On August 15, 2011, Joyent announced that it was releasing SmartOS as open-source software. The operating system behind Joyent’s cloud offerings combined Solaris/illumos technologies with two forms of virtualization: OS-level isolation through Zones and hardware virtualization through KVM. Joyent presented that combination as a foundation for multi-tenant hosting and software for cloud operators.
What SmartOS was—and why Joyent released it
In its August 15, 2011 report, Data Center Knowledge described SmartOS as the operating system behind Joyent’s cloud computing offerings and as a multi-tenant application-hosting platform. The report said Joyent made the source available for download and was starting a project community.
The release also reflected a shift in Joyent’s role. In a September 2011 account, Joyent engineer Brendan Gregg described the company as moving from operating a public cloud toward also producing software for cloud operators. In that historical stack, SmartOS supplied the operating system and virtualization capabilities; SmartDataCenter managed the cloud infrastructure. Gregg said Joyent deployed SmartDataCenter in its own public cloud, a period-specific account rather than evidence about current service availability. Gregg’s account provides that company context.
What was different about SmartOS?
Its distinguishing architectural idea was to put OS-level virtualization and full hardware virtualization on the same operating system, alongside storage and observability tools inherited from the Solaris/illumos family. The announcement’s strongest comparative language came from Joyent, not an independent platform comparison: chief scientist and co-founder Jason Hoffman said in the 2011 report, “Joyent SmartOS is the first hypervisor platform to emerge in five years, and it’s the only cloud server solution that can manage both KVM hardware virtualization and operating system-level virtualization on a single OS.” Those “first” and “only” claims are Hoffman’s characterization at the time, not independently established rankings.
#1 Best Overall
- Intel Dual CPU Sockets: This C612 chipset server motherboard is designed with dual CPU sockets, which can support Xeon E5 V3/V4 series processors. (Note: Core i7 not support Dual-CPU mode, if only one CPU is installed, please install it in the left slot)
- DDR4 Memory Slots: The memory slots of the LGA 2011-v3 motherboard is designed with 8-channel, which can support DDR4, DDR4 ECC, DDR4 RECC RAM. It supports effective frequencies is 2133/2400MHz, and the maximum capacity is 256GB. (Note: When use E5 v4 CPU, can not support Desktop DDR4 RAM)
- PCIe 3.0 Protocol: Equipped with 2 PCIe 3.0 X16 graphics card slots (with steel case), and 1 PCIe 3.0 X8, 2 PCIe 2.0 X1. The transfer rate can reach 15.754 GB/s. Equipped with 2 M.2 hard disk slots, which can achieve fast reading even if multiple programs are running
- Stable Power Supply: The X99 Dual CPU motherboard use 24+8+8pin standard power supply interface, 8-phase power supply. Precise modularization provides good heat dissipation and makes the program run more stably
- Strong Expandability: The X99 gaming motherboard is equipped with multiple expansion interfaces to ensure that the motherboard has more room for improvement, include 4*USB 3.0 ports, 2*USB 2.0 ports, 8*SATA 3.0 ports, 2*network ports
Zones: OS-level virtualization
SmartOS Zones isolate applications or workloads while sharing the host operating-system kernel. This is OS-level virtualization: it can support dense, separate environments without requiring each one to run its own kernel. SmartOS documentation describes Zones as its OS-level virtualization mechanism. SmartOS documentation
KVM: full guest operating systems
Joyent ported KVM to SmartOS. KVM provides hardware-assisted virtualization for full guest operating systems, including Linux or Windows, rather than only environments sharing the host kernel. This made the platform’s design useful where operators needed both lightweight Zones and conventional virtual machines. The two mechanisms address different workload requirements; the announcement did not establish a performance or security ranking against other hypervisors.
Rank #2
- Ready for Advanced AI PC: Designed for the future of AI computing, with the power and connectivity needed for demanding AI applications
- Intel? LGA 4710-2 socket: Ready for Intel Xeon 600 Processors for Workstation
- CPU and memory overclocking: The performance of ECC R-DIMM DDR5 memory (2DPC) is further enhanced by the exclusive NitroPath DRAM technology
- Ultrafast connectivity: 7 PCIe 5.0 x16 slots, Realtek 10Gb LAN and Intel? 2.5Gb LAN, 4 M.2, 2 SlimSAS, and USB4? and USB 20Gbps Type-C
- Server-grade IPMI remote management: Hardware and software-level with ASUS IPMI expansion card support, plus a real-time monitoring and management software – ASUS Control Center Express
ZFS and DTrace: storage and observability
SmartOS also drew on ZFS for storage capabilities and DTrace for system-wide tracing and troubleshooting. Together with Zones and KVM, these technologies gave cloud operators tools for isolating workloads, running different operating systems, managing storage, and investigating system behavior. SmartOS materials describe these as part of the platform’s Solaris/illumos heritage.
How SmartOS fit with SmartDataCenter
SmartOS and SmartDataCenter had related but distinct jobs. SmartOS was the host operating system and virtualization layer; SmartDataCenter was Joyent’s infrastructure-management product. That distinction matters: the open-source announcement concerned SmartOS, while Gregg’s account describes SmartDataCenter as the management system used to operate cloud infrastructure.
Rank #3
- AMD socket sTR5 supports up to 96-core CPUs: Ready for AMD Ryzen Threadripper PRO 7000 WX-Series Processors.
- Ultrafast connectivity:Seven PCIe 5.0 x16 slots, dual 10 Gb LAN ports, four M.2 slots, two rear USB4 40Gbps Type-C and SlimSAS NVMe support.
- CPU and memory overclocking: Support for up to 2TB ECC R-DIMM DDR5 memory modules (1DPC)
- Robust power and thermal design: 32 power stages with two 8-pin power connectors for the CPU, massive VRM cooling, chipset and M.2 heatsinks with active fans, and M.2 thermal pad.
- PCIe Q-release Slim: Remove the graphics card by directly pulling it up, instead of pressing a PCIe latch.
What the announcement does—and does not—show
The 2011 coverage documents Joyent’s release, its intended cloud-operator audience, and the company’s technical positioning. It is not a benchmark study, and the available sources do not establish comparative speed, security, uptime, or utilization results. A historical utilization comparison repeated in SmartOS documentation is not clearly dated there, so it should not be treated as a current or general industry benchmark.
For a present-day point of reference, the Joyent/Triton downloads page, checked September 30, 2026, presents SmartOS as a downloadable converged container and VM hypervisor and links to a latest build. That listing alone does not establish the build’s date, support level, or hardware compatibility.
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