[nSLUG] XEN & Heartbeat

Ian Campbell ian at slu.ms
Wed Jun 3 15:10:35 ADT 2009


On Wed, Jun 03, 2009 at 09:17:44AM -0400, Stephen Gregory wrote:
> On Wed, Jun 03, 2009 at 02:13:46AM +0000, Ian Campbell wrote:
> 
> > it's unplanned downtime I don't think hot-hot HA would save you
> > either... since you'd have unfinished transactions (disk, network, or
> > something higher level like a DB request) ... if I'm wrong on that,
> > please let me know, it would be neat to see how they did it.
> 
> The lastest version of VMware ESX (v4, aka vSphere) has a Fault Torerent
> mode that supports hardware failure. Two identical virtual machine run on two
> physical machines and are kept in sync. No idea how they do it.
> 
> You can achieve the same goal using the Linux Virtual Server (LVS)
> tools running in the virtual machines. You may need to add Linux HA as
> well. I haven't used LVS and only dabbled with HA briefly.

Yeah, but those aren't "fault tolerant" to the point where if you're
writing to disk on one machine which crashes halfway through it
continues seamlessly on the other, are they?



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