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The Xserve is a server from Apple for the Mac OS X Serveroperating system. The Xserve works with a Quad Core Processor of the type Intel Xeon Nehalem with 64-bit architecture. In order to transfer the cache data from processor core to core, the processor provides a common level 3 cache for the four processor cores. The processor cores are connected via Quick Path Interconnect (QPI). Therefore, data transferred from one core to another does not have to pass through an I/O hub.

Instead of separate I/O controllers to connect system memory to a processor, the Intel Xeon Nehalem offers an integrated memory controller to connect memory directly to the processor, which the manufacturer says reduces latency by up to 40 percent.

The Xserver has the Turbo Boost feature, which automatically increases or decreases the processor clock depending on the processing load. Hyperthreading allows two threads to be processed simultaneously on one core.

The Xserve interfaces

On the front, the Xserve has a USB interface, USB 2.0, for connecting a keyboard, mouse or an external storage device. Under a cover are two independent 10/100/1000BASE-T, Gigabit Ethernet, RJ-45 Ethernet interfaces, two FireWire 800 ports, two USB 2.0 ports with 480 Mbit/s each and a serial DB-9 interface, RS-232. A redundant power supply with hot-swap and load sharing is optionally available, a decisive prerequisite for the industrial suitability of a computer as a process control system with high availability.

Xserve from Apple

Xserve from Apple

For memory expansion, three independent hot-plug drive bays for Serial ATA (SATA) or drives with SAS interfaces are available, allowing internal memory of up to 3 TB to be installed. Software for RAID 0 and RAID 1 is also included as standard with the Mac OS X Server operating system.

The Xserve buses

Xserve has two x16 Wide PCI Express 2.0 expansion slots that don't require bandwidth sharing between them, and supports I/O cards such as 10 Gigabit Ethernet or 4GB Fibre Channel. For rendering or video editing with Mac OS X Server's Podcast Producer, a built-in Nvidia GeForce graphics card and 2D/3D acceleration tools come standard. An active cooling system allows automatic adjustment of fan speeds. Each fan has two rotating blades that are independently controlled by temperature sensors.

The Xserve is suitable for file sharing and printer sharing and directory services, for mail and calendar services or for distributed computing with Xgrid 2. For web hosting,Apache, Secure Socket Layer (SSL) and Transport Layer Security (TLS), Hypertext Preprocessor (PHP) and MySQL are supported. The high availability of the server is achieved with features such as automatic recovery, file system journaling or IPfailover.

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Englisch: Xserve
Updated at: 01.11.2013
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Translations: DE