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Subject: RE: Megaraid driver not detecting RAID volumes in kernel 2.6.22?
Date: Fri, 21 Sep 2007 17:05:51 -0600
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Thread-Topic: Megaraid driver not detecting RAID volumes in kernel 2.6.22?
Thread-Index: Acf8mINPNF6sJfsiTEKhPerw6irwCwACr0AA
From: "Bagalkote, Sreenivas" <Sreenivas.Bagalkote@lsi.com>
To: "Chuck Ebbert" <cebbert@redhat.com>,
       "linux-scsi" <linux-scsi@vger.kernel.org>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>,
       "DL-MegaRAID Linux" <megaraidlinux@lsi.com>, <djabbour@intronis.com>
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> 
> 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