[Xen-ia64-devel] Re: [PATCH][TAKE3] add support for hvm live migration

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

Hi Alex,

I succeeded in VM pingpong between different machines several times.
I've never met "xc_save: timed out". 

My testing config is like as follows:
==================================================
builder='hvm'
kernel = "/usr/lib/xen/boot/hvmloader"
device_model = '/usr/lib/xen/bin/qemu-dm'
name = "Windows"
memory = 512
# guest image disk is on NFS
disk = [ 'file:/nfs/images/win.img,ioemu:hda,w']
# network is disabled
#vif = [ 'bridge=xenbr0' ]
localtime=1
acpi=1
usb=1
usbdevice='tablet'
vcpus=1
==================================================
Is the network interface a problem, by any chance?

FYI, occasionally a windows hangs up after live migration. 
It's unstable yet.

Thanks,
Kouya

Alex Williamson writes:
> 
> On Thu, 2008-02-14 at 13:18 +0900, Kouya Shimura wrote:
> > Sorry again.
> > I succeeded in windows server 2003 live migration with an attached patch.
> 
> Hi Kouya,
> 
>    I'm curious, what did you use for the filesystem to do a windows live
> migration?  Or maybe you did a localhost migration?  I applied this, but
> I seem to only be able to migrate an HVM domain once.  I started it on
> server A, did a successful live migration to server B, then tried to do
> another live migration back to server A, and got this:
> 
> [2008-02-14 14:26:37 7311] DEBUG (__init__:1072) [xc_save]: 
> /usr/lib/xen/bin/xc_save 22 4 0 0 5
> [2008-02-14 14:26:42 7311] INFO (__init__:1072) xc_save: timed out waiting 
> for qemu to switch buffers
> [2008-02-14 14:26:42 7311] INFO (__init__:1072) 
> [2008-02-14 14:26:42 7311] ERROR (__init__:1072) Save failed on domain 
> debianVT (4).
> Traceback (most recent call last):
>   File "//usr/lib/python/xen/xend/XendCheckpoint.py", line 112, in save
>     forkHelper(cmd, fd, saveInputHandler, False)
>   File "//usr/lib/python/xen/xend/XendCheckpoint.py", line 369, in forkHelper
>     raise XendError("%s failed" % string.join(cmd))
> XendError: /usr/lib/xen/bin/xc_save 22 4 0 0 5 failed
> 
> Are you able to migrate more than once?  Thanks,
> 
>       Alex
> -- 
> Alex Williamson                             HP Open Source & Linux Org.

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