TrueCL

TrueCL is the successor to linuxha.net and it has been designed to support clusters of many nodes currently only test to 8, across different UNIX variants. At present the software is in use on the following platforms:

 * Linux
 * Solaris
 * HP-UX

It has been designed to allow easy migration to other OS variants too. Some of the features offered by TrueCL include:

 * Storage types - Linuxha.net was limited to making use of replicated storage. TrueCL continues to support replicated storage, but can also use 'shared storage' - where the same storage is visible to multiple nodes, or 'nfs' - using a remote NFS storage device to provide application storage.
 * Dynamic Architecture - all functionality has been designed to work without requiring to take the applications being clustered, or the cluster itself, down. This indicates changes to the cluster configuration, application configuration or even the TrueCL software.
 * Volume Manager Neutral - TrueCL requires the use of a volume manager for managing storage, but supports LVM (Linux, HP-UX), Solstice (Solaris), VxVM (Linux, Solaris, HP-UX) and ZFS (Solaris).
 * File System Neutral - TrueCL tries support all common, stable journaled file systems. This list covers ext3, reiserfs, xfs and jfs (for Linux), ufs and zfs for Solaris and VxFS for Linux, Solaris and HP-UX.
 * Heterogeneous Cluster Support - a cluster can contain nodes running any of the supported operating systems. If the volume manager and file system support it should be possible to fail over an application from one operating system to another.
 * No hard limits - there are no limits on the number of applications, the amount of storage, the number of IP addresses or application monitoring that can be configured.
 * Secure - all communication between all nodes in the cluster is encrypted. A cluster can use a high performance custom security protocol, or the slower, but a more secure RSA-based protocol.

TrueCL is still in active development, but people are encouraged to view the documentation and look at test deployments. The software is stable but would benefit from more usage cases.

What is new in this release:

• A significant update compared to the previous release, this one includes over 100 fixes and enhancements.
• It offers greater functionality, improved stability, ease of use, and many additional manual pages and improved documentation.