Re: [Xen-users] 2 Servers: Exact Copy

[Jeff Williams <jeffw@xxxxxxxxxxxxxxxxxxxx>]

On 03/09/2010, at 5:23 PM, Jangita wrote:

> On 02/09/2010 6:29 p, Greg Woods wrote:
> 
>> 
>>> What you are
>>> talking about is a HA (High Availability) setup
>> 
>> If what you want is really just one server backed by a hot spare, then
>> you don't need Xen at all. The easiest way to do this is using heartbeat
>> for high availability and DRBD to replicate the data. Heartbeat v1 does
>> this very well and is fairly easy to understand. Unfortunately, all the
>> HA developers want everyone to run the latest version of heartbeat (v2
>> or v3) or corosync, with pacemaker and despite what they sometimes say,
>> this is a very large basketball to swallow. It is massive overkill just
>> for a pair of hot spare servers with a shared IP address. But it is
>> difficult to find anyone who will help you with heartbeat v1 since it is
>> "obsolete", but you may be able to figure it out yourself.
>> 
>> The official documentation for HA on Linux is at
>> http://www.linux-ha.org/ and http://www.drbd.org/
>> 
>> --Greg
> Thanks I heard of remus http://wiki.xensource.com/xenwiki/Remus that could do 
> something similar. Let me look at your suggestions. Many thanks to the list.
> 

If you want the fail over to be transparent to the end users then Remus is what 
you're looking for and (I think) is included in Xen 4.0.1. Kemari is a similar 
project. These provide the same sort of redundancy as vmware fault tolerance.

Heartbeat and DRBD will provide a failover server which can start automatically 
if the active server fails, but it will look like a server restart to end 
users. This is more akin to vmware high availability, but doesn't sound like 
what you were after.

Jeff
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