RE: [Xen-users] Distributed xen or cluster?

["Joseph L. Casale" <JCasale@xxxxxxxxxxxxxxxxx>]

>> I think you misunderstood. Live migration of a domU with 1G memory
>> might take a minute or two, but the actual downtime is about a SECOND
>> or two :D
>
>I'll have to play with this. The problem is that on a failure, you never know 
>when the server is going to go down. Makes me wonder if I could have a simple 
>script going which constantly sends the >updates to a shared drive and some 
>heartbeat mechanism on standby machine/s so that if main server goes down, 
>another quickly takes over.
>
>Wonder if that's the idea behind the link that Rob sent me. No need to 
>re-invent the horse, looks like there are in fact lots of ideas out there.

You are expecting to make "an instance of a vm" fault tolerant. I haven't seen
that, but I have seen storage fault tolerant as people have stated. So you still
are concerned with the xen server tanking (which makes redundant storage 
useless)
you need to handle this at the application level. Such as fault tolerant 
service's
running on two xen servers with their each own vm.

VirtualServerA on XenServer1 running some cluster aware application that *you* 
need
redundant with VirtualServerB on XenServer2.

Many applications and OS's have this feature, Windows Clusters etc. You could 
cluster
a file server this way so the backend is redundant and the file serving 
application is
redundant. Clients then access a virtual host that is created by the cluster 
software
running on the two vm's...

jlc

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