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Bug#678236: linux-image-2.6.32-5-amd64: Disk IO error when running debian 6.0.x with buslogic virtual disk and 4G+ mem in a VMware VM



On Wed, 2012-06-20 at 19:17 -0700, Peter Cao wrote:
> Hi Ben,
> 
> The disk became read-only when the error happens so the log was not saved.
> But I have a screenshot for the error msg:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=debian-605-32bit-buslogic-6Gmem-IO_error.png;att=2;bug=678236
> 
> We have not see any error with PVSCSI adapter so far.
> And there is no error with debian 64bit release but only the 32bit release with large memory+buslogic.
[...]

So far as I can see, BusLogic has not been changed in any significant
way between Linux 2.6.32 and current mainline (3.5-rc3).  So unless you
know better, this problem also affects mainline Linux and should be
fixed there first.

But what is the point of using this driver at all under VMware, when we
could use vmw_pvscsi?  Do you make the same SCSI devices available to
the guest through both an emulated BusLogic adapter and paravirtual SCSI
adapter at the same time?

In that case, could the BusLogic driver detect that an adapter is
actually an emulation (based on PCI subsystem vendor ID?) and ignore it
because the vmw_pvscsi driver will work better?

If not, isn't it a bug in VMware that it enables the BusLogic device and
not the PV-SCSI device for Debian guests?

Ben.

-- 
Ben Hutchings
Every program is either trivial or else contains at least one bug

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