[Xen-users] Xen with HA

[Marco Sinhoreli <marco@xxxxxxxxxxxxxx>]

Hello everybody,

We are thinking about using virtual machines for a scene of high 
availability where is contemplated the division of the VMs in two hosts. 
Considering that both hosts will have 6 VMs and in the host A will be 
active the  VMs vm1, vm3 and vm5 , while in the host B will be active 
the VMs vm2, vm4 and vm6. For each VBD allocated in one LV (Logical 
volume of the LVM) we pretend to implement the following architecture.
   P = primary | S = Secondary
------------------------------------
             Host A
------------------------------------
vm1   vm2   vm3   vm4   vm5   vm6
 |     |     |     |     |     |
drbd1 drbd2 drbd3 drbd4 drbd5 drbd6
 P     S     P     S     P     S
------------------------------------
 |     |     |     |     |     |
 |     |     NETWORK     |     |
 |     |     |     |     |     |
------------------------------------
 S     P     S     P     S     P
drbd1 drbd2 drbd3 drbd4 drbd5 drbd6
 |     |     |     |     |     |
vm1   vm2   vm3   vm4   vm5   vm6
------------------------------------
             Host B
------------------------------------

Consider that, where the block device is primary, the VM is active on 
the host, and where the device blocks  is secondary, the VM is inactive 
on this host.
The heartbeat will have one responsible script for the VMs allocation in 
case of hardware failure from one of the hosts for your even. In case of 
programmed stop, the host from the  VMs will do the migration for it's
even without the stop of the services that are been executed. Will occur 
a prolongated downtime and full lost of the VMs activities only in case 
of a abrupt stop of the servers hardware.
We wish information from the list if this solution have been done by 
someone,in positive case, if there is some documentation that 
contemplate this implementation ,and in negative case, how to do an 
implementation of a HA integrated with Xen.
Best regards


Marco Sinhoreli
Linux expecialist
Samurai Projetos Especiais
São Paulo - Brazil


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