LVM snapshots have been around quite a while - but their copy-on-write (COW) implementation was flawed so that in case of multiple concurrently active snapshots perfomance degraded to non-acceptable levels. Until on one nice day it all got fixed in LVM2 2.02.90 release with LVM thin provisioning support.

Complete OpenNode OS Usage Guide is currently under active development - howto’s section and some usage examples below.

If in need to migrate OpenNode OS from single disk installation (no hardware raid) to linux software raid setup (RAID1) - please use this recipe. Conversion can be done online without much interrupting server operations besides a bit reduced disk IO.

OpenNode High Availability Cluster solutions are based on Red Hat Cluster Suite (RHCS) software. In this howto we describe one of the simplest ways to setup basic HA Cluster with shared block device (SAN or iSCSI) - resulting with simple 2-node active/passive failover setup which is ment to handle physical server failure.

• Download and burn OpenNode OS ISO installer image
• Boot server from OpenNode OS install CD
• Follow installer on-screen instructions
• Choose automatic partitioning (if server has hardware RAID or RAID is not needed). Automated partitioning creates all needed partitions and LVM volumes on servers first harddisk or RAID disk - if server has several harddisks or RAID disks and there is a need to spread initial partitions over these then manual partitioning is needed (or migrating LVM volumes later manually).
• Choose automatic partitioning with softraid setup (if server has no hardware raid and softraid setup is desired)
• Follow installer on-screen instructions to complete the installation and reboot