?

[Tom Oehser]

Hi-

I have 2 raid-5 arrays, one is md software raid running on a Highpoint
1540, the other one is a Mylex Acceleraid-250 hardware scsi raid card.

Lilo is working fine to boot from the Mylex.  But, if I have the md on
the Highpoint autodetected, and if it doesn't have a /etc/fstab entry,
it seems to screw up the kernel's root device!?!

That is, if LILO has:

boot = /dev/rd/c0d0
disk = /dev/rd/c0d0
BIOS = 0x80
image = /2.6.7b
  label = 2.6.7b2
  append = "nmi_watchdog=2 reboot=cold parport=0x378,7"
  read-only
  root = /dev/rd/c0d0p1

and there is no:

# /dev/md1        /mnt/md1      ext3      defaults        0 0

line, it fails when it tries to mount the root filesystem.

BUT, if I add either:

 raid=noautomount

_or_

 the fstab line that mounts it on /mnt/md1

it seems to work fine...

Is the mount code ignoring the "root = /dev/rd/c0d0p1", seeing the
autodetected raid, and deciding to magically mount it as root...?

-Tom

Re: is automount affecting root device? huh?

[Brad Campbell]

Tom Oehser wrote:
> Hi-
> 
> I have 2 raid-5 arrays, one is md software raid running on a Highpoint
> 1540, the other one is a Mylex Acceleraid-250 hardware scsi raid card.
> 
> Lilo is working fine to boot from the Mylex.  But, if I have the md on
> the Highpoint autodetected, and if it doesn't have a /etc/fstab entry,
> it seems to screw up the kernel's root device!?!
> 

While I was using Highpoint 1540's with an autodetected raid 5 on these with the boot drive on hda, 
I had to use ide=reverse to make the machine boot from the "correct" drive. Changing the 1540's out 
for Promise SATA 150 TX4 controllers made this problem go away.

I never really investigated it any further
Regards,
Brad

Re: is automount affecting root device? huh?

[Tom Oehser]

But, the other drive is a scsi controller- and lilo does the right thing-
and surely it isn't confusing 'root = /dev/rd/c0d0p1' with '/dev/md1'...

Anyway, it seems to do the right thing *if* I have an fstab entry, *or*
I force it with "raid=noautomount" from lilo.conf.

-Tom