Re: [Xen-users] dynamic memory extension not working on Debian Squeeze

[Peter Viskup <skupko.sk@xxxxxxxxx>]

On 11/14/2012 11:51 AM, Ian Campbell wrote:
> On Wed, 2012-11-14 at 10:46 +0000, Peter Viskup wrote:
> > On 11/14/2012 11:39 AM, Ian Campbell wrote:
> > > On Wed, 2012-11-14 at 10:35 +0000, Peter Viskup wrote:
> > > [...]
> > > > server1:~# xenstore-ls -fp | grep target
> > > > <this command is hanging>
> > > [...]
> > > > xenfs is not mounted on dom0 - could it be the reason of this issues?
> > > Could be, I'm surprised you were able to start a domain at all without
> > > it though.
> > >
> > > Also if xenstore is hanging then there is something else majorly wrong
> > > too. Probably best to remedy both of those first.
> > >
> > > Mounting xenfs might be enough to kick things back to life but otherwise
> > > you may need to reboot the host.
> > >
> > > Ian.
> > Sorry I was wrong - xenfs mounted on dom0 and also on domU.
> > Server rebooted last night (6-7 hours before) - no additional
> > installation tasks were performed.
> > These are xen-related packages installed:
> >
> > ii  xen-tools
> > 4.2-1                        Tools to manage Xen virtual servers
> > ii  xen-utils-4.0
> > 4.0.1-5.4                    XEN administrative tools
> > ii  xen-utils-common
> > 4.0.0-1                      XEN administrative tools - common files
> > ii  xen-hypervisor-4.0-amd64
> > 4.0.1-5.4                    The Xen Hypervisor on AMD64
> > ii  linux-image-2.6.26-2-xen-amd64
> > 2.6.26-27                    Linux 2.6.26 image on AMD64, oldstyle Xen
> > support
> > ii  linux-image-2.6.32-5-xen-amd64
> > 2.6.32-46                    Linux 2.6.32 for 64-bit PCs, Xen dom0 support
> What version of xenstore-utils do you have installed?
>
> > memory  = '256'
> > memmax  = '4092'
> [...]
>
> This is good, it *should* mean you can balloon up to 4G.
>
> > Command xenstore-ls still hanging.
> Are you running this in dom0 or domU? You should run it in dom0.
>
> If the xenstore tools don't work in dom0 then there is a pretty big
> problem. You could try strace'ing the client and/or daemon I suppose?
>
> One not uncommon problem with the C xenstored is a corrupted DB, so
> removing /var/run/xenstored/tdb and rebooting might help. In general
> removing this on boot (before starting the daemon) is a good idea, not
> sure if the Debian scripts do this for you.
>
> Ian.
I ran that xenstore command in dom0.
These are versions of xenstore packages:
ii  libxenstore3.0                                          
4.0.1-5.4                    Xenstore communications library for Xen
ii  xenstore-utils                                          
4.0.1-5.4                    Xenstore utilities for Xen
Strange is that xenstore tdb file is missing:

server1:~# ls -la /var/run/xenstored/
total 8
drwxr-xr-x  2 root root 4096 Nov 14 01:06 .
drwxr-xr-x 20 root root 4096 Nov 14 01:08 ..
srw-------  1 root root    0 Nov 14 01:06 socket
srw-rw----  1 root root    0 Nov 14 01:06 socket_ro

Debian is not removing that file during the shutdown (checked 
/etc/init.d/xend).
I also checked checksums of all files of all xen-related packages and 
all is OK.
As this is production box it's hard to strace it during the office hours.
Any way to get the xenstore tdb re-created without rebooting?

--
Peter

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