Re: Virtual SCSI disks hangs on heavy IO

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On Mon, Mar 14, 2011 at 6:05 PM, Guido Winkelmann
<guido-kvml@xxxxxxxxxxxxxxxxx> wrote:
> Does anybody have an idea what might cause this or what might be done about it?

The lsi_scsi emulation code is incomplete.  It does not handle some
situations like the ORDERED commands or message 0x0c.

There is a patch to address the message 0xc issue, it has not been
applied to qemu.git or qemu-kvm.git yet:
http://patchwork.ozlabs.org/patch/63926/

Basically there is no one actively maintaining or reviewing patches
for the lsi53c895a SCSI controller.

virtio-blk works very will with Linux guests.  Is there a reason you
need to use SCSI emulation instead of virtio-blk?

Stefan
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