AIX 6.1 was released earlier this week. During the initial beta phase, they were considering calling it AIX 5.4. There was no AIX 5.4, nor was there a 6.0. They're debuting AIX 6 as version 6.1.
- Improved RBAC (Role Based Access Control) functionality
- Workload Partition (WPAR) virtualization - multiple virtual environments within one AIX instance, versus Logical Partition (LPAR) virtualization, which is multiple AIX instances on one system.
- Support for Encrypted Journaling file systems (JFS2/EFS)
- Trusted Computing Base - An optional secure-by-default installation
- AIX Security Expert - a template-based console for setting up security options
- Concurrent kernel updates - no reboot needed for certain types of kernel upgrades
- First-failure data capture functionality to aid in troubleshooting or reproducing obscure faults
- System routines that can gracefully recover from certain kernel crashes