Backup Pooled Installations; Restore The Backup On A New Set Of Hosts - Intel S3420GP Installation Manual

To reset these VMs back to the halted state so they can be started again, use the
xe vmshutdown vm=vm_name -force
command or use the
xe vm-reset-powerstate vm=vm_name -force
command.
Note: XenServer* hosts restored using this method will have their UUIDs preserved. If a different
physical machine is restored while the original XenServer host is still running, there will be a UUID
clash. The main observable effect of this clash is that XenCenter* will not to connect to the
second XenServer host. Pool database backup is not the recommended mechanism for cloning
physical hosts. Instead, use the automated installation support. See
Procedures on page 30.

Backup Pooled Installations

In a pool scenario, the master host provides an authoritative database synchronously mirrored by the
member hosts in the pool. This provides a degree of built-in redundancy to a pool; the master can be
replaced by any member, because each of them has an accurate version of the pool database. Refer to
the XenServer Administrator's Guide for more information on how to transition a member to become a
master host. This level of protection may not be sufficient, for example, if the shared storage
containing the VM data is backed-up in multiple sites, but the local server storage (containing the pool
metadata) is not. To fully recreate a pool given only a set of shared storage, first backup the "xe pool-
dump-database" against the master host, and archive the file.

Restore the Backup on a New Set of Hosts

To restore a backup on a new set of hosts, follow these steps:
1) Install a new set of XenServer* hosts from the installation media or via PXE.
2) Use the "xe pool-restore-database" on the host designated to be the new master.
3) Run the "xe host-forget "command on the new master to remove the old member machines.
4) Use the "xe pool-join" command on the member hosts to connect them to the new cluster.
Refer to the Coping with Machine Failures section of the XenServer Administrator's Guide for specific
restoration scenarios.
Citrix* XenServer* 5.5.0 Installation Guide -
Intel® Server Board S3420GP
Appendix B: Maintenance
27