Re: [Qemu-devel] The image size of instance VM keeps growing

[Charles . Tsai-蔡清海-研究發展部]

Stefan,

We can run a tool to see if there is any active I/O or not. Does the image size 
shrink back if an I/O activity stops?
What we found here is that the image size kept growing. If this problem 
persists, it could eat up the entire disk space.


-----Original Message-----
From: Stefan Hajnoczi [mailto:address@hidden 
Sent: Monday, May 21, 2012 4:44 PM
To: Charles.Tsai-蔡清海-研究發展部
Cc: address@hidden; Jonah.Wu-吳君勉-研究發展部
Subject: Re: [Qemu-devel] The image size of instance VM keeps growing

On Mon, May 21, 2012 at 8:47 AM, Charles.Tsai-蔡清海-研究發展部
<address@hidden> wrote:
> Ideally, the image size of instance VM is supposed to remain in a 
> smaller size than the based-image. Why does it keep growing in size 
> which is even bigger than that of based-image? Our VM, in fact, did 
> nothing during the idle state.

The guest is probably issuing I/O.  Are there Windows tools you can use to see 
which process or kernel component is issuing I/O?

You can try running qemu-img check <image-file> to ensure that the
qcow2 file is consistent.  Error messages will be printed if there are leaks or 
corruptions in the qcow2 file.

Stefan