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Re: [Qemu-discuss] qemu storage windows issue

From: Benoit
Subject: Re: [Qemu-discuss] qemu storage windows issue
Date: Wed, 24 Feb 2016 16:52:37 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.5.0

Thanks for the suggestion, I just finished a full test with iometer and 0 error detected
I am sending you the CSV report as I don't think the attached file is allowed on distribution list...

On 02/23/2016 09:13 AM, Fam Zheng wrote:
On Tue, 02/23 09:04, Benoit wrote:
You read in my head ;)
I thought about this yesterday and tested them and got the same
result !! It is like as soon as a disk is coming from virtualized
host I got the issue...
I also had the idea to create a partition instead of a raw image and
got the same issue
This indeed makes the application suspicious.  Do you see any other errors
beside that application in question?

(A way to valiate the virtual disk is using a storage tester such as HDTune or


On 02/23/2016 02:28 AM, Fam Zheng wrote:
On Mon, 02/22 16:36, Benoit wrote:
Thanks Fam
No error on my guest / host
Disk usage in Explorer is exactly what it supposed to be this is
where it is strange...
Does your application work well on other storage types, like virtio-scsi or


On 02/17/2016 02:14 AM, Fam Zheng wrote:
On Tue, 02/16 20:41, Benoit wrote:

-host archlinux / qemu 2.4.1 / kvm
-guest windows 7 pro x64
-qemu-img create -f raw en_x64_windows_7_ipc2_storage_75 75G

-drive file=/srv/qemu/vm/en_x64_windows_7_ipc2_storage_75,if=virtio,cache=none,format=raw,discard=unmap

My D: drive (74GB) has 2x 32GB files used for a program to store data.

I realized that my product starts doing FIFO (erasing old data to be
able to write fresh data) as soon as the space used is more than
4GB. It is like I got the same limitation than a FAT drive, my
product detects that the disk is full as soon as more than 4GB are
used on the disk.
Any error message in guest/host?  What does Windows Expolorer say about the
disk usage?



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