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From: | Guannan Ren |
Subject: | Re: [Qemu-devel] [libvirt] [PATCH 3/5] qemu: add usb-bot support from disks points of view |
Date: | Tue, 03 Sep 2013 11:26:32 +0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 |
On 09/02/2013 08:57 PM, Daniel P. Berrange wrote:
On Mon, Sep 02, 2013 at 05:38:42PM +0800, Guannan Ren wrote:usb-bot only supports 16 luns(0~15) and they must be contiguous, (using lun 0 and 2 without 1 doesn't work). In this case qemu doesn't throw an error, we can not find the lun 2 in guests. So Adding a checking function in libvirt to prevent from this case.Hmm, this seems like a problematic restriction. How does this work if we start off a guest with 3 disks attached to the usb-bot SCSI controller. Then hot-unplug the 2nd disk.
Currently, the qemu will throw out an error when I hot-unplug any of disks attached to usb-bot controller.
{ "execute": "device_del", "arguments": { "id": "scsi1-0-0-1"}}{"error": {"class": "GenericError", "desc": "Bus 'scsi1.0' does not support hotplugging"}}
Libvirt will report an error: # virsh detach-disk rhel64qcow2 sdd --current error: Failed to detach diskerror: internal error: unable to execute QEMU command 'device_del': Bus 'scsi1.0' does not support hotplugging
Next time we need will need to start with with LUNs 0 and 2 populated only, otherwise we have ABI change upon migrate or save/restore. I think this restriction about contiguous luns must be removed if this device is to be usable with multiple luns. Daniel
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