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

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.

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