EVMS & HA

[Marc Schmitt]

Hi Lars,

Lars Marowsky-Bree wrote:
> On 2003-02-04T14:13:54,
>    Marc Schmitt <schmitt@inf.ethz.ch> said:
> 
> 
>>I was wondering if anyone has volume management (i.e. EVMS) in 
>>production combined with heartbeat?
>>
>>EVMS and LVM are not cluster aware (yet, afaik). It's no problem to 
>>manipulate the volumes on the active node, but how do you syncronize the 
>>failover node in an intelligent way?
> 
> 
> You do not ;-) You deactivate the volume group on the passive node(s), make
> the changes on the active one, rescan on the passive one(s) and reactivate.
> That's not intelligent, but the only way right now.

That's what I thought. I was not sure however if deactivating the volume 
group on the failover node would have an influence on the state of the 
volume group on the active node. Thanks for clarifying.

> 
> In fact, EVMS is working on integrating with heartbeat's cluster messaging
> API. The CCM code in heartbeat was contributed for this by Ram Pai of the EVMS
> project; EVMS will hopefully be able to make metadata changes without the
> above hack before 2003 is up.

That's great, thanks for the info. :)

Regards,
	Marc