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Message-ID: <9738BCBE884FDB42801FAD8A7769C26501B2CAB8@NAMAIL1.ad.lsil.com>
Date:	Fri, 21 Sep 2007 17:05:51 -0600
From:	"Bagalkote, Sreenivas" <Sreenivas.Bagalkote@....com>
To:	"Chuck Ebbert" <cebbert@...hat.com>,
	"linux-scsi" <linux-scsi@...r.kernel.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"DL-MegaRAID Linux" <megaraidlinux@....com>,
	<djabbour@...ronis.com>
Subject: RE: Megaraid driver not detecting RAID volumes in kernel 2.6.22?

> 
> 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
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