[Linux-HA] XEN domU HA

[Jan Kalcic]

Hi All,

I'm new in this lists and in the linux-ha in general so I hope you guys can give me a warm welcome. :)

I'm designing a scenario where I have two physical machine both running
XEN. Each machine has two virtual machine running different services
(let's suppose apache and FTP) and they are in a HA cluster connected to
a shared disk or better to a SAN. The design would be like the following:

VM1 (apache) -------- Heartbeat ----------  VM1 (apache)
VM2 (FTP)   --------- Heartbeat ----------  VM2 (FTP)
    |                                          |
    |                                          |
Physical                                    Physical
Machine                                     Machine
    |                                          |
    |                                          |
    |___________________ SAN___________________|



Now, all I have to be worried about is the split brain. I shouldn't use
STONITH to switch the power supply off otherwise I would switch off all
the virtual machines running on it. (This scenario is just an example,
actually there would be 4 VMs on each physical machine). So, how should
I consider split brain? Do you guys see a better design for this
scenario? Has anyone experienced this and can give me some feedback?

TIA,
Jan