Re: [Qemu-devel] [PATCH v3 0/6]: block: Add I/O status support

[Mark Wu <wudxw@vnet.linux.ibm.com>]

On 09/27/2011 04:43 AM, Luiz Capitulino wrote:
> This series adds support to the block layer to keep track of devices'
> I/O status. That information is also made available in QMP and HMP.
>
> The goal here is to allow management applications that miss the
> BLOCK_IO_ERROR event to able to query the VM to determine if any device has
> caused the VM to stop and which device caused it.
>
> Here's an HMP example:
>
>    (qemu) info status
>    VM status: paused (io-error)
>    (qemu) info block
>    ide0-hd0: removable=0 io-status=ok file=disks/test2.img ro=0 drv=qcow2 encrypted=0
>    ide0-hd1: removable=0 io-status=nospace file=/dev/vg_doriath/kvmtest ro=0 drv=qcow2 encrypted=0
>    ide1-cd0: removable=1 locked=0 io-status=ok [not inserted]
>    floppy0: removable=1 locked=0 [not inserted]
>    sd0: removable=1 locked=0 [not inserted]
>
> The session above shows that the VM is stopped due to an I/O error. By using
> the info block command it's possible to determine that the 'ide0-hd1' device
> caused the error, which turns out to be due to no space.
>
>
I test it with the options enospc and stop on virtio and scsi models. It 
works fine.
Tested-by: Mark Wu <wudxw@vnet.linux.ibm.com>