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Re: [Qemu-block] qemu exit with pending I/O
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-block] qemu exit with pending I/O |
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Date: |
Mon, 27 Apr 2015 14:11:05 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 27/04/2015 13:51, Peter Lieven wrote:
>> The reason to do this, is that while I/O is pending you do not know if
>> the I/O has been completed or not.
>
> But if I consider a raw image, quitting without a clean shutdown can
> also leave an inconsistent state?
But you know that all I/O submitted to disk has been handled.
The bdrv_drain_all() avoids that some leftover I/O mysteriously pops up
while another VM, or another instance of this VM, is using the image.
That's much worse.
Paolo