Xen gets transparent high availability

I could see the uses for this. However, this will only protect against Host problems. If you have problems on the guest, you'll have them on the other node, too. But, I guess for things like IRC servers, you have no choice if you want HA.

Obviously it wouldn't be cost-feasible for Linode to have a hot spare for every server, but this would be great if it can be set up on-demand, e.g. for when they need to migrate people off of a dying server.

@mnordhoff:

Obviously it wouldn't be cost-feasible for Linode to have a hot spare for every server, but this would be great if it can be set up on-demand, e.g. for when they need to migrate people off of a dying server.

Or pay extra for the HA option :)