illumos Review

Illumos is completely free and open source.

illumos uses ZFS as its file system. ZFS is also a logical volume manager besides being a combines file system.

The main features of ZFS include: protection against data corruption, data compression, checking continuous integrity, high storage capacities support etc...

Zones provide an isolated environment to run applications in. Processes that run in zones are prohibited to interfere or monitor any other activity in the system.

illumos uses DTrace for performance analysis and troubleshooting.