Re: [Qemu-devel] Strange problems with lseek in qemu-img map

2015-06-03 Thread Wen Congyang
Cc: ext4 maillist On 06/03/2015 10:06 PM, Stefan Hajnoczi wrote: > On Tue, Jun 02, 2015 at 02:54:17PM +0200, David Weber wrote: >> Testcase: >> # qemu-img create test 500G >> # time qemu-img map test >> >> Systems: >> O3-3: Kubuntu 15.04 Workstation with stock-kernel 3.19.0-18-generic and >> stoc

Re: [Qemu-devel] Strange problems with lseek in qemu-img map

2015-06-03 Thread Wen Congyang
On 06/02/2015 08:54 PM, David Weber wrote: > Hello, > > I'm currently evaluating to switch our virtualization servers to a newer OS. > This includes a switch from qemu 1.7 to 2.2 or 2.3. > Our system heavily relies on big sparse images and drive_mirror. While > testing, I experienced some probl

Re: [Qemu-devel] Strange problems with lseek in qemu-img map

2015-06-03 Thread Stefan Hajnoczi
On Tue, Jun 02, 2015 at 02:54:17PM +0200, David Weber wrote: > Testcase: > # qemu-img create test 500G > # time qemu-img map test > > Systems: > O3-3: Kubuntu 15.04 Workstation with stock-kernel 3.19.0-18-generic and stock > qemu 2.2.0 > Dinah: Ubuntu Server 15.04 with stock-kernel 3.19.0-18-gene

[Qemu-devel] Strange problems with lseek in qemu-img map

2015-06-02 Thread David Weber
Hello, I'm currently evaluating to switch our virtualization servers to a newer OS. This includes a switch from qemu 1.7 to 2.2 or 2.3. Our system heavily relies on big sparse images and drive_mirror. While testing, I experienced some problems with that combination. The strange thing is, that e