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

[Peter Viskup <skupko.sk@xxxxxxxxx>]

On 11/14/2012 12:13 PM, Peter Viskup wrote:
> 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
Just for reference - I opened bugreport at Debian [1], and I have been 
told it is already implemented in xen-utils-common/4.1.0~rc6-1 (means 
it's not in current stable branch).
Will try to remove this tdb file and inform you if it helped me.

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=693217

--
Peter

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