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InfiniBand Cable and Port Types

QSFP QSFP cables and ports are used to DDR (20 Gbps), QDR (40 Gbps), and FDR (56 Gbps) InfiniBand links. QSFP Cable The connector on a QSFP cable is long and narrow. The connector slides into the port. QSFP Port QSFP port are recessed openings. The QSFP cable slides into the port. CX4 CX4 cables […]

What are Machine Check Exceptions (or MCE)?

A machine check exception is an error detected by your system’s processor. There are 2 major types of MCE errors, a notice or warning error, and a fatal exception. The warning will be logged by a “Machine Check Event logged” notice in your system logs, and can be later viewed via some Linux utilities. A […]

Drivers: Distro vs OFED

Like all computer hardware, InfiniBand adapters need drivers in order to be used by the operating system. Most modern Linux distributions provide the kernel drivers, libraries, and support programs needed to have a functioning InfiniBand adapter. While functional, these may not be the best choice in all cases. When a new InfiniBand card, or firmware […]

Disk marked as Foreign or Bad?

Some times when you replace a disk you may find the new disk marked as “Foreign”. The “Foreign” state means the controller has detected a raid signature on this disk from a previous configuration. This will prevent you from using the disk before the foreign state is cleared out. In order to use the disk we […]

InfiniBand Types and Speeds

Since its release, InfiniBand has been made in 5 speeds and has used two types of connectors. FDR FDR InfiniBand provides a 56 Gbps second link. The data encoding for FDR is different from the other InfiniBand speeds: for every 66 bits transmitted 64 bit are data. This is cable 64b/66b encoding. This provides actual […]

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