RE: [Xen-users] xen save error

["Cole, Ray" <Ray_Cole@xxxxxxx>]

If there is any additional probing around you want me to do let me know.  I'm 
willing to help get more information.

-- Ray

-----Original Message-----
From: Steven Hand [mailto:Steven.Hand@xxxxxxxxxxxx]
Sent: Thursday, September 15, 2005 2:09 PM
To: Cole, Ray
Cc: Ian Pratt; bryant.johan@xxxxxxxxx; ian.pratt@xxxxxxxxxxxx;
xen-users@xxxxxxxxxxxxxxxxxxx; Steven.Hand@xxxxxxxxxxxx
Subject: Re: [Xen-users] xen save error



>I've got 2 machines where I've installed 2.0-testing from
>xen-2.0-testing-install.tar.gz.  I downloaded it this morning to make
>sure I had the latest.  Ran install.sh.
>
>I made sure grub is pointing to xen-2.0.gz, which is in turn a symbolic
>link to xen-2.0-testing.gz.  I did a depmod for 2.6.12-xen0 and xenU and
>created initrd's for both.  Also modified grub to use the 2.6.12-xen0
>kernel with it and rebooted.  uname -a confirmed I'm using 2.6.12-xen0. 
>Domain 0 was orignally a RedHat AS 4.0 installation ('minimal =
>installation' selected).
>
>I then copied a Fedora Core 4 installation image to an NFS mount
>location.  Also created a swap file (have tried with and without) on the
>NFS link. I created the .cfg file for the domain - nothing special about
>it.  /Domains/t is where the NFS mount is made.  The .cfg is later in
>this email.
>
>The FC4 image has had /lib/tls renamed to tls.disabled, although I still =
>get a warning when booting the user domain that I've got /lib/tls.  I =
>don't know, maybe the initrd has it.
>
>Anyway...from I started xend/xfrd.  I start up the FC4 domain using =
>2.6.12-xenU.  This domain uses autofs extensively (all /home entries are =
>automounted) and NIS.  I log in to the user domain using a remote xterm =
>(ssh into the domain, start xterm).  I then start 'top' so I can see =
>that the domain is still alive.
>
>I then do:
>
>  xm migrate --live rayfed4 {new_machine}
>
>back and forth between the two machines that have identical Xen 2.0
>Testing installations.  I can generally go back and forth about 4 or 5
>times before one of the migrate commands tells me it had an error (can't
>suspend).  I had at one time put printk's into the user kernel (after
>downloading the 2.0 testing source, of course..) and confirmed that the
>kernel receives the message to suspend, but the suspend work the kernel
>schedules never gets executed.  I wait about 10 seconds between
>migration attempts.

Ok - thanks for the info. 

I've just installed a fresh 2.0-testing (built from source) on a test
box and run about 35 (and counting) live migrations to localhost with
no observed errors (I am also ssh'd into the guest and running top). 
My root fs is centos 4.1 for both dom0 and the guest, although I'm 
using a local lvm volume for the guest rather than a loopback file 
over NFS... hmm... 

I'll try to get another machine grooved so can test it across the
network....

cheers,

S.


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