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

[Peter Viskup <skupko.sk@xxxxxxxxx>]

On 11/14/2012 12:08 PM, Peter Viskup wrote:
> 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
I found the tdb file - in Debian it is in /var/lib/xenstored:

server1:~# ls -la /var/lib/xenstored/tdb
-rw-r----- 1 root root 1368064 Nov 14 11:27 /var/lib/xenstored/tdb

I will try to remove it and reboot this server at night. Is there any 
way to check the xenstore tdb file consistency?
--
Peter

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