Megaraid driver not detecting RAID volumes in kernel 2.6.22?

Megaraid driver not detecting RAID volumes in kernel 2.6.22?

[Chuck Ebbert]

https://bugzilla.redhat.com/show_bug.cgi?id=288421

When running Fedora on a Dell 2950 w/ integrated LSI Perc5i (megaraid), the
system will not boot after upgrading to 2.6.22.  The boot message indicates the
system is somehow seeing through RAID, cannot access logical volume.  This
causes the root device to be unavailable and the kernel to panic.

Version-Release number of selected component (if applicable):
I experience this problem with kernel 2.6.22 and higher.  I do not believe it is
isolated to FC6, as I downloaded the stock 2.6.22 kernel from kernel.org and was
able to reproduce.

How reproducible:
Every time.

Steps to Reproduce:
1. Configure RAID10 (I've also tried RAID5) on a Perc5i in this system.

2. Load Fedora Core.  The installer works fine since the kernel version it uses
has a working LSI driver.

3. Upgrade to 2.6.22 kernel image (in yum) or download kernel.org sources,
compile, and install.

4. Reboot system.  It comes up unable to boot.  The kernel panics.
  
Actual results:
As the system boots, it cannot mount the root device.  Also in the output we see
all 6 disks separately, when they should be showing up as one logical volume.

RE: Megaraid driver not detecting RAID volumes in kernel 2.6.22?

[Bagalkote, Sreenivas]

> 
> https://bugzilla.redhat.com/show_bug.cgi?id=288421
> 
> When running Fedora on a Dell 2950 w/ integrated LSI Perc5i
(megaraid), the
> system will not boot after upgrading to 2.6.22.  The boot message
indicates the
> system is somehow seeing through RAID, cannot access logical volume.
This
> causes the root device to be unavailable and the kernel to panic.
> 
> Version-Release number of selected component (if applicable):
> I experience this problem with kernel 2.6.22 and higher.  I do not
believe it is
> isolated to FC6, as I downloaded the stock 2.6.22 kernel from
kernel.org and was
> able to reproduce.
> 
> How reproducible:
> Every time.
> 
> Steps to Reproduce:
> 1. Configure RAID10 (I've also tried RAID5) on a Perc5i in this
system.
> 
> 2. Load Fedora Core.  The installer works fine since the kernel
version it uses
> has a working LSI driver.
> 
> 3. Upgrade to 2.6.22 kernel image (in yum) or download kernel.org
sources,
> compile, and install.
> 
> 4. Reboot system.  It comes up unable to boot.  The kernel panics.
> 
> Actual results:
> As the system boots, it cannot mount the root device.  Also in the
output we see
> all 6 disks separately, when they should be showing up as one logical
volume.

Could a standard MPT driver (non-RAID) be loading on this controller?
During the reboot, can you see megaraid driver loading at all? Or do you
see mpt_scsi driver?

Before upgrading, can you blacklist this controller in pci hotplug? I
see shpchp on your screenshot.

Sreenivas