HP 124708-001 - ProLiant Cluster - 1850 Manual de introducción - Página 16

Navegue en línea o descargue pdf Manual de introducción para Escritorio HP 124708-001 - ProLiant Cluster - 1850. HP 124708-001 - ProLiant Cluster - 1850 22 páginas. Proliant essentials foundation pack installation guide
También para HP 124708-001 - ProLiant Cluster - 1850: Manual de aplicación (35 páginas), Manual de prevención de errores (12 páginas), Libro Blanco técnico (12 páginas), Actualización del firmware (9 páginas), Visión general (20 páginas), Manual de aplicación (26 páginas), Manual de solución de problemas (18 páginas), Manual de aplicación (11 páginas), Manual de instalación (2 páginas)

Intel Microarchitecture Nehalem

Figure 10.

Intel

QuickPath Technology

Intel QuickPath Technology maximizes data transfer between the processors and other system

components. It replaces the multi-drop front-side bus and memory controller hub found in previous

generation architectures with high-speed, point-to-point interconnects that directly link the processors

and I/O chipset (Figure 11). Each QPI consists of two unidirectional links that operate simultaneously

in each direction using differential signaling. Unlike a typical serial bus, the QPI transmits data

packets in parallel across multiple lanes, and the packets are broken into multiple parallel transfers.

Each link is comprised of twenty 1-bit lanes. A maximum of 16 bits (2 bytes) are used to transfer data

and the remaining 4 bits are used for the protocol and error correction. Initially, the QPI performs a

maximum of 6.4 gigatransfers per second (GT/s) with 2 bytes per transfer, or 12.8-GB/s in each

direction for a total theoretical bandwidth of 25.6 GB/s.

Reliability, Availability, and Serviceability (RAS features) of the QPI include self-healing links and

clock fail-over. Each link has twenty 1-bit lanes that are grouped into quadrants with 5 lanes each. If

a persistent (hard) error occurs in one quadrant, the link automatically reduces its width to half (2

quadrants) or quarter-width (1 quadrant) using only the good lanes. This self-healing capability allows

the interconnect to recover from multiple hard errors without data loss. Unrecoverable soft errors

initiate a dynamic link width reduction cycle. If the clock fails, the link is reduced to half- or quarter-

width and the clock is mapped to a pre-determined data lane. The bandwidth of the link in RAS mode

is reduced; however, the link in the other direction can still operate normally.