[Linux-cluster] linux cluster and virtualization - sharedxend-config.sxp

[Peter Tiggerdine]

Aaron,

 

I think they meant the config file for the VM not the global config for
xen.

 

Regards,

 

Peter Tiggerdine

HPC - UQ

 

________________________________

From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Aaron Benner
Sent: Saturday, 11 July 2009 6:57 AM
To: linux-cluster at redhat.com
Subject: [Linux-cluster] linux cluster and virtualization -
sharedxend-config.sxp

 

All,

 

The documentation provided via the conga cluster recipe (Add a virtual
machine as a clustered service
<http://sourceware.org/cluster/conga/cookbook/VMs_as_services> ) states
that:

 

1) "Both xen config files [e.g. xend-config-sxp] and VM disk images must
be located on shared storage, with identical mount paths for each node"

 

and then on the next slide states:

 

2) "Xend must be running on each node, and MUST BE STARTED BEFORE THE
CMAN CLUSTER DAEMON"

 

However, it seems to me that this creates a chicken and egg problem.  In
particular if my xend-config.sxp is on a shared storage device (In my
case a gfs2 formatted iSCSI disk) then doesn't that imply that I must
have cluster services running to mount/access the filesystem.  If that
is the case then it is impossible for me to start xend before cman as my
xend-config.sxp will not exist until cman starts and I mount my gfs2
partition.

 

The only other documentation I found for this setup:
http://magazine.redhat.com/2007/08/23/automated-failover-and-recovery-of
-virtualized-guests-in-advanced-platform/ says absolutely nothing about
system service startup order and includes an example of a cluster node
reboot.

 

So, my question is this; is the default ordering of system service
startup (cman < xend) workable with virtual machines defined as cluster
services?

 

Thanks -- Aaron

 

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