Stability & Bugs

Hi,

it seems to me that the stability of XEN (full
virtualization) with the
latest changeset is much better than with the original
packages of
SLES10, but not as good as I thought.

I've this enviroment:
HP DL380G5
1 Dual Core CPU model name      : Intel(R) Xeon(R) CPU      
     5120 

1.86GHz
3 GB RAM
SAS Disks

I've some Debian guests, one Windows 2003 Server and one
SLES 10 guest.
All are full virtualized.

When I do some heavy memory tests (let's call the malloc),
where just
the memory is allocated every two seconds (2 processes with
64 MB) and
freed again, the XEN host server dies unexpected. It just
stops working,
I can try to enter "root" at the console and then
it just stops.
Rebooting does work.
(If anyone is interested in my malloc script I will provide
this.)

Or an another example: I do restart the SLES10 instance via
"ctrl-alt-del" with "F8" in the
VNCviewer window. The restart does work
fine until the system does reach the udev. Then it does slow
down heavy
and the CPU usage in "xm top" does go up to nearly
100%. Services such
network do not work when this does happen.
A system halt of the guest does resolve this problem.
(I can attach a screenshot, but this will exceed my mailsize
limit in this list...)

Also starting a second instance of an already running
instance is
possible. Earlier versions of "xm create" did
prevent that, the current
changeset does not.

Any ideas about this?

Jan

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Jan Albrecht wrote:
> Also starting a second instance of an already running
instance is
> possible. Earlier versions of "xm create" did
prevent that, the current
> changeset does not.
>   
This seems to be a real big problem.
"xm create" does not check if the instance is
already running. Im my
case is tries to startup the instance. In best case it
succeeds and the
server is running twice, in worst case the host system
dies.

Anyone had the same experience?

Jan

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>>> On Wed, Feb 21, 2007 at  6:07 AM, in message
<45DC4418.2070709gmail.com>, Jan
Albrecht <jan.albrechtgmail.com> wrote: 
> Jan Albrecht wrote:
>> Also starting a second instance of an already
running instance is
>> possible. Earlier versions of "xm create"
did prevent that, the current
>> changeset does not.
>>   
> This seems to be a real big problem.
> "xm create" does not check if the instance is
already running. Im my
> case is tries to startup the instance. In best case it
succeeds and the
> server is running twice, in worst case the host system
dies.
> 
> Anyone had the same experience?

Yes, there is a bug filed regarding this, so I hope to get
it fixed soon.

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